using patched tiagomeol/go-clipboard/clipboard, fixes #37

fine tuning, added test, which hangs, but yanking works anyway
fix-import
2025-12-18 21:11:03 +01:00 · 2025-01-28 14:40:17 +01:00 · 2025-01-23 13:59:02 +01:00 · 2025-01-22 23:15:12 +01:00 · 2025-01-22 23:12:42 +01:00 · 2025-01-21 18:42:04 +01:00
43 changed files with 1404 additions and 900 deletions
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -7,7 +7,7 @@ assignees: TLINDEN

 ---

-**Describtion**
+**Description**
 <!-- Please provide a clear and concise description of the issue: -->


--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@@ -7,7 +7,7 @@ assignees: TLINDEN

 ---

-**Describtion**
+**Description**
 <!-- Please provide a clear and concise description of the feature you desire: -->


--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+        interval: "monthly"
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -4,19 +4,21 @@ jobs:
  build:
    strategy:
      matrix:
-        version: [1.18, 1.19]
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        version: ['1.22']
+        # windows-latest removed, see:
+        # https://github.com/rogpeppe/go-internal/issues/284
+        os: [ubuntu-latest, macos-latest]
    name: Build
    runs-on: ${{ matrix.os }}
    steps:
-    - name: Set up Go 1.18
-      uses: actions/setup-go@v3
+    - name: Set up Go ${{ matrix.version }}
+      uses: actions/setup-go@v5
      with:
-        go-version: ${{ matrix.version }}
+        go-version: '${{ matrix.version }}'
      id: go

    - name: checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4

    - name: build
      run: make
@@ -28,11 +30,11 @@ jobs:
    name: lint
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v5
        with:
-          go-version: 1.18
-      - uses: actions/checkout@v3
+          go-version: 1.22
+      - uses: actions/checkout@v4
      - name: golangci-lint
-        uses: golangci/golangci-lint-action@v3
+        uses: golangci/golangci-lint-action@v6
        with:
          skip-cache: true
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -0,0 +1,32 @@
+name: build-and-test
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  release:
+    name: Build Release Assets
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.22.11
+
+      - name: Build the executables
+        run: ./mkrel.sh tablizer ${{ github.ref_name}}
+
+      - name: List the executables
+        run: ls -l ./releases
+
+      - name: Upload the binaries
+        uses: svenstaro/upload-release-action@v2
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          tag: ${{ github.ref_name }}
+          file: ./releases/*
+          file_glob: true
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 releases
 tablizer
+*.out
--- a/10
+++ b/10
@@ -53,8 +53,7 @@ buildlocal:
 	go build -ldflags "-X 'github.com/tlinden/tablizer/cfg.VERSION=$(VERSION)'"

 release:
-	./mkrel.sh $(tool) $(version)
-	gh release create $(version) --generate-notes releases/*
+	gh release create $(version) --generate-notes

 install: buildlocal
 	install -d -o $(UID) -g $(GID) $(PREFIX)/bin
@@ -66,12 +65,11 @@ clean:
 	rm -rf $(tool) releases coverage.out

 test:
-	go test -v ./...
-	bash t/test.sh
+	go test ./... $(OPTS)

 singletest:
-	@echo "Call like this: ''make singletest TEST=TestPrepareColumns MOD=lib"
-	go test -run $(TEST) github.com/tlinden/tablizer/$(MOD)
+	@echo "Call like this: 'make singletest TEST=TestPrepareColumns MOD=lib'"
+	go test -run $(TEST) github.com/tlinden/tablizer/$(MOD) $(OPTS)

 cover-report:
 	go test ./... -cover -coverprofile=coverage.out
--- a/README.md
+++ b/README.md
@@ -8,6 +8,51 @@ Tablizer  can   be  used   to  re-format   tabular  output   of  other
 programs. While you  could do this using standard unix  tools, in some
 cases it's a hard job.

+Usage:
+```default
+Usage:
+  tablizer [regex] [file, ...] [flags]
+
+Operational Flags:
+  -c, --columns string              Only show the speficied columns (separated by ,)
+  -v, --invert-match                select non-matching rows
+  -n, --no-numbering                Disable header numbering
+  -N, --no-color                    Disable pattern highlighting
+  -H, --no-headers                  Disable headers display
+  -s, --separator string            Custom field separator
+  -k, --sort-by int                 Sort by column (default: 1)
+  -z, --fuzzy                       Use fuzzy search [experimental]
+  -F, --filter field=reg            Filter given field with regex, can be used multiple times
+  -T, --transpose-columns string    Transpose the speficied columns (separated by ,)
+  -R, --regex-transposer /from/to/  Apply /search/replace/ regexp to fields given in -T
+
+Output Flags (mutually exclusive):
+  -X, --extended                    Enable extended output
+  -M, --markdown                    Enable markdown table output
+  -O, --orgtbl                      Enable org-mode table output
+  -S, --shell                       Enable shell evaluable output
+  -Y, --yaml                        Enable yaml output
+  -C, --csv                         Enable CSV output
+  -A, --ascii                       Default output mode, ascii tabular
+  -L, --hightlight-lines            Use alternating background colors for tables
+  -y, --yank-columns                Yank specified columns (separated by ,) to clipboard,
+                                    space separated
+
+Sort Mode Flags (mutually exclusive):
+  -a, --sort-age                    sort according to age (duration) string
+  -D, --sort-desc                   Sort in descending order (default: ascending)
+  -i, --sort-numeric                sort according to string numerical value
+  -t, --sort-time                   sort according to time string
+
+Other Flags:
+      --completion <shell>         Generate the autocompletion script for <shell>
+  -f, --config <file>              Configuration file (default: ~/.config/tablizer/config)
+  -d, --debug                      Enable debugging
+  -h, --help                       help for tablizer
+  -m, --man                        Display manual page
+  -V, --version                    Print program version
+```
+
 Let's take this output:
 ```
 % kubectl get pods -o wide
@@ -83,6 +128,23 @@ otherwise on all rows.

 There are more output modes like org-mode (orgtbl) and markdown.

+You can also use it to modify certain cells using regular expression
+matching. For example:
+
+```shell
+kubectl get pods | tablizer -n -T4 -R '/ /-/'
+NAME                            READY   STATUS  RESTARTS        AGE
+repldepl-7bcd8d5b64-7zq4l       1/1     Running 1-(69m-ago)     5h26m
+repldepl-7bcd8d5b64-m48n8       1/1     Running 1-(69m-ago)     5h26m
+repldepl-7bcd8d5b64-q2bf4       1/1     Running 1-(69m-ago)     5h26m
+```
+
+Here, we modified the 4th column (`-T4`) by replacing every space with
+a dash. If you need to work with `/` characters, you can also use any
+other separator, for instance: `-R '| |-|'`.
+
+
+
 ## Demo

 [![asciicast](demo/tablizer-demo.gif)](https://asciinema.org/a/9FKc3HPnlg8D2X8otheleEa9t)
@@ -138,6 +200,41 @@ In order to report a bug, unexpected behavior, feature requests
 or to submit a patch, please open an issue on github:
 https://github.com/TLINDEN/tablizer/issues.

+## Prior Art
+
+When I started with tablizer I was not aware that other tools
+exist. Here is a non-exhausive list of the ones I find especially
+awesome:
+
+### [miller](https://github.com/johnkerl/miller)
+
+This is a really powerful tool to work with tabular data and it also
+allows other inputs as json, csv etc. You can filter, manipulate,
+create pipelines, there's even a programming language builtin to do
+even more amazing things.
+
+### [csvq](https://github.com/mithrandie/csvq)
+
+Csvq allows you to query CSV and TSV data using SQL queries. How nice
+is that? Highly recommended if you have to work with a large (and
+wide) dataset and need to apply a complicated set of rules.
+
+### [goawk](https://github.com/benhoyt/goawk)
+
+Goawk is a 100% POSIX compliant AWK implementation in GO, which also
+supports CSV and TSV data as input (using `-i csv` for example). You
+can apply any kind of awk code to your tabular data, there are no
+limit to your creativity!
+
+### [teip](https://github.com/greymd/teip)
+
+I particularly like teip, it's a real gem. You can use it to drill
+"holes" into your tabular data and modify these "holes" using small
+external unix commands such as grep or sed. The possibilities are
+endless, you can even use teip to modify data inside a hole created by
+teip. Highly recommended.
+
+
 ## Copyright and license

 This software is licensed under the GNU GENERAL PUBLIC LICENSE version 3.
--- a/TODO.md
+++ b/TODO.md
@@ -6,13 +6,3 @@

 - add --no-headers option

-### Lisp Plugin Infrastructure using zygo
-
-Hooks:
-
-| Filter    | Purpose                                                     | Args                | Return |
-|-----------|-------------------------------------------------------------|---------------------|--------|
-| filter    | include or exclude lines                                    | row as hash         | bool   |
-| process   | do calculations with data, store results in global lisp env | whole dataset       | nil    |
-| transpose | modify a cell                                               | headername and cell | cell   |
-| append    | add one or more rows to the dataset (use this to add stats) | nil                 | rows   |
--- a/cfg/config.go
+++ b/cfg/config.go
@@ -23,16 +23,14 @@ import (
 	"regexp"
 	"strings"

-	"github.com/glycerine/zygomys/zygo"
 	"github.com/gookit/color"
 	"github.com/hashicorp/hcl/v2/hclsimple"
 )

 const DefaultSeparator string = `(\s\s+|\t)`
-const Version string = "v1.2.0"
+const Version string = "v1.3.1"
 const MAXPARTS = 2

-var DefaultLoadPath = os.Getenv("HOME") + "/.config/tablizer/lisp"
 var DefaultConfigfile = os.Getenv("HOME") + "/.config/tablizer/config"

 var VERSION string // maintained by -x
@@ -49,6 +47,11 @@ type Settings struct {
 	HighlightHdrBG string `hcl:"HighlightHdrBG"`
 }

+type Transposer struct {
+	Search  regexp.Regexp
+	Replace string
+}
+
 // internal config
 type Config struct {
 	Debug          bool
@@ -56,6 +59,8 @@ type Config struct {
 	NoHeaders      bool
 	Columns        string
 	UseColumns     []int
+	YankColumns    string
+	UseYankColumns []int
 	Separator      string
 	OutputMode     int
 	InvertMatch    bool
@@ -64,9 +69,15 @@ type Config struct {
 	UseFuzzySearch bool
 	UseHighlight   bool

-	SortMode       string
-	SortDescending bool
-	SortByColumn   int
+	SortMode        string
+	SortDescending  bool
+	SortByColumn    string // 1,2
+	UseSortByColumn []int  // []int{1,2}
+
+	TransposeColumns    string       // 1,2
+	UseTransposeColumns []int        // []int{1,2}
+	Transposers         []string     // []string{"/ /-/", "/foo/bar/"}
+	UseTransposers      []Transposer // {Search: re, Replace: string}

 	/*
 	 FIXME: make configurable somehow, config file or ENV
@@ -79,13 +90,6 @@ type Config struct {

 	NoColor bool

-	// special  case: we use the  config struct to transport  the lisp
-	// env trough the program
-	Lisp *zygo.Zlisp
-
-	// a path containing lisp scripts to be loaded on startup
-	LispLoadPath string
-
 	// config file, optional
 	Configfile string

@@ -94,6 +98,9 @@ type Config struct {
 	// used for field filtering
 	Rawfilters []string
 	Filters    map[string]*regexp.Regexp
+
+	// -r <file>
+	InputFile string
 }

 // maps outputmode short flags to output mode, ie. -O => -o orgtbl
@@ -125,9 +132,6 @@ type Sortmode struct {
 	Age     bool
 }

-// valid lisp hooks
-var ValidHooks []string
-
 // default color schemes
 func (conf *Config) Colors() map[color.Level]map[string]color.Color {
 	colors := map[color.Level]map[string]color.Color{
@@ -277,7 +281,30 @@ func (conf *Config) PrepareFilters() error {
 				parts[0], err)
 		}

-		conf.Filters[strings.ToLower(parts[0])] = reg
+		conf.Filters[strings.ToLower(strings.ToLower(parts[0]))] = reg
+	}
+
+	return nil
+}
+
+// check if transposers match transposer columns and prepare transposer structs
+func (conf *Config) PrepareTransposers() error {
+	if len(conf.Transposers) != len(conf.UseTransposeColumns) {
+		return fmt.Errorf("the number of transposers needs to correspond to the number of transpose columns: %d != %d",
+			len(conf.Transposers), len(conf.UseTransposeColumns))
+	}
+
+	for _, transposer := range conf.Transposers {
+		parts := strings.Split(transposer, string(transposer[0]))
+		if len(parts) != 4 {
+			return fmt.Errorf("transposer function must have the format /regexp/replace-string/")
+		}
+
+		conf.UseTransposers = append(conf.UseTransposers,
+			Transposer{
+				Search:  *regexp.MustCompile(parts[1]),
+				Replace: parts[2]},
+		)
 	}

 	return nil
@@ -306,8 +333,6 @@ func (conf *Config) ApplyDefaults() {
 	if conf.OutputMode == Yaml || conf.OutputMode == CSV {
 		conf.NoNumbering = true
 	}
-
-	ValidHooks = []string{"filter", "process", "transpose", "append"}
 }

 func (conf *Config) PreparePattern(pattern string) error {
@@ -328,7 +353,16 @@ func (conf *Config) PreparePattern(pattern string) error {
 func (conf *Config) ParseConfigfile() error {
 	path, err := os.Stat(conf.Configfile)

-	if os.IsNotExist(err) || path.IsDir() {
+	if err != nil {
+		if os.IsNotExist(err) {
+			// ignore non-existent files
+			return nil
+		}
+
+		return fmt.Errorf("failed to stat config file: %w", err)
+	}
+
+	if path.IsDir() {
 		// ignore non-existent or dirs
 		return nil
 	}
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -63,6 +63,14 @@ func completion(cmd *cobra.Command, mode string) error {
 	}
 }

+// we die with exit 1 if there's an error
+func wrapE(err error) {
+	if err != nil {
+		fmt.Println(err.Error())
+		os.Exit(1)
+	}
+}
+
 func Execute() {
 	var (
 		conf           cfg.Config
@@ -77,48 +85,40 @@ func Execute() {
 		Use:   "tablizer [regex] [file, ...]",
 		Short: "[Re-]tabularize tabular data",
 		Long:  `Manipulate tabular output of other programs`,
-		RunE: func(cmd *cobra.Command, args []string) error {
+
+		Run: func(cmd *cobra.Command, args []string) {
 			if ShowVersion {
 				fmt.Println(cfg.Getversion())

-				return nil
+				return
 			}

 			if ShowManual {
 				man()

-				return nil
+				return
 			}

 			if len(ShowCompletion) > 0 {
-				return completion(cmd, ShowCompletion)
+				wrapE(completion(cmd, ShowCompletion))
+
+				return
 			}

 			// Setup
-			err := conf.ParseConfigfile()
-			if err != nil {
-				return err
-			}
+			wrapE(conf.ParseConfigfile())

 			conf.CheckEnv()
 			conf.PrepareModeFlags(modeflag)
 			conf.PrepareSortFlags(sortmode)

-			if err = conf.PrepareFilters(); err != nil {
-				return err
-			}
+			wrapE(conf.PrepareFilters())

 			conf.DetermineColormode()
 			conf.ApplyDefaults()

-			// setup lisp env, load plugins etc
-			err = lib.SetupLisp(&conf)
-			if err != nil {
-				return err
-			}
-
 			// actual execution starts here
-			return lib.ProcessFiles(&conf, args)
+			wrapE(lib.ProcessFiles(&conf, args))
 		},
 	}

@@ -147,9 +147,13 @@ func Execute() {
 		"Custom field separator")
 	rootCmd.PersistentFlags().StringVarP(&conf.Columns, "columns", "c", "",
 		"Only show the speficied columns (separated by ,)")
+	rootCmd.PersistentFlags().StringVarP(&conf.YankColumns, "yank-columns", "y", "",
+		"Yank the speficied columns (separated by ,) to the clipboard")
+	rootCmd.PersistentFlags().StringVarP(&conf.TransposeColumns, "transpose-columns", "T", "",
+		"Transpose the speficied columns (separated by ,)")

 	// sort options
-	rootCmd.PersistentFlags().IntVarP(&conf.SortByColumn, "sort-by", "k", 0,
+	rootCmd.PersistentFlags().StringVarP(&conf.SortByColumn, "sort-by", "k", "",
 		"Sort by column (default: 1)")

 	// sort mode, only 1 allowed
@@ -182,16 +186,19 @@ func Execute() {
 	rootCmd.MarkFlagsMutuallyExclusive("extended", "markdown", "orgtbl",
 		"shell", "yaml", "csv")

-	// lisp options
-	rootCmd.PersistentFlags().StringVarP(&conf.LispLoadPath, "load-path", "l", cfg.DefaultLoadPath,
-		"Load path for lisp plugins (expects *.zy files)")
-
 	// config file
 	rootCmd.PersistentFlags().StringVarP(&conf.Configfile, "config", "f", cfg.DefaultConfigfile,
 		"config file (default: ~/.config/tablizer/config)")

 	// filters
-	rootCmd.PersistentFlags().StringArrayVarP(&conf.Rawfilters, "filter", "F", nil, "Filter by field (field=regexp)")
+	rootCmd.PersistentFlags().StringArrayVarP(&conf.Rawfilters,
+		"filter", "F", nil, "Filter by field (field=regexp)")
+	rootCmd.PersistentFlags().StringArrayVarP(&conf.Transposers,
+		"regex-transposer", "R", nil, "apply /search/replace/ regexp to fields given in -T")
+
+	// input
+	rootCmd.PersistentFlags().StringVarP(&conf.InputFile, "read-file", "r", "",
+		"Read input data from file")

 	rootCmd.SetUsageTemplate(strings.TrimSpace(usage) + "\n")

--- a/cmd/tablizer.go
+++ b/cmd/tablizer.go
@@ -9,39 +9,43 @@ SYNOPSIS
          tablizer [regex] [file, ...] [flags]
    
        Operational Flags:
-          -c, --columns string     Only show the speficied columns (separated by ,)
-          -v, --invert-match       select non-matching rows
-          -n, --no-numbering       Disable header numbering
-          -N, --no-color           Disable pattern highlighting
-          -H, --no-headers         Disable headers display
-          -s, --separator string   Custom field separator
-          -k, --sort-by int        Sort by column (default: 1)
-          -z, --fuzzy              Use fuzzy search [experimental]
-          -F, --filter field=reg   Filter given field with regex, can be used multiple times
+          -c, --columns string              Only show the speficied columns (separated by ,)
+          -v, --invert-match                select non-matching rows
+          -n, --no-numbering                Disable header numbering
+          -N, --no-color                    Disable pattern highlighting
+          -H, --no-headers                  Disable headers display
+          -s, --separator string            Custom field separator
+          -k, --sort-by int|name            Sort by column (default: 1)
+          -z, --fuzzy                       Use fuzzy search [experimental]
+          -F, --filter field=reg            Filter given field with regex, can be used multiple times
+          -T, --transpose-columns string    Transpose the speficied columns (separated by ,)
+          -R, --regex-transposer /from/to/  Apply /search/replace/ regexp to fields given in -T

        Output Flags (mutually exclusive):
-          -X, --extended           Enable extended output
-          -M, --markdown           Enable markdown table output
-          -O, --orgtbl             Enable org-mode table output
-          -S, --shell              Enable shell evaluable output
-          -Y, --yaml               Enable yaml output
-          -C, --csv                Enable CSV output
-          -A, --ascii              Default output mode, ascii tabular
-          -L, --hightlight-lines   Use alternating background colors for tables
+          -X, --extended                    Enable extended output
+          -M, --markdown                    Enable markdown table output
+          -O, --orgtbl                      Enable org-mode table output
+          -S, --shell                       Enable shell evaluable output
+          -Y, --yaml                        Enable yaml output
+          -C, --csv                         Enable CSV output
+          -A, --ascii                       Default output mode, ascii tabular
+          -L, --hightlight-lines            Use alternating background colors for tables
+          -y, --yank-columns                Yank specified columns (separated by ,) to clipboard,
+                                            space separated

        Sort Mode Flags (mutually exclusive):
-          -a, --sort-age           sort according to age (duration) string
-          -D, --sort-desc          Sort in descending order (default: ascending)
-          -i, --sort-numeric       sort according to string numerical value
-          -t, --sort-time          sort according to time string
+          -a, --sort-age                    sort according to age (duration) string
+          -D, --sort-desc                   Sort in descending order (default: ascending)
+          -i, --sort-numeric                sort according to string numerical value
+          -t, --sort-time                   sort according to time string

        Other Flags:
-              --completion <shell> Generate the autocompletion script for <shell>
-          -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
-          -d, --debug              Enable debugging
-          -h, --help               help for tablizer
-          -m, --man                Display manual page
-          -V, --version            Print program version
+              --completion <shell>         Generate the autocompletion script for <shell>
+          -f, --config <file>              Configuration file (default: ~/.config/tablizer/config)
+          -d, --debug                      Enable debugging
+          -h, --help                       help for tablizer
+          -m, --man                        Display manual page
+          -V, --version                    Print program version

 DESCRIPTION
    Many programs generate tabular output. But sometimes you need to
@@ -101,10 +105,19 @@ DESCRIPTION
    highlighted. You can disable this behavior with the -N option.

    Use the -k option to specify by which column to sort the tabular data
-    (as in GNU sort(1)). The default sort column is the first one. To
-    disable sorting at all, supply 0 (Zero) to -k. The default sort order is
-    ascending. You can change this to descending order using the option -D.
-    The default sort order is by string, but there are other sort modes:
+    (as in GNU sort(1)). The default sort column is the first one. You can
+    specify column numbers or names. Column numbers start with 1, names are
+    case insensitive. You can specify multiple columns separated by comma to
+    sort, but the type must be the same. For example if you want to sort
+    numerically, all columns must be numbers. If you use column numbers,
+    then be aware, that these are the numbers before column extraction. For
+    example if you have a table with 4 columns and specify "-c4", then only
+    1 column (the fourth) will be printed, however if you want to sort by
+    this column, you'll have to specify "-k4".
+
+    The default sort order is ascending. You can change this to descending
+    order using the option -D. The default sort order is by alphanumeric
+    string, but there are other sort modes:

    -a --sort-age
        Sorts duration strings like "1d4h32m51s".
@@ -185,6 +198,44 @@ DESCRIPTION

    where "C" is our regexp which matches CMD.

+    If a column specifier doesn't look like a regular expression, matching
+    against header fields will be case insensitive. So, if you have a field
+    with the name "ID" then these will all match: "-c id", "-c Id". The same
+    rule applies to the options "-T" and "-F".
+
+  TRANSPOSE FIELDS USING REGEXPS
+    You can manipulate field contents using regular expressions. You have to
+    tell tablizer which field[s] to operate on using the option "-T" and the
+    search/replace pattern using "-R". The number of columns and patterns
+    must match.
+
+    A search/replace pattern consists of the following elements:
+
+        /search-regexp/replace-string/
+
+    The separator can be any valid character. Especially if you want to use
+    a regexp containing the "/" character, eg:
+
+        |search-regexp|replace-string|
+
+    Example:
+
+        cat t/testtable2
+        NAME  DURATION
+        x     10
+        a     100
+        z     0
+        u     4
+        k     6
+    
+        cat t/testtable2 | tablizer -T2 -R '/^\d/4/' -n
+        NAME    DURATION 
+        x       40      
+        a       400     
+        z       4       
+        u       4       
+        k       4
+
  OUTPUT MODES
    There might be cases when the tabular output of a program is way too
    large for your current terminal but you still need to see every column.
@@ -218,6 +269,18 @@ DESCRIPTION
    markdown which prints a Markdown table, yaml, which prints yaml encoding
    and CSV mode, which prints a comma separated value file.

+  PUT FIELDS TO CLIPBOARD
+    You can let tablizer put fields to the clipboard using the option "-y".
+    This best fits the use-case when the result of your filtering yields
+    just one row. For example:
+
+        cloudctl cluster ls | tablizer -yid matchbox
+
+    If "matchbox" matches one cluster, you can immediately use the id of
+    that cluster somewhere else and paste it. Of course, if there are
+    multiple matches, then all id's will be put into the clipboard separated
+    by one space.
+
  ENVIRONMENT VARIABLES
    tablizer supports certain environment variables which use can use to
    influence program behavior. Commandline flags have always precedence
@@ -346,39 +409,43 @@ Usage:
  tablizer [regex] [file, ...] [flags]

 Operational Flags:
-  -c, --columns string     Only show the speficied columns (separated by ,)
-  -v, --invert-match       select non-matching rows
-  -n, --no-numbering       Disable header numbering
-  -N, --no-color           Disable pattern highlighting
-  -H, --no-headers         Disable headers display
-  -s, --separator string   Custom field separator
-  -k, --sort-by int        Sort by column (default: 1)
-  -z, --fuzzy              Use fuzzy search [experimental]
-  -F, --filter field=reg   Filter given field with regex, can be used multiple times
+  -c, --columns string              Only show the speficied columns (separated by ,)
+  -v, --invert-match                select non-matching rows
+  -n, --no-numbering                Disable header numbering
+  -N, --no-color                    Disable pattern highlighting
+  -H, --no-headers                  Disable headers display
+  -s, --separator string            Custom field separator
+  -k, --sort-by int|name            Sort by column (default: 1)
+  -z, --fuzzy                       Use fuzzy search [experimental]
+  -F, --filter field=reg            Filter given field with regex, can be used multiple times
+  -T, --transpose-columns string    Transpose the speficied columns (separated by ,)
+  -R, --regex-transposer /from/to/  Apply /search/replace/ regexp to fields given in -T

 Output Flags (mutually exclusive):
-  -X, --extended           Enable extended output
-  -M, --markdown           Enable markdown table output
-  -O, --orgtbl             Enable org-mode table output
-  -S, --shell              Enable shell evaluable output
-  -Y, --yaml               Enable yaml output
-  -C, --csv                Enable CSV output
-  -A, --ascii              Default output mode, ascii tabular
-  -L, --hightlight-lines   Use alternating background colors for tables
+  -X, --extended                    Enable extended output
+  -M, --markdown                    Enable markdown table output
+  -O, --orgtbl                      Enable org-mode table output
+  -S, --shell                       Enable shell evaluable output
+  -Y, --yaml                        Enable yaml output
+  -C, --csv                         Enable CSV output
+  -A, --ascii                       Default output mode, ascii tabular
+  -L, --hightlight-lines            Use alternating background colors for tables
+  -y, --yank-columns                Yank specified columns (separated by ,) to clipboard,
+                                    space separated

 Sort Mode Flags (mutually exclusive):
-  -a, --sort-age           sort according to age (duration) string
-  -D, --sort-desc          Sort in descending order (default: ascending)
-  -i, --sort-numeric       sort according to string numerical value
-  -t, --sort-time          sort according to time string
+  -a, --sort-age                    sort according to age (duration) string
+  -D, --sort-desc                   Sort in descending order (default: ascending)
+  -i, --sort-numeric                sort according to string numerical value
+  -t, --sort-time                   sort according to time string

 Other Flags:
-      --completion <shell> Generate the autocompletion script for <shell>
-  -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
-  -d, --debug              Enable debugging
-  -h, --help               help for tablizer
-  -m, --man                Display manual page
-  -V, --version            Print program version
+      --completion <shell>         Generate the autocompletion script for <shell>
+  -f, --config <file>              Configuration file (default: ~/.config/tablizer/config)
+  -d, --debug                      Enable debugging
+  -h, --help                       help for tablizer
+  -m, --man                        Display manual page
+  -V, --version                    Print program version


 `
--- a/go.mod
+++ b/go.mod
@@ -1,43 +1,37 @@
 module github.com/tlinden/tablizer

-go 1.18
+go 1.22

 require (
-	github.com/alecthomas/repr v0.1.1
+	github.com/alecthomas/repr v0.4.0
 	github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de
-	github.com/glycerine/zygomys v5.1.2+incompatible
-	github.com/gookit/color v1.5.2
-	github.com/hashicorp/hcl/v2 v2.19.1
-	github.com/lithammer/fuzzysearch v1.1.7
+	github.com/atotto/clipboard v0.1.4
+	github.com/gookit/color v1.5.4
+	github.com/hashicorp/hcl/v2 v2.23.0
+	github.com/lithammer/fuzzysearch v1.1.8
 	github.com/olekukonko/tablewriter v0.0.5
-	github.com/spf13/cobra v1.6.1
+	github.com/rogpeppe/go-internal v1.13.1
+	github.com/spf13/cobra v1.8.1
 	gopkg.in/yaml.v3 v3.0.1
 )

 require (
-	github.com/agext/levenshtein v1.2.1 // indirect
+	github.com/agext/levenshtein v1.2.3 // indirect
 	github.com/apparentlymart/go-textseg/v13 v13.0.0 // indirect
 	github.com/apparentlymart/go-textseg/v15 v15.0.0 // indirect
-	github.com/glycerine/blake2b v0.0.0-20151022103502-3c8c640cd7be // indirect
-	github.com/glycerine/goconvey v0.0.0-20190410193231-58a59202ab31 // indirect
-	github.com/glycerine/greenpack v5.1.1+incompatible // indirect
-	github.com/glycerine/liner v0.0.0-20160121172638-72909af234e0 // indirect
-	github.com/google/go-cmp v0.5.6 // indirect
-	github.com/gopherjs/gopherjs v1.17.2 // indirect
-	github.com/inconshreveable/mousetrap v1.0.1 // indirect
-	github.com/jtolds/gls v4.20.0+incompatible // indirect
-	github.com/mattn/go-runewidth v0.0.10 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
 	github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 // indirect
-	github.com/philhofer/fwd v1.1.2 // indirect
-	github.com/rivo/uniseg v0.1.0 // indirect
-	github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636 // indirect
-	github.com/shurcooL/go-goon v1.0.0 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/rivo/uniseg v0.2.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/tinylib/msgp v1.1.9 // indirect
-	github.com/ugorji/go/codec v1.2.11 // indirect
-	github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 // indirect
-	github.com/zclconf/go-cty v1.13.0 // indirect
-	golang.org/x/sys v0.13.0 // indirect
+	github.com/tiagomelo/go-clipboard v0.1.2-0.20250126153310-fcc1f95408cf // indirect
+	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
+	github.com/zclconf/go-cty v1.13.3 // indirect
+	golang.org/x/mod v0.18.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.21.0 // indirect
 	golang.org/x/text v0.11.0 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	golang.org/x/tools v0.22.0 // indirect
 )
--- a/go.sum
+++ b/go.sum
@@ -1,88 +1,77 @@
-github.com/agext/levenshtein v1.2.1 h1:QmvMAjj2aEICytGiWzmxoE0x2KZvE0fvmqMOfy2tjT8=
-github.com/agext/levenshtein v1.2.1/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki2W0IB5558=
-github.com/alecthomas/repr v0.1.1 h1:87P60cSmareLAxMc4Hro0r2RBY4ROm0dYwkJNpS4pPs=
-github.com/alecthomas/repr v0.1.1/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
+github.com/agext/levenshtein v1.2.3 h1:YB2fHEn0UJagG8T1rrWknE3ZQzWM06O8AMAatNn7lmo=
+github.com/agext/levenshtein v1.2.3/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki2W0IB5558=
+github.com/alecthomas/repr v0.4.0 h1:GhI2A8MACjfegCPVq9f1FLvIBS+DrQ2KQBFZP1iFzXc=
+github.com/alecthomas/repr v0.4.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/apparentlymart/go-textseg/v13 v13.0.0 h1:Y+KvPE1NYz0xl601PVImeQfFyEy6iT90AvPUL1NNfNw=
 github.com/apparentlymart/go-textseg/v13 v13.0.0/go.mod h1:ZK2fH7c4NqDTLtiYLvIkEghdlcqw7yxLeM89kiTRPUo=
 github.com/apparentlymart/go-textseg/v15 v15.0.0 h1:uYvfpb3DyLSCGWnctWKGj857c6ew1u1fNQOlOtuGxQY=
 github.com/apparentlymart/go-textseg/v15 v15.0.0/go.mod h1:K8XmNZdhEBkdlyDdvbmmsvpAG721bKi0joRfFdHIWJ4=
 github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de h1:FxWPpzIjnTlhPwqqXc4/vE0f7GvRjuAsbW+HOIe8KnA=
 github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de/go.mod h1:DCaWoUhZrYW9p1lxo/cm8EmUOOzAPSEZNGF2DK1dJgw=
-github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
+github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
+github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/glycerine/blake2b v0.0.0-20151022103502-3c8c640cd7be h1:XBJdPGgA3qqhW+p9CANCAVdF7ZIXdu3pZAkypMkKAjE=
-github.com/glycerine/blake2b v0.0.0-20151022103502-3c8c640cd7be/go.mod h1:OSCrScrFAjcBObrulk6BEQlytA462OkG1UGB5NYj9kE=
-github.com/glycerine/goconvey v0.0.0-20190410193231-58a59202ab31 h1:gclg6gY70GLy3PbkQ1AERPfmLMMagS60DKF78eWwLn8=
-github.com/glycerine/goconvey v0.0.0-20190410193231-58a59202ab31/go.mod h1:Ogl1Tioa0aV7gstGFO7KhffUsb9M4ydbEbbxpcEDc24=
-github.com/glycerine/greenpack v5.1.1+incompatible h1:fDr9i6MkSGZmAy4VXPfJhW+SyK2/LNnzIp5nHyDiaIM=
-github.com/glycerine/greenpack v5.1.1+incompatible/go.mod h1:us0jVISAESGjsEuLlAfCd5nkZm6W6WQF18HPuOecIg4=
-github.com/glycerine/liner v0.0.0-20160121172638-72909af234e0 h1:4ZegphJXBTc4uFQ08UVoWYmQXorGa+ipXetUj83sMBc=
-github.com/glycerine/liner v0.0.0-20160121172638-72909af234e0/go.mod h1:AqJLs6UeoC65dnHxyCQ6MO31P5STpjcmgaANAU+No8Q=
-github.com/glycerine/zygomys v5.1.2+incompatible h1:jmcdmA3XPxgfOunAXFpipE9LQoUL6eX6d2mhYyjV4GE=
-github.com/glycerine/zygomys v5.1.2+incompatible/go.mod h1:i3SPKZpmy9dwF/3iWrXJ/ZLyzZucegwypwOmqRkUUaQ=
 github.com/go-test/deep v1.0.3 h1:ZrJSEWsXzPOxaZnFteGEfooLba+ju3FYIbOrS+rQd68=
-github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
-github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/gookit/color v1.5.2 h1:uLnfXcaFjlrDnQDT+NCBcfhrXqYTx/rcCa6xn01Y8yI=
-github.com/gookit/color v1.5.2/go.mod h1:w8h4bGiHeeBpvQVePTutdbERIUf3oJE5lZ8HM0UgXyg=
-github.com/gopherjs/gopherjs v1.17.2 h1:fQnZVsXk8uxXIStYb0N4bGk7jeyTalG/wsZjQ25dO0g=
-github.com/gopherjs/gopherjs v1.17.2/go.mod h1:pRRIvn/QzFLrKfvEz3qUuEhtE/zLCWfreZ6J5gM2i+k=
-github.com/hashicorp/hcl/v2 v2.19.1 h1://i05Jqznmb2EXqa39Nsvyan2o5XyMowW5fnCKW5RPI=
-github.com/hashicorp/hcl/v2 v2.19.1/go.mod h1:ThLC89FV4p9MPW804KVbe/cEXoQ8NZEh+JtMeeGErHE=
-github.com/inconshreveable/mousetrap v1.0.1 h1:U3uMjPSQEBMNp1lFxmllqCPM6P5u/Xq7Pgzkat/bFNc=
-github.com/inconshreveable/mousetrap v1.0.1/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
-github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
-github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
-github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
-github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
-github.com/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348 h1:MtvEpTB6LX3vkb4ax0b5D2DHbNAUsen0Gx5wZoq3lV4=
-github.com/lithammer/fuzzysearch v1.1.7 h1:q8rZNmBIUkqxsxb/IlwsXVbCoPIH/0juxjFHY0UIwhU=
-github.com/lithammer/fuzzysearch v1.1.7/go.mod h1:ZhIlfRGxnD8qa9car/yplC6GmnM14CS07BYAKJJBK2I=
+github.com/go-test/deep v1.0.3/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/gookit/color v1.5.4 h1:FZmqs7XOyGgCAxmWyPslpiok1k05wmY3SJTytgvYFs0=
+github.com/gookit/color v1.5.4/go.mod h1:pZJOeOS8DM43rXbp4AZo1n9zCU2qjpcRko0b6/QJi9w=
+github.com/hashicorp/hcl/v2 v2.23.0 h1:Fphj1/gCylPxHutVSEOf2fBOh1VE4AuLV7+kbJf3qos=
+github.com/hashicorp/hcl/v2 v2.23.0/go.mod h1:62ZYHrXgPoX8xBnzl8QzbWq4dyDsDtfCRgIq1rbJEvA=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/lithammer/fuzzysearch v1.1.8 h1:/HIuJnjHuXS8bKaiTMeeDlW2/AyIWk2brx1V8LFgLN4=
+github.com/lithammer/fuzzysearch v1.1.8/go.mod h1:IdqeyBClc3FFqSzYq/MXESsS4S0FsZ5ajtkr5xPLts4=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
-github.com/mattn/go-runewidth v0.0.10 h1:CoZ3S2P7pvtP45xOtBw+/mDL2z0RKI576gSkzRRpdGg=
 github.com/mattn/go-runewidth v0.0.10/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
+github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
+github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 h1:DpOJ2HYzCv8LZP15IdmG+YdwD2luVPHITV96TkirNBM=
 github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUbP2oI0UX1GXzOo=
 github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N7AbDhec=
 github.com/olekukonko/tablewriter v0.0.5/go.mod h1:hPp6KlRPjbx+hW8ykQs1w3UBbZlj6HuIJcUGPhkA7kY=
-github.com/philhofer/fwd v1.1.2 h1:bnDivRJ1EWPjUIRXV5KfORO897HTbpFAQddBdE8t7Gw=
-github.com/philhofer/fwd v1.1.2/go.mod h1:qkPdfjR2SIEbspLqpe1tO4n5yICnr2DY7mqEx2tUTP0=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/rivo/uniseg v0.1.0 h1:+2KBaVoUmb9XzDsrx/Ct0W/EYOSFf/nWTauy++DprtY=
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
+github.com/rogpeppe/go-internal v1.13.1/go.mod h1:uMEvuHeurkdAXX61udpOXGD/AzZDWNMNyH2VO9fmH0o=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/scylladb/termtables v0.0.0-20191203121021-c4c0b6d42ff4/go.mod h1:C1a7PQSMz9NShzorzCiG2fk9+xuCgLkPeCvMHYR2OWg=
-github.com/sergi/go-diff v1.0.0 h1:Kpca3qRNrduNnOQeazBd0ysaKrUJiIuISHxogkT9RPQ=
-github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636 h1:aSISeOcal5irEhJd1M+IrApc0PdcN7e7Aj4yuEnOrfQ=
-github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636/go.mod h1:TDJrrUr11Vxrven61rcy3hJMUqaf/CLWYhHNPmT14Lk=
-github.com/shurcooL/go-goon v1.0.0 h1:BCQPvxGkHHJ4WpBO4m/9FXbITVIsvAm/T66cCcCGI7E=
-github.com/shurcooL/go-goon v1.0.0/go.mod h1:2wTHMsGo7qnpmqA8ADYZtP4I1DD94JpXGQ3Dxq2YQ5w=
-github.com/spf13/cobra v1.6.1 h1:o94oiPyS4KD1mPy2fmcYYHHfCxLqYjJOhGsCHFZtEzA=
-github.com/spf13/cobra v1.6.1/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
+github.com/spf13/cobra v1.8.1 h1:e5/vxKd/rZsfSJMUX1agtjeTDf+qv1/JdBF8gg5k9ZM=
+github.com/spf13/cobra v1.8.1/go.mod h1:wHxEcudfqmLYa8iTfL+OuZPbBZkmvliBWKIezN3kD9Y=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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-github.com/tinylib/msgp v1.1.9/go.mod h1:BCXGB54lDD8qUEPmiG0cQQUANC4IUQyB2ItS2UDlO/k=
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-github.com/ugorji/go/codec v1.2.11/go.mod h1:UNopzCgEMSXjBc6AOMqYvWC1ktqTAfzJZUZgYf6w6lg=
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+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/tiagomelo/go-clipboard v0.1.1 h1:nddQ5DsEnKW0KdzTILhbLpSq3e9y2dkJXEOtsMs6H7A=
+github.com/tiagomelo/go-clipboard v0.1.1/go.mod h1:kXtjJBIMimZaGbxmcKZ8+JqK+acSNf5tAJiChlZBOr8=
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+github.com/tiagomelo/go-clipboard v0.1.2-0.20250126153310-fcc1f95408cf/go.mod h1:kXtjJBIMimZaGbxmcKZ8+JqK+acSNf5tAJiChlZBOr8=
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 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
-github.com/zclconf/go-cty v1.13.0 h1:It5dfKTTZHe9aeppbNOda3mN7Ag7sg6QkBNm6TkyFa0=
-github.com/zclconf/go-cty v1.13.0/go.mod h1:YKQzy/7pZ7iq2jNFzy5go57xdxdWoLLpaEp4u238AE0=
+github.com/zclconf/go-cty v1.13.3 h1:m+b9q3YDbg6Bec5rr+KGy1MzEVzY/jC2X+YX4yqKtHI=
+github.com/zclconf/go-cty v1.13.3/go.mod h1:YKQzy/7pZ7iq2jNFzy5go57xdxdWoLLpaEp4u238AE0=
+github.com/zclconf/go-cty-debug v0.0.0-20240509010212-0d6042c53940 h1:4r45xpDWB6ZMSMNJFMOjqrGHynW3DIBuR2H9j0ug+Mo=
+github.com/zclconf/go-cty-debug v0.0.0-20240509010212-0d6042c53940/go.mod h1:CmBdvvj3nqzfzJ6nTCIwDTPZ56aVGvDrmztiO5g3qrM=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561 h1:MDc5xs78ZrZr3HMQugiXOAkSZtfTpbJLDr/lwfgO53E=
+golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/mod v0.18.0 h1:5+9lSbEzPSdWkH32vYPBwEpX8KwDbM52Ud9xBUvNlb0=
+golang.org/x/mod v0.18.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
@@ -90,15 +79,16 @@ golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
+golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
-golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
+golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
@@ -106,17 +96,16 @@ golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
-golang.org/x/text v0.8.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
+golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.11.0 h1:LAntKIrcmeSKERyiOh0XMV39LXS8IE9UL2yP7+f5ij4=
 golang.org/x/text v0.11.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/tools v0.22.0 h1:gqSGLZqv+AI9lIQzniJ0nZDRG5GBPsSi+DRNHWNz6yA=
+golang.org/x/tools v0.22.0/go.mod h1:aCwcsjqvq7Yqt6TNyX7QMU2enbQ/Gt0bo6krSeEri+c=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
--- a/lib/filter.go
+++ b/lib/filter.go
@@ -19,7 +19,6 @@ package lib

 import (
 	"bufio"
-	"fmt"
 	"io"
 	"strings"

@@ -44,10 +43,10 @@ func matchPattern(conf cfg.Config, line string) bool {
 * more filters match on a row, it  will be kept, otherwise it will be
 * excluded.
 */
-func FilterByFields(conf cfg.Config, data Tabdata) (Tabdata, bool, error) {
+func FilterByFields(conf cfg.Config, data *Tabdata) (*Tabdata, bool, error) {
 	if len(conf.Filters) == 0 {
 		// no filters, no checking
-		return Tabdata{}, false, nil
+		return nil, false, nil
 	}

 	newdata := data.CloneEmpty()
@@ -75,7 +74,44 @@ func FilterByFields(conf cfg.Config, data Tabdata) (Tabdata, bool, error) {
 		}
 	}

-	return newdata, true, nil
+	return &newdata, true, nil
+}
+
+/*
+ * Transpose fields using search/replace regexp.
+ */
+func TransposeFields(conf cfg.Config, data *Tabdata) (*Tabdata, bool, error) {
+	if len(conf.UseTransposers) == 0 {
+		// nothing to be done
+		return nil, false, nil
+	}
+
+	newdata := data.CloneEmpty()
+	transposed := false
+
+	for _, row := range data.entries {
+		transposedrow := false
+
+		for idx := range data.headers {
+			transposeidx, hasone := findindex(conf.UseTransposeColumns, idx+1)
+			if hasone {
+				row[idx] =
+					conf.UseTransposers[transposeidx].Search.ReplaceAllString(
+						row[idx],
+						conf.UseTransposers[transposeidx].Replace,
+					)
+				transposedrow = true
+			}
+		}
+
+		if transposedrow {
+			// also apply -v
+			newdata.entries = append(newdata.entries, row)
+			transposed = true
+		}
+	}
+
+	return &newdata, transposed, nil
 }

 /* generic map.Exists(key) */
@@ -107,18 +143,6 @@ func FilterByPattern(conf cfg.Config, input io.Reader) (io.Reader, error) {
 				// so we ignore all lines, which DO match.
 				continue
 			}
-
-			// apply user defined lisp filters, if any
-			accept, err := RunFilterHooks(conf, line)
-			if err != nil {
-				return input, fmt.Errorf("failed to apply filter hook: %w", err)
-			}
-
-			if !accept {
-				//  IF there  are filter  hook[s] and  IF one  of them
-				// returns false on the current line, reject it
-				continue
-			}
 		}

 		lines = append(lines, line)
--- a/lib/filter_test.go
+++ b/lib/filter_test.go
@@ -153,8 +153,8 @@ func TestFilterByFields(t *testing.T) {
 				t.Errorf("PrepareFilters returned error: %s", err)
 			}

-			data, _, _ := FilterByFields(conf, data)
-			if !reflect.DeepEqual(data, inputdata.expect) {
+			data, _, _ := FilterByFields(conf, &data)
+			if !reflect.DeepEqual(*data, inputdata.expect) {
 				t.Errorf("Filtered data does not match expected data:\ngot: %+v\nexp: %+v", data, inputdata.expect)
 			}
 		})
--- a/lib/helpers.go
+++ b/lib/helpers.go
@@ -40,32 +40,127 @@ func contains(s []int, e int) bool {
 	return false
 }

-// parse columns list given  with -c, modifies config.UseColumns based
-// on eventually given regex
-func PrepareColumns(conf *cfg.Config, data *Tabdata) error {
-	if conf.Columns == "" {
-		return nil
+func findindex(s []int, e int) (int, bool) {
+	for i, a := range s {
+		if a == e {
+			return i, true
+		}
 	}

-	for _, use := range strings.Split(conf.Columns, ",") {
-		if len(use) == 0 {
-			return fmt.Errorf("could not parse columns list %s: empty column", conf.Columns)
+	return 0, false
+}
+
+// validate the consitency of parsed data
+func ValidateConsistency(data *Tabdata) error {
+	expectedfields := len(data.headers)
+
+	for idx, row := range data.entries {
+		if len(row) != expectedfields {
+			return fmt.Errorf("row %d does not contain expected %d elements, but %d",
+				idx, expectedfields, len(row))
+		}
+	}
+
+	return nil
+}
+
+// parse columns list given  with -c, modifies config.UseColumns based
+// on eventually given regex.
+// This is an output filter, because -cN,N,... is being applied AFTER
+// processing of the input data.
+func PrepareColumns(conf *cfg.Config, data *Tabdata) error {
+	// -c columns
+	usecolumns, err := PrepareColumnVars(conf.Columns, data)
+	if err != nil {
+		return err
+	}
+
+	conf.UseColumns = usecolumns
+
+	// -y columns
+	useyankcolumns, err := PrepareColumnVars(conf.YankColumns, data)
+	if err != nil {
+		return err
+	}
+
+	conf.UseYankColumns = useyankcolumns
+
+	return nil
+}
+
+// Same thing as above but for -T option, which is an input option,
+// because transposers are being applied before output.
+func PrepareTransposerColumns(conf *cfg.Config, data *Tabdata) error {
+	// -T columns
+	usetransposecolumns, err := PrepareColumnVars(conf.TransposeColumns, data)
+	if err != nil {
+		return err
+	}
+
+	conf.UseTransposeColumns = usetransposecolumns
+
+	// verify that columns and transposers match and prepare transposer structs
+	if err := conf.PrepareTransposers(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// output option, prepare -k1,2 sort fields
+func PrepareSortColumns(conf *cfg.Config, data *Tabdata) error {
+	// -c columns
+	usecolumns, err := PrepareColumnVars(conf.SortByColumn, data)
+	if err != nil {
+		return err
+	}
+
+	conf.UseSortByColumn = usecolumns
+
+	return nil
+}
+
+func PrepareColumnVars(columns string, data *Tabdata) ([]int, error) {
+	if columns == "" {
+		return nil, nil
+	}
+
+	usecolumns := []int{}
+
+	isregex := regexp.MustCompile(`\W`)
+
+	for _, columnpattern := range strings.Split(columns, ",") {
+		if len(columnpattern) == 0 {
+			return nil, fmt.Errorf("could not parse columns list %s: empty column", columns)
 		}

-		usenum, err := strconv.Atoi(use)
+		usenum, err := strconv.Atoi(columnpattern)
 		if err != nil {
-			// might be a regexp
-			colPattern, err := regexp.Compile(use)
-			if err != nil {
-				msg := fmt.Sprintf("Could not parse columns list %s: %v", conf.Columns, err)
+			// not a number

-				return errors.New(msg)
-			}
+			if !isregex.MatchString(columnpattern) {
+				// is not a regexp (contains no non-word chars)
+				// lc() it so that word searches are case insensitive
+				columnpattern = strings.ToLower(columnpattern)

-			// find matching header fields
-			for i, head := range data.headers {
-				if colPattern.MatchString(head) {
-					conf.UseColumns = append(conf.UseColumns, i+1)
+				for i, head := range data.headers {
+					if columnpattern == strings.ToLower(head) {
+						usecolumns = append(usecolumns, i+1)
+					}
+				}
+			} else {
+				colPattern, err := regexp.Compile("(?i)" + columnpattern)
+				if err != nil {
+					msg := fmt.Sprintf("Could not parse columns list %s: %v", columns, err)
+
+					return nil, errors.New(msg)
+				}
+
+				// find matching header fields, ignoring case
+				for i, head := range data.headers {
+					if colPattern.MatchString(strings.ToLower(head)) {
+						usecolumns = append(usecolumns, i+1)
+					}
 				}
 			}
 		} else {
@@ -73,27 +168,28 @@ func PrepareColumns(conf *cfg.Config, data *Tabdata) error {
 			// a colum spec is not a number, we process them above
 			// inside the err handler  for atoi(). so only add the
 			// number, if it's really just a number.
-			conf.UseColumns = append(conf.UseColumns, usenum)
+			usecolumns = append(usecolumns, usenum)
 		}
 	}

 	// deduplicate: put all values into a map (value gets map key)
 	// thereby  removing duplicates,  extract keys into  new slice
 	// and sort it
-	imap := make(map[int]int, len(conf.UseColumns))
-	for _, i := range conf.UseColumns {
+	imap := make(map[int]int, len(usecolumns))
+	for _, i := range usecolumns {
 		imap[i] = 0
 	}

-	conf.UseColumns = nil
+	// fill with deduplicated columns
+	usecolumns = nil

 	for k := range imap {
-		conf.UseColumns = append(conf.UseColumns, k)
+		usecolumns = append(usecolumns, k)
 	}

-	sort.Ints(conf.UseColumns)
+	sort.Ints(usecolumns)

-	return nil
+	return usecolumns, nil
 }

 // prepare headers: add numbers to headers
--- a/lib/helpers_test.go
+++ b/lib/helpers_test.go
@@ -67,8 +67,8 @@ func TestPrepareColumns(t *testing.T) {
 	}{
 		{"1,2,3", []int{1, 2, 3}, false},
 		{"1,2,", []int{}, true},
-		{"T", []int{2, 3}, false},
-		{"T,2,3", []int{2, 3}, false},
+		{"T.", []int{2, 3}, false},
+		{"T.,2,3", []int{2, 3}, false},
 		{"[a-z,4,5", []int{4, 5}, true}, // invalid regexp
 	}

@@ -90,6 +90,86 @@ func TestPrepareColumns(t *testing.T) {
 	}
 }

+func TestPrepareTransposerColumns(t *testing.T) {
+	data := Tabdata{
+		maxwidthHeader: 5,
+		columns:        3,
+		headers: []string{
+			"ONE", "TWO", "THREE",
+		},
+		entries: [][]string{
+			{
+				"2", "3", "4",
+			},
+		},
+	}
+
+	var tests = []struct {
+		input     string
+		transp    []string
+		exp       int
+		wanterror bool // expect error
+	}{
+		{
+			"1",
+			[]string{`/\d/x/`},
+			1,
+			false,
+		},
+		{
+			"T.", // will match [T]WO and [T]HREE
+			[]string{`/\d/x/`, `/.//`},
+			2,
+			false,
+		},
+		{
+			"TH.,2",
+			[]string{`/\d/x/`, `/.//`},
+			2,
+			false,
+		},
+		{
+			"1",
+			[]string{},
+			1,
+			true,
+		},
+		{
+			"",
+			[]string{`|.|N|`},
+			0,
+			true,
+		},
+		{
+			"1",
+			[]string{`|.|N|`},
+			1,
+			false,
+		},
+	}
+
+	for _, testdata := range tests {
+		testname := fmt.Sprintf("PrepareTransposerColumns-%s-%t", testdata.input, testdata.wanterror)
+		t.Run(testname, func(t *testing.T) {
+			conf := cfg.Config{TransposeColumns: testdata.input, Transposers: testdata.transp}
+			err := PrepareTransposerColumns(&conf, &data)
+			if err != nil {
+				if !testdata.wanterror {
+					t.Errorf("got error: %v", err)
+				}
+			} else {
+				if len(conf.UseTransposeColumns) != testdata.exp {
+					t.Errorf("got %d, want %d", conf.UseTransposeColumns, testdata.exp)
+				}
+
+				if len(conf.Transposers) != len(conf.UseTransposeColumns) {
+					t.Errorf("got %d, want %d", conf.UseTransposeColumns, testdata.exp)
+				}
+			}
+		})
+	}
+}
+
 func TestReduceColumns(t *testing.T) {
 	var tests = []struct {
 		expect  [][]string
--- a/lib/io.go
+++ b/lib/io.go
@@ -29,7 +29,7 @@ import (
 const RWRR = 0755

 func ProcessFiles(conf *cfg.Config, args []string) error {
-	fds, pattern, err := determineIO(conf, args)
+	fd, pattern, err := determineIO(conf, args)

 	if err != nil {
 		return err
@@ -39,76 +39,67 @@ func ProcessFiles(conf *cfg.Config, args []string) error {
 		return err
 	}

-	for _, fd := range fds {
-		data, err := Parse(*conf, fd)
-		if err != nil {
-			return err
-		}
-
-		err = PrepareColumns(conf, &data)
-		if err != nil {
-			return err
-		}
-
-		printData(os.Stdout, *conf, &data)
+	data, err := Parse(*conf, fd)
+	if err != nil {
+		return err
 	}

+	if err = ValidateConsistency(&data); err != nil {
+		return err
+	}
+
+	err = PrepareSortColumns(conf, &data)
+	if err != nil {
+		return err
+	}
+
+	err = PrepareColumns(conf, &data)
+	if err != nil {
+		return err
+	}
+
+	printData(os.Stdout, *conf, &data)
+
 	return nil
 }

-func determineIO(conf *cfg.Config, args []string) ([]io.Reader, string, error) {
-	var filehandles []io.Reader
-
+func determineIO(conf *cfg.Config, args []string) (io.Reader, string, error) {
+	var filehandle io.Reader
 	var pattern string
-
 	var haveio bool

-	stat, _ := os.Stdin.Stat()
-	if (stat.Mode() & os.ModeCharDevice) == 0 {
-		// we're reading from STDIN, which takes precedence over file args
-		filehandles = append(filehandles, os.Stdin)
-
-		if len(args) > 0 {
-			// ignore any args > 1
-			pattern = args[0]
-			conf.Pattern = args[0] // used for colorization by printData()
-		}
-
+	switch {
+	case conf.InputFile == "-":
+		filehandle = os.Stdin
 		haveio = true
-	} else if len(args) > 0 {
-		// threre were args left, take a look
-		if args[0] == "-" {
-			// in traditional unix programs a dash denotes STDIN (forced)
-			filehandles = append(filehandles, os.Stdin)
-			haveio = true
-		} else {
-			if _, err := os.Stat(args[0]); err != nil {
-				// first  one is  not a  file, consider  it as  regexp and
-				// shift arg list
-				pattern = args[0]
-				conf.Pattern = args[0] // used for colorization by printData()
-				args = args[1:]
-			}
+	case conf.InputFile != "":
+		fd, err := os.OpenFile(conf.InputFile, os.O_RDONLY, RWRR)

-			if len(args) > 0 {
-				// consider any other args as files
-				for _, file := range args {
-					filehandle, err := os.OpenFile(file, os.O_RDONLY, RWRR)
-
-					if err != nil {
-						return nil, "", fmt.Errorf("failed to read input file %s: %w", file, err)
-					}
-
-					filehandles = append(filehandles, filehandle)
-					haveio = true
-				}
-			}
+		if err != nil {
+			return nil, "", fmt.Errorf("failed to read input file %s: %w", conf.InputFile, err)
 		}
+
+		filehandle = fd
+		haveio = true
+	}
+
+	if !haveio {
+		stat, _ := os.Stdin.Stat()
+		if (stat.Mode() & os.ModeCharDevice) == 0 {
+			// we're reading from STDIN, which takes precedence over file args
+			filehandle = os.Stdin
+			haveio = true
+		}
+	}
+
+	if len(args) > 0 {
+		pattern = args[0]
+		conf.Pattern = args[0]
 	}

 	if !haveio {
 		return nil, "", errors.New("no file specified and nothing to read on stdin")
 	}

-	return filehandles, pattern, nil
+	return filehandle, pattern, nil
 }
--- a/lib/lisp.go
+++ b/lib/lisp.go
@@ -1,313 +0,0 @@
-/*
-Copyright © 2023 Thomas von Dein
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-package lib
-
-import (
-	"errors"
-	"fmt"
-	"log"
-	"os"
-	"strings"
-
-	"github.com/glycerine/zygomys/zygo"
-	"github.com/tlinden/tablizer/cfg"
-)
-
-/*
-needs to be global because we can't feed an cfg object to AddHook()
-which is being called from user lisp code
-*/
-var Hooks map[string][]*zygo.SexpSymbol
-
-/*
-AddHook() (called addhook from lisp code)  can be used by the user to
-add a function to one of the available hooks provided by tablizer.
-*/
-func AddHook(env *zygo.Zlisp, name string, args []zygo.Sexp) (zygo.Sexp, error) {
-	var hookname string
-
-	if len(args) < 2 {
-		return zygo.SexpNull, errors.New("argument of %add-hook should be: %hook-name %your-function")
-	}
-
-	switch sexptype := args[0].(type) {
-	case *zygo.SexpSymbol:
-		if !HookExists(sexptype.Name()) {
-			return zygo.SexpNull, errors.New("Unknown hook " + sexptype.Name())
-		}
-
-		hookname = sexptype.Name()
-
-	default:
-		return zygo.SexpNull, errors.New("hook name must be a symbol ")
-	}
-
-	switch sexptype := args[1].(type) {
-	case *zygo.SexpSymbol:
-		_, exists := Hooks[hookname]
-		if !exists {
-			Hooks[hookname] = []*zygo.SexpSymbol{sexptype}
-		} else {
-			Hooks[hookname] = append(Hooks[hookname], sexptype)
-		}
-
-	default:
-		return zygo.SexpNull, errors.New("hook function must be a symbol ")
-	}
-
-	return zygo.SexpNull, nil
-}
-
-/*
-Check if a hook exists
-*/
-func HookExists(key string) bool {
-	for _, hook := range cfg.ValidHooks {
-		if hook == key {
-			return true
-		}
-	}
-
-	return false
-}
-
-/*
- * Basic sanity checks and load lisp file
- */
-func LoadAndEvalFile(env *zygo.Zlisp, path string) error {
-	if strings.HasSuffix(path, `.zy`) {
-		code, err := os.ReadFile(path)
-		if err != nil {
-			return fmt.Errorf("failed to read lisp file %s: %w", path, err)
-		}
-
-		// FIXME: check what res (_ here) could be and mean
-		_, err = env.EvalString(string(code))
-		if err != nil {
-			log.Fatalf(env.GetStackTrace(err))
-		}
-	}
-
-	return nil
-}
-
-/*
- * Setup lisp interpreter environment
- */
-func SetupLisp(conf *cfg.Config) error {
-	// iterate over load-path and evaluate all *.zy files there, if any
-	// we ignore if load-path does not exist, which is the default anyway
-	path, err := os.Stat(conf.LispLoadPath)
-	if os.IsNotExist(err) {
-		return nil
-	}
-
-	// init global hooks
-	Hooks = make(map[string][]*zygo.SexpSymbol)
-
-	// init sandbox
-	env := zygo.NewZlispSandbox()
-	env.AddFunction("addhook", AddHook)
-
-	if !path.IsDir() {
-		// load single lisp file
-		err = LoadAndEvalFile(env, conf.LispLoadPath)
-		if err != nil {
-			return err
-		}
-	} else {
-		// load all lisp file in load dir
-		dir, err := os.ReadDir(conf.LispLoadPath)
-		if err != nil {
-			return fmt.Errorf("failed to read lisp dir %s: %w",
-				conf.LispLoadPath, err)
-		}
-
-		for _, entry := range dir {
-			if !entry.IsDir() {
-				err := LoadAndEvalFile(env, conf.LispLoadPath+"/"+entry.Name())
-				if err != nil {
-					return err
-				}
-			}
-		}
-	}
-
-	RegisterLib(env)
-
-	conf.Lisp = env
-
-	return nil
-}
-
-/*
-Execute every user lisp function registered as filter hook.
-
-Each function is given the current line as argument and is expected to
-return a boolean.   True indicates to keep the line,  false to skip
-it.
-
-If there  are multiple such  functions registered, then the  first one
-returning false wins,  that is if each function returns  true the line
-will  be kept,  if at  least one  of them  returns false,  it will  be
-skipped.
-*/
-func RunFilterHooks(conf cfg.Config, line string) (bool, error) {
-	for _, hook := range Hooks["filter"] {
-		var result bool
-
-		conf.Lisp.Clear()
-
-		res, err := conf.Lisp.EvalString(fmt.Sprintf("(%s `%s`)", hook.Name(), line))
-		if err != nil {
-			return false, fmt.Errorf("failed to evaluate hook loader: %w", err)
-		}
-
-		switch sexptype := res.(type) {
-		case *zygo.SexpBool:
-			result = sexptype.Val
-		default:
-			return false, fmt.Errorf("filter hook shall return bool")
-		}
-
-		if !result {
-			// the first hook which returns false leads to complete false
-			return result, nil
-		}
-	}
-
-	// if no hook returned false, we succeed and accept the given line
-	return true, nil
-}
-
-/*
-These hooks get the data (Tabdata) readily processed by tablizer as
-argument. They are expected to  return a SexpPair containing a boolean
-denoting  if  the data  has  been  modified  and the  actual  modified
-data. Columns must  be the same, rows may differ.  Cells may also have
-been modified.
-
-Replaces the  internal data structure  Tabdata with the  user supplied
-version.
-
-Only one process hook function is supported.
-
-The somewhat complicated code is being  caused by the fact, that we
-need to convert our internal structure  to a lisp variable and vice
-versa afterwards.
-*/
-func RunProcessHooks(conf cfg.Config, data Tabdata) (Tabdata, bool, error) {
-	var userdata Tabdata
-
-	lisplist := []zygo.Sexp{}
-
-	if len(Hooks["process"]) == 0 {
-		return userdata, false, nil
-	}
-
-	if len(Hooks["process"]) > 1 {
-		fmt.Println("Warning: only one process hook is allowed!")
-	}
-
-	// there are hook[s] installed, convert the go data structure 'data to lisp
-	for _, row := range data.entries {
-		var entry zygo.SexpHash
-
-		for idx, cell := range row {
-			err := entry.HashSet(&zygo.SexpStr{S: data.headers[idx]}, &zygo.SexpStr{S: cell})
-			if err != nil {
-				return userdata, false, fmt.Errorf("failed to convert to lisp data: %w", err)
-			}
-		}
-
-		lisplist = append(lisplist, &entry)
-	}
-
-	// we need to add it to the env so that the function can use the struct directly
-	conf.Lisp.AddGlobal("data", &zygo.SexpArray{Val: lisplist, Env: conf.Lisp})
-
-	// execute the actual hook
-	hook := Hooks["process"][0]
-
-	conf.Lisp.Clear()
-
-	var result bool
-
-	res, err := conf.Lisp.EvalString(fmt.Sprintf("(%s data)", hook.Name()))
-	if err != nil {
-		return userdata, false, fmt.Errorf("failed to eval lisp loader: %w", err)
-	}
-
-	// we expect (bool, array(hash)) as return from the function
-	switch sexptype := res.(type) {
-	case *zygo.SexpPair:
-		switch th := sexptype.Head.(type) {
-		case *zygo.SexpBool:
-			result = th.Val
-		default:
-			return userdata, false, errors.New("xpect (bool, array(hash)) as return value")
-		}
-
-		switch sexptailtype := sexptype.Tail.(type) {
-		case *zygo.SexpArray:
-			lisplist = sexptailtype.Val
-		default:
-			return userdata, false, errors.New("expect (bool, array(hash)) as return value ")
-		}
-	default:
-		return userdata, false, errors.New("filter hook shall return array of hashes ")
-	}
-
-	if !result {
-		// no further processing required
-		return userdata, result, nil
-	}
-
-	// finally convert lispdata back to Tabdata
-	for _, item := range lisplist {
-		row := []string{}
-
-		switch hash := item.(type) {
-		case *zygo.SexpHash:
-			for _, header := range data.headers {
-				entry, err := hash.HashGetDefault(
-					conf.Lisp,
-					&zygo.SexpStr{S: header},
-					&zygo.SexpStr{S: ""})
-				if err != nil {
-					return userdata, false, fmt.Errorf("failed to get lisp hash entry: %w", err)
-				}
-
-				switch sexptype := entry.(type) {
-				case *zygo.SexpStr:
-					row = append(row, sexptype.S)
-				default:
-					return userdata, false, errors.New("hsh values should be string ")
-				}
-			}
-		default:
-			return userdata, false, errors.New("rturned array should contain hashes ")
-		}
-
-		userdata.entries = append(userdata.entries, row)
-	}
-
-	userdata.headers = data.headers
-
-	return userdata, result, nil
-}
--- a/lib/lisplib.go
+++ b/lib/lisplib.go
@@ -1,88 +0,0 @@
-/*
-Copyright © 2023 Thomas von Dein
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-package lib
-
-import (
-	"errors"
-	"fmt"
-	"regexp"
-	"strconv"
-
-	"github.com/glycerine/zygomys/zygo"
-)
-
-func Splice2SexpList(list []string) zygo.Sexp {
-	slist := []zygo.Sexp{}
-
-	for _, item := range list {
-		slist = append(slist, &zygo.SexpStr{S: item})
-	}
-
-	return zygo.MakeList(slist)
-}
-
-func StringReSplit(env *zygo.Zlisp, name string, args []zygo.Sexp) (zygo.Sexp, error) {
-	if len(args) < 2 {
-		return zygo.SexpNull, errors.New("expecting 2 arguments")
-	}
-
-	var separator, input string
-
-	switch t := args[0].(type) {
-	case *zygo.SexpStr:
-		input = t.S
-	default:
-		return zygo.SexpNull, errors.New("second argument must be a string")
-	}
-
-	switch t := args[1].(type) {
-	case *zygo.SexpStr:
-		separator = t.S
-	default:
-		return zygo.SexpNull, errors.New("first argument must be a string")
-	}
-
-	sep := regexp.MustCompile(separator)
-
-	return Splice2SexpList(sep.Split(input, -1)), nil
-}
-
-func String2Int(env *zygo.Zlisp, name string, args []zygo.Sexp) (zygo.Sexp, error) {
-	var number int
-
-	switch t := args[0].(type) {
-	case *zygo.SexpStr:
-		num, err := strconv.Atoi(t.S)
-
-		if err != nil {
-			return zygo.SexpNull, fmt.Errorf("failed to convert string to number: %w", err)
-		}
-
-		number = num
-
-	default:
-		return zygo.SexpNull, errors.New("argument must be a string")
-	}
-
-	return &zygo.SexpInt{Val: int64(number)}, nil
-}
-
-func RegisterLib(env *zygo.Zlisp) {
-	env.AddFunction("resplit", StringReSplit)
-	env.AddFunction("atoi", String2Int)
-}
--- a/lib/parser.go
+++ b/lib/parser.go
@@ -33,11 +33,31 @@ import (
 Parser switch
 */
 func Parse(conf cfg.Config, input io.Reader) (Tabdata, error) {
+	var data Tabdata
+	var err error
+
+	// first step, parse the data
 	if len(conf.Separator) == 1 {
-		return parseCSV(conf, input)
+		data, err = parseCSV(conf, input)
+	} else {
+		data, err = parseTabular(conf, input)
 	}

-	return parseTabular(conf, input)
+	if err != nil {
+		return data, err
+	}
+
+	// 2nd step, apply filters, code or transposers, if any
+	postdata, changed, err := PostProcess(conf, &data)
+	if err != nil {
+		return data, err
+	}
+
+	if changed {
+		return *postdata, nil
+	}
+
+	return data, err
 }

 /*
@@ -77,16 +97,6 @@ func parseCSV(conf cfg.Config, input io.Reader) (Tabdata, error) {
 		}
 	}

-	// apply user defined lisp process hooks, if any
-	userdata, changed, err := RunProcessHooks(conf, data)
-	if err != nil {
-		return data, fmt.Errorf("failed to apply filter hook: %w", err)
-	}
-
-	if changed {
-		data = userdata
-	}
-
 	return data, nil
 }

@@ -110,9 +120,6 @@ func parseTabular(conf cfg.Config, input io.Reader) (Tabdata, error) {
 		if !hadFirst {
 			// header processing
 			data.columns = len(parts)
-			// if Debug {
-			// 	fmt.Println(parts)
-			// }

 			// process all header fields
 			for _, part := range parts {
@@ -138,18 +145,6 @@ func parseTabular(conf cfg.Config, input io.Reader) (Tabdata, error) {
 				continue
 			}

-			// apply user defined lisp filters, if any
-			accept, err := RunFilterHooks(conf, line)
-			if err != nil {
-				return data, fmt.Errorf("failed to apply filter hook: %w", err)
-			}
-
-			if !accept {
-				//  IF there  are filter  hook[s] and  IF one  of them
-				// returns false on the current line, reject it
-				continue
-			}
-
 			idx := 0 // we cannot use the header index, because we could exclude columns
 			values := []string{}
 			for _, part := range parts {
@@ -174,29 +169,42 @@ func parseTabular(conf cfg.Config, input io.Reader) (Tabdata, error) {
 		return data, fmt.Errorf("failed to read from io.Reader: %w", scanner.Err())
 	}

+	return data, nil
+}
+
+func PostProcess(conf cfg.Config, data *Tabdata) (*Tabdata, bool, error) {
+	var modified bool
+
 	// filter by field filters, if any
 	filtereddata, changed, err := FilterByFields(conf, data)
 	if err != nil {
-		return data, fmt.Errorf("failed to filter fields: %w", err)
+		return data, false, fmt.Errorf("failed to filter fields: %w", err)
 	}

 	if changed {
 		data = filtereddata
+		modified = true
 	}

-	// apply user defined lisp process hooks, if any
-	userdata, changed, err := RunProcessHooks(conf, data)
+	// check if transposers are valid and turn into Transposer structs
+	if err := PrepareTransposerColumns(&conf, data); err != nil {
+		return data, false, err
+	}
+
+	// transpose if demanded
+	modifieddata, changed, err := TransposeFields(conf, data)
 	if err != nil {
-		return data, fmt.Errorf("failed to apply filter hook: %w", err)
+		return data, false, fmt.Errorf("failed to transpose fields: %w", err)
 	}

 	if changed {
-		data = userdata
+		data = modifieddata
+		modified = true
 	}

 	if conf.Debug {
 		repr.Print(data)
 	}

-	return data, nil
+	return data, modified, nil
 }
--- a/lib/printer.go
+++ b/lib/printer.go
@@ -1,5 +1,5 @@
 /*
-Copyright © 2022 Thomas von Dein
+Copyright © 2022-2025 Thomas von Dein

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -33,15 +33,20 @@ import (
 )

 func printData(writer io.Writer, conf cfg.Config, data *Tabdata) {
-	// add numbers to headers and remove this we're not interested in
+	//  Sort   the  data  first,  before   headers+entries  are  being
+	// reduced. That way the user can specify any valid column to sort
+	// by, independently if it's being used for display or not.
+	sortTable(conf, data)
+
+	// put one or more columns into clipboard
+	yankColumns(conf, data)
+
+	// add numbers to headers and remove those we're not interested in
 	numberizeAndReduceHeaders(conf, data)

 	// remove unwanted columns, if any
 	reduceColumns(conf, data)

-	// sort the data
-	sortTable(conf, data)
-
 	switch conf.OutputMode {
 	case cfg.Extended:
 		printExtendedData(writer, conf, data)
--- a/lib/printer_test.go
+++ b/lib/printer_test.go
@@ -63,7 +63,7 @@ var tests = []struct {
 	name string // so we can identify which one fails, can be the same
 	// for multiple tests, because flags will be appended to the name
 	sortby    string // empty == default
-	column    int    // sort by this column, 0 == default first or NO Sort
+	column    int    // sort by this column (numbers start by 1)
 	desc      bool   // sort in descending order, default == ascending
 	nonum     bool   // hide numbering
 	mode      int    // shell, orgtbl, etc. empty == default: ascii
@@ -162,7 +162,7 @@ DURATION(2): 33d12h

 	//------------------------ SORT TESTS
 	{
-		name:   "sortbycolumn",
+		name:   "sortbycolumn3",
 		column: 3,
 		sortby: "numeric",
 		desc:   false,
@@ -173,7 +173,7 @@ beta   	1d10h5m1s  	33      	3/1/2014
 alpha  	4h35m      	170     	2013-Feb-03`,
 	},
 	{
-		name:   "sortbycolumn",
+		name:   "sortbycolumn4",
 		column: 4,
 		sortby: "time",
 		desc:   false,
@@ -184,7 +184,7 @@ alpha  	4h35m      	170     	2013-Feb-03
 beta   	1d10h5m1s  	33      	3/1/2014`,
 	},
 	{
-		name:   "sortbycolumn",
+		name:   "sortbycolumn2",
 		column: 2,
 		sortby: "duration",
 		desc:   false,
@@ -251,15 +251,14 @@ DURATION(2)	WHEN(4)

 func TestPrinter(t *testing.T) {
 	for _, testdata := range tests {
-		testname := fmt.Sprintf("print-sortcol-%d-desc-%t-sortby-%s-mode-%d-usecolumns-%s",
-			testdata.column, testdata.desc, testdata.sortby, testdata.mode, testdata.usecolstr)
+		testname := fmt.Sprintf("print-%s-%d-desc-%t-sortby-%s-mode-%d-usecolumns-%s",
+			testdata.name, testdata.column, testdata.desc, testdata.sortby, testdata.mode, testdata.usecolstr)
 		t.Run(testname, func(t *testing.T) {
 			// replaces os.Stdout, but we ignore it
 			var writer bytes.Buffer

 			// cmd flags
 			conf := cfg.Config{
-				SortByColumn:   testdata.column,
 				SortDescending: testdata.desc,
 				SortMode:       testdata.sortby,
 				OutputMode:     testdata.mode,
@@ -268,6 +267,10 @@ func TestPrinter(t *testing.T) {
 				NoColor:        true,
 			}

+			if testdata.column > 0 {
+				conf.UseSortByColumn = []int{testdata.column}
+			}
+
 			conf.ApplyDefaults()

 			// the test checks the len!
--- a/lib/sort.go
+++ b/lib/sort.go
@@ -18,6 +18,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package lib

 import (
+	"cmp"
 	"regexp"
 	"sort"
 	"strconv"
@@ -27,34 +28,41 @@ import (
 )

 func sortTable(conf cfg.Config, data *Tabdata) {
-	if conf.SortByColumn <= 0 {
+	if len(conf.UseSortByColumn) == 0 {
 		// no sorting wanted
 		return
 	}

-	// slightly modified here to match internal array indicies
-	col := conf.SortByColumn
-
-	col-- // ui starts counting by 1, but use 0 internally
-
 	// sanity checks
 	if len(data.entries) == 0 {
 		return
 	}

-	if col >= len(data.headers) {
-		// fall back to default column
-		col = 0
-	}
-
 	// actual sorting
 	sort.SliceStable(data.entries, func(i, j int) bool {
-		return compare(&conf, data.entries[i][col], data.entries[j][col])
+		// holds the result of a sort of one column
+		comparators := []int{}
+
+		// iterate over all columns to be sorted, conf.SortMode must be identical!
+		for _, column := range conf.UseSortByColumn {
+			comparators = append(comparators, compare(&conf, data.entries[i][column-1], data.entries[j][column-1]))
+		}
+
+		// return the combined result
+		res := cmp.Or(comparators...)
+
+		switch res {
+		case 0:
+			return true
+		default:
+			return false
+		}
+
 	})
 }

 // config is not modified here, but it would be inefficient to copy it every loop
-func compare(conf *cfg.Config, left string, right string) bool {
+func compare(conf *cfg.Config, left string, right string) int {
 	var comp bool

 	switch conf.SortMode {
@@ -88,7 +96,12 @@ func compare(conf *cfg.Config, left string, right string) bool {
 		comp = !comp
 	}

-	return comp
+	switch comp {
+	case true:
+		return 0
+	default:
+		return 1
+	}
 }

 /*
--- a/lib/sort_test.go
+++ b/lib/sort_test.go
@@ -53,18 +53,18 @@ func TestCompare(t *testing.T) {
 		mode string
 		a    string
 		b    string
-		want bool
+		want int
 		desc bool
 	}{
 		// ascending
-		{"numeric", "10", "20", true, false},
-		{"duration", "2d4h5m", "45m", false, false},
-		{"time", "12/24/2022", "1/1/1970", false, false},
+		{"numeric", "10", "20", 0, false},
+		{"duration", "2d4h5m", "45m", 1, false},
+		{"time", "12/24/2022", "1/1/1970", 1, false},

 		// descending
-		{"numeric", "10", "20", false, true},
-		{"duration", "2d4h5m", "45m", true, true},
-		{"time", "12/24/2022", "1/1/1970", true, true},
+		{"numeric", "10", "20", 1, true},
+		{"duration", "2d4h5m", "45m", 0, true},
+		{"time", "12/24/2022", "1/1/1970", 0, true},
 	}

 	for _, testdata := range tests {
@@ -75,7 +75,7 @@ func TestCompare(t *testing.T) {
 			c := cfg.Config{SortMode: testdata.mode, SortDescending: testdata.desc}
 			got := compare(&c, testdata.a, testdata.b)
 			if got != testdata.want {
-				t.Errorf("got %t, want %t", got, testdata.want)
+				t.Errorf("got %d, want %d", got, testdata.want)
 			}
 		})
 	}
--- a/lib/yank.go
+++ b/lib/yank.go
@@ -0,0 +1,51 @@
+/*
+Copyright © 2022-2025 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package lib
+
+import (
+	"log"
+	"strings"
+
+	"github.com/tiagomelo/go-clipboard/clipboard"
+	"github.com/tlinden/tablizer/cfg"
+)
+
+func yankColumns(conf cfg.Config, data *Tabdata) {
+	var yank []string
+
+	if len(data.entries) == 0 || len(conf.UseYankColumns) == 0 {
+		return
+	}
+
+	for _, row := range data.entries {
+		for i, field := range row {
+			for _, idx := range conf.UseYankColumns {
+				if i == idx-1 {
+					yank = append(yank, field)
+				}
+			}
+		}
+	}
+
+	if len(yank) > 0 {
+		cb := clipboard.New(clipboard.ClipboardOptions{Primary: true})
+		if err := cb.CopyText(strings.Join(yank, " ")); err != nil {
+			log.Fatalln("error writing string to clipboard:", err)
+		}
+	}
+}
--- a/lib/yank_test.go
+++ b/lib/yank_test.go
@@ -0,0 +1,72 @@
+/*
+Copyright © 2025 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package lib
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+
+	"github.com/tiagomelo/go-clipboard/clipboard"
+	"github.com/tlinden/tablizer/cfg"
+)
+
+var yanktests = []struct {
+	name   string
+	yank   []int // -y$colum,$column... after processing
+	filter string
+	expect string
+}{
+	{
+		name:   "one",
+		yank:   []int{1},
+		filter: "beta",
+	},
+}
+
+func DISABLED_TestYankColumns(t *testing.T) {
+	cb := clipboard.New()
+
+	for _, testdata := range yanktests {
+		testname := fmt.Sprintf("yank-%s-filter-%s",
+			testdata.name, testdata.filter)
+		t.Run(testname, func(t *testing.T) {
+			conf := cfg.Config{
+				OutputMode:     cfg.ASCII,
+				UseYankColumns: testdata.yank,
+				NoColor:        true,
+			}
+
+			conf.ApplyDefaults()
+			data := newData() // defined in printer_test.go, reused here
+
+			var writer bytes.Buffer
+			printData(&writer, conf, &data)
+
+			got, err := cb.PasteText()
+			if err != nil {
+				t.Errorf("failed to fetch yanked text from clipboard")
+			}
+
+			if got != testdata.expect {
+				t.Errorf("not yanked correctly:\n+++ got:\n%s\n+++ want:\n%s",
+					got, testdata.expect)
+			}
+		})
+	}
+}
--- a/main.go
+++ b/main.go
@@ -18,9 +18,17 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package main

 import (
+	"os"
+
 	"github.com/tlinden/tablizer/cmd"
 )

 func main() {
-	cmd.Execute()
+	os.Exit(Main())
+}
+
+func Main() int {
+	cmd.Execute()
+
+	return 0 // cmd takes care of exit 1 itself
 }
--- a/main_test.go
+++ b/main_test.go
@@ -0,0 +1,20 @@
+package main
+
+import (
+	"os"
+	"testing"
+
+	"github.com/rogpeppe/go-internal/testscript"
+)
+
+func TestMain(m *testing.M) {
+	os.Exit(testscript.RunMain(m, map[string]func() int{
+		"tablizer": Main,
+	}))
+}
+
+func TestTablizer(t *testing.T) {
+	testscript.Run(t, testscript.Params{
+		Dir: "t",
+	})
+}
--- a/t/test-basics.txtar
+++ b/t/test-basics.txtar
@@ -0,0 +1,43 @@
+# usage
+exec tablizer -h
+stdout Usage
+
+# version
+exec tablizer -V
+stdout version
+
+# manpage
+exec tablizer -m
+stdout SYNOPSIS
+
+# completion
+exec tablizer --completion bash
+stdout __tablizer_init_completion
+
+# use config (configures  colors, but these are not  being used, since
+# this  env doesn't  support it,  but at  least it  should succeed.
+exec tablizer -f config.hcl -r testtable.txt Runn
+stdout Runn
+
+
+
+# will be automatically created in work dir
+-- testtable.txt --
+NAME                                                 READY   STATUS    RESTARTS       AGE
+alertmanager-kube-prometheus-alertmanager-0          2/2     Running   35 (45m ago)   11d
+grafana-fcc54cbc9-bk7s8                              1/1     Running   17 (45m ago)   1d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7   1/1     Running   17 (45m ago)   1h44m
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f    1/1     Running   20 (45m ago)   45m
+kube-prometheus-node-exporter-bfzpl                  1/1     Running   17 (45m ago)   54s
+
+
+-- config.hcl --
+BG             = "lightGreen"
+FG             = "white"
+HighlightBG    = "lightGreen"
+HighlightFG    = "white"
+NoHighlightBG  = "white"
+NoHighlightFG  = "lightGreen"
+HighlightHdrBG = "red"
+HighlightHdrFG = "white"
+
--- a/t/test-csv.txtar
+++ b/t/test-csv.txtar
@@ -0,0 +1,26 @@
+# reading from file and matching with lowercase words
+exec tablizer -c name,status -r testtable.csv -s,
+stdout grafana.*Runn
+
+# matching mixed case
+exec tablizer -c NAME,staTUS -r testtable.csv -s,
+stdout grafana.*Runn
+
+# matching using numbers
+exec tablizer -c 1,3 -r testtable.csv -s,
+stdout grafana.*Runn
+
+# matching using regex
+exec tablizer -c 'na.*,stat.' -r testtable.csv -s,
+stdout grafana.*Runn
+
+
+# will be automatically created in work dir
+-- testtable.csv --
+NAME,READY,STATUS,RESTARTS,AGE
+alertmanager-kube-prometheus-alertmanager-0,2/2,Running,35 (45m ago),11d
+grafana-fcc54cbc9-bk7s8,1/1,Running,17 (45m ago),1d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7,1/1,Running,17 (45m ago),1h44m
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f,1/1,Running,20 (45m ago),45m
+kube-prometheus-node-exporter-bfzpl,1/1,Running,17 (45m ago),54s
+
--- a/t/test-filtering.txtar
+++ b/t/test-filtering.txtar
@@ -0,0 +1,21 @@
+# filtering
+exec tablizer -r testtable.txt -F name=grafana
+stdout grafana.*Runn
+
+# filtering two columns
+exec tablizer -r testtable.txt -F name=prometh -F age=1h
+stdout blackbox.*Runn
+
+# filtering two same columns
+exec tablizer -r testtable.txt -F name=prometh -F name=alert
+stdout prometheus-alertmanager.*Runn
+
+
+# will be automatically created in work dir
+-- testtable.txt --
+NAME                                                 READY   STATUS    RESTARTS       AGE
+alertmanager-kube-prometheus-alertmanager-0          2/2     Running   35 (45m ago)   11d
+grafana-fcc54cbc9-bk7s8                              1/1     Running   17 (45m ago)   1d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7   1/1     Running   17 (45m ago)   1h44m
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f    1/1     Running   20 (45m ago)   45m
+kube-prometheus-node-exporter-bfzpl                  1/1     Running   17 (45m ago)   54s
--- a/t/test-headermatching.txtar
+++ b/t/test-headermatching.txtar
@@ -0,0 +1,25 @@
+# reading from file and matching with lowercase words
+exec tablizer -c name,status -r testtable.txt
+stdout grafana.*Runn
+
+# matching mixed case
+exec tablizer -c NAME,staTUS -r testtable.txt
+stdout grafana.*Runn
+
+# matching using numbers
+exec tablizer -c 1,3 -r testtable.txt
+stdout grafana.*Runn
+
+# matching using regex
+exec tablizer -c 'na.*,stat.' -r testtable.txt
+stdout grafana.*Runn
+
+
+# will be automatically created in work dir
+-- testtable.txt --
+NAME                                                 READY   STATUS    RESTARTS       AGE
+alertmanager-kube-prometheus-alertmanager-0          2/2     Running   35 (45m ago)   11d
+grafana-fcc54cbc9-bk7s8                              1/1     Running   17 (45m ago)   1d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7   1/1     Running   17 (45m ago)   1h44m
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f    1/1     Running   20 (45m ago)   45m
+kube-prometheus-node-exporter-bfzpl                  1/1     Running   17 (45m ago)   54s
--- a/t/test-sort.txtar
+++ b/t/test-sort.txtar
@@ -0,0 +1,49 @@
+# sort by name
+exec tablizer -r testtable.txt -k 1
+stdout '^alert.*\n^grafana.*\n^kube'
+
+# sort by name reversed
+exec tablizer -r testtable.txt -k 1 -D
+stdout 'kube.*\n^grafana.*\n^alert'
+
+# sort by starts numerically
+exec tablizer -r testtable.txt -k 4 -i -c4
+stdout '17\s*\n^20\s*\n^35'
+
+# sort by starts numerically reversed
+exec tablizer -r testtable.txt -k 4 -i -c4 -D
+stdout '35\s*\n^20\s*\n^17'
+
+# sort by age
+exec tablizer -r testtable.txt -k 5 -a
+stdout '45m\s*\n.*1h44m'
+
+# sort by age reverse
+exec tablizer -r testtable.txt -k 5 -a -D
+stdout '1h44m\s*\n.*45m'
+
+# sort by time
+exec tablizer -r timetable.txt -k 2 -t
+stdout '^sel.*\n^foo.*\nbar'
+
+# sort by time reverse
+exec tablizer -r timetable.txt -k 2 -t -D
+stdout '^bar.*\n^foo.*\nsel'
+
+
+# will be automatically created in work dir
+-- testtable.txt --
+NAME                                                 READY   STATUS    STARTS      AGE
+alertmanager-kube-prometheus-alertmanager-0          2/2     Running   35          11d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7   1/1     Running   17          1h44m
+grafana-fcc54cbc9-bk7s8                              1/1     Running   17          1d
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f    1/1     Running   20          45m
+kube-prometheus-node-exporter-bfzpl                  1/1     Running   17          54s
+
+
+
+-- timetable.txt --
+NAME  TIME
+foo   2024-11-18T12:00:00+01:00
+bar   2024-11-18T12:45:00+01:00
+sel   2024-07-18T12:00:00+01:00
--- a/t/test-stdin.txtar
+++ b/t/test-stdin.txtar
@@ -0,0 +1,18 @@
+# reading from stdin and matching with lowercase words
+stdin testtable.txt
+exec tablizer -c name,status
+stdout grafana.*Runn
+
+# reading from -r stdin and matching with lowercase words
+stdin testtable.txt
+exec tablizer -c name,status -r -
+stdout grafana.*Runn
+
+# will be automatically created in work dir
+-- testtable.txt --
+NAME                                                 READY   STATUS    RESTARTS       AGE
+alertmanager-kube-prometheus-alertmanager-0          2/2     Running   35 (45m ago)   11d
+grafana-fcc54cbc9-bk7s8                              1/1     Running   17 (45m ago)   1d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7   1/1     Running   17 (45m ago)   1h44m
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f    1/1     Running   20 (45m ago)   45m
+kube-prometheus-node-exporter-bfzpl                  1/1     Running   17 (45m ago)   54s
--- a/t/test-transpose.txtar
+++ b/t/test-transpose.txtar
@@ -0,0 +1,21 @@
+# transpose one field
+exec tablizer -r testtable.txt -T status -R '/Running/OK/'
+stdout grafana.*OK
+
+# transpose two fields
+exec tablizer -r testtable.txt -T name,status -R '/alertmanager-//' -R '/Running/OK/' 
+stdout prometheus-0.*OK
+
+# transpose one field and show one column
+exec tablizer -r testtable.txt -T status -R '/Running/OK/' -c name
+! stdout grafana.*OK
+
+
+# will be automatically created in work dir
+-- testtable.txt --
+NAME                                                 READY   STATUS    RESTARTS       AGE
+alertmanager-kube-prometheus-alertmanager-0          2/2     Running   35 (45m ago)   11d
+grafana-fcc54cbc9-bk7s8                              1/1     Running   17 (45m ago)   1d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7   1/1     Running   17 (45m ago)   1h44m
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f    1/1     Running   20 (45m ago)   45m
+kube-prometheus-node-exporter-bfzpl                  1/1     Running   17 (45m ago)   54s
--- a/t/test.sh
+++ b/t/test.sh
@@ -1,45 +0,0 @@
-#!/bin/sh
-
-# simple commandline unit test script
-
-t="../tablizer"
-fail=0
-
-ex() {
-    # execute a test, report+exit on error, stay silent otherwise
-    log="/tmp/test-tablizer.$$.log"
-    name=$1
-    shift
-
-    echo -n "TEST $name "
-
-    $* > $log 2>&1
-
-    if test $? -ne 0; then
-        echo "failed, see $log"
-        fail=1
-    else
-        echo "ok"
-        rm -f $log
-    fi
-}
-
-# only use files in test dir
-cd $(dirname $0)
-
-echo "Executing commandline tests ..."
-
-# io pattern tests
-ex io-pattern-and-file $t bk7 testtable
-cat testtable | ex io-pattern-and-stdin $t bk7
-cat testtable | ex io-pattern-and-stdin-dash $t bk7 -
-
-# same w/o pattern
-ex io-just-file $t testtable
-cat testtable | ex io-just-stdin $t
-cat testtable | ex io-just-stdin-dash $t -
-
-if test $fail -ne 0; then
-    echo "!!! Some tests failed !!!"
-    exit 1
-fi
--- a/t/testtable.csv
+++ b/t/testtable.csv
@@ -0,0 +1,6 @@
+NAME,DURATION
+x,10
+a,100
+z,0
+u,4
+k,6
--- a/t/testtable3
+++ b/t/testtable3
@@ -0,0 +1,6 @@
+NAME                                                 READY   STATUS    STARTS      AGE
+alertmanager-kube-prometheus-alertmanager-0          2/2     Running   35          11d
+kube-prometheus-blackbox-exporter-5d85b5d8f4-tskh7   1/1     Running   17          1h44m
+grafana-fcc54cbc9-bk7s8                              1/1     Running   17          1d
+kube-prometheus-kube-state-metrics-b4cd9487-75p7f    1/1     Running   20          45m
+kube-prometheus-node-exporter-bfzpl                  1/1     Running   17          54s
--- a/t/testtable4
+++ b/t/testtable4
@@ -0,0 +1,4 @@
+ONE  TWO
+1    4
+3    1
+5    2
--- a/tablizer.1
+++ b/tablizer.1
@@ -133,7 +133,7 @@
 .\" ========================================================================
 .\"
 .IX Title "TABLIZER 1"
-.TH TABLIZER 1 "2024-05-07" "1" "User Commands"
+.TH TABLIZER 1 "2025-01-23" "1" "User Commands"
 .\" For nroff, turn off justification.  Always turn off hyphenation; it makes
 .\" way too many mistakes in technical documents.
 .if n .ad l
@@ -147,39 +147,43 @@ tablizer \- Manipulate tabular output of other programs
 \&      tablizer [regex] [file, ...] [flags]
 \&    
 \&    Operational Flags:
-\&      \-c, \-\-columns string     Only show the speficied columns (separated by ,)
-\&      \-v, \-\-invert\-match       select non\-matching rows
-\&      \-n, \-\-no\-numbering       Disable header numbering
-\&      \-N, \-\-no\-color           Disable pattern highlighting
-\&      \-H, \-\-no\-headers         Disable headers display
-\&      \-s, \-\-separator string   Custom field separator
-\&      \-k, \-\-sort\-by int        Sort by column (default: 1)
-\&      \-z, \-\-fuzzy              Use fuzzy search [experimental]
-\&      \-F, \-\-filter field=reg   Filter given field with regex, can be used multiple times
+\&      \-c, \-\-columns string              Only show the speficied columns (separated by ,)
+\&      \-v, \-\-invert\-match                select non\-matching rows
+\&      \-n, \-\-no\-numbering                Disable header numbering
+\&      \-N, \-\-no\-color                    Disable pattern highlighting
+\&      \-H, \-\-no\-headers                  Disable headers display
+\&      \-s, \-\-separator string            Custom field separator
+\&      \-k, \-\-sort\-by int|name            Sort by column (default: 1)
+\&      \-z, \-\-fuzzy                       Use fuzzy search [experimental]
+\&      \-F, \-\-filter field=reg            Filter given field with regex, can be used multiple times
+\&      \-T, \-\-transpose\-columns string    Transpose the speficied columns (separated by ,)
+\&      \-R, \-\-regex\-transposer /from/to/  Apply /search/replace/ regexp to fields given in \-T
 \&
 \&    Output Flags (mutually exclusive):
-\&      \-X, \-\-extended           Enable extended output
-\&      \-M, \-\-markdown           Enable markdown table output
-\&      \-O, \-\-orgtbl             Enable org\-mode table output
-\&      \-S, \-\-shell              Enable shell evaluable output
-\&      \-Y, \-\-yaml               Enable yaml output
-\&      \-C, \-\-csv                Enable CSV output
-\&      \-A, \-\-ascii              Default output mode, ascii tabular
-\&      \-L, \-\-hightlight\-lines   Use alternating background colors for tables
+\&      \-X, \-\-extended                    Enable extended output
+\&      \-M, \-\-markdown                    Enable markdown table output
+\&      \-O, \-\-orgtbl                      Enable org\-mode table output
+\&      \-S, \-\-shell                       Enable shell evaluable output
+\&      \-Y, \-\-yaml                        Enable yaml output
+\&      \-C, \-\-csv                         Enable CSV output
+\&      \-A, \-\-ascii                       Default output mode, ascii tabular
+\&      \-L, \-\-hightlight\-lines            Use alternating background colors for tables
+\&      \-y, \-\-yank\-columns                Yank specified columns (separated by ,) to clipboard,
+\&                                        space separated
 \&
 \&    Sort Mode Flags (mutually exclusive):
-\&      \-a, \-\-sort\-age           sort according to age (duration) string
-\&      \-D, \-\-sort\-desc          Sort in descending order (default: ascending)
-\&      \-i, \-\-sort\-numeric       sort according to string numerical value
-\&      \-t, \-\-sort\-time          sort according to time string
+\&      \-a, \-\-sort\-age                    sort according to age (duration) string
+\&      \-D, \-\-sort\-desc                   Sort in descending order (default: ascending)
+\&      \-i, \-\-sort\-numeric                sort according to string numerical value
+\&      \-t, \-\-sort\-time                   sort according to time string
 \&
 \&    Other Flags:
-\&          \-\-completion <shell> Generate the autocompletion script for <shell>
-\&      \-f, \-\-config <file>      Configuration file (default: ~/.config/tablizer/config)
-\&      \-d, \-\-debug              Enable debugging
-\&      \-h, \-\-help               help for tablizer
-\&      \-m, \-\-man                Display manual page
-\&      \-V, \-\-version            Print program version
+\&          \-\-completion <shell>         Generate the autocompletion script for <shell>
+\&      \-f, \-\-config <file>              Configuration file (default: ~/.config/tablizer/config)
+\&      \-d, \-\-debug                      Enable debugging
+\&      \-h, \-\-help                       help for tablizer
+\&      \-m, \-\-man                        Display manual page
+\&      \-V, \-\-version                    Print program version
 .Ve
 .SH "DESCRIPTION"
 .IX Header "DESCRIPTION"
@@ -248,11 +252,20 @@ By  default, if  a  \fBpattern\fR  has been  speficied,  matches will  be
 highlighted. You can disable this behavior with the \fB\-N\fR option.
 .PP
 Use the  \fB\-k\fR option to specify  by which column to  sort the tabular
-data (as in \s-1GNU\s0 \fBsort\fR\|(1)). The default sort column is the first one. To
-disable sorting at all, supply 0  (Zero) to \-k. The default sort order
-is ascending. You can change this to descending order using the option
-\&\fB\-D\fR. The default  sort order is by string, but  there are other sort
-modes:
+data  (as in  \s-1GNU\s0  \fBsort\fR\|(1)).  The default  sort  column  is the  first
+one. You can specify column numbers or names. Column numbers start
+with 1, names are case insensitive. You can specify multiple columns
+separated by comma to sort, but the type must be the same. For example
+if you want to sort numerically, all columns must be numbers. If you
+use column numbers, then be aware, that these are the numbers before
+column extraction. For example if you have a table with 4 columns and
+specify \f(CW\*(C`\-c4\*(C'\fR, then only 1 column (the fourth) will be printed,
+however if you want to sort by this column, you'll have to specify
+\&\f(CW\*(C`\-k4\*(C'\fR.
+.PP
+The default  sort order  is ascending.  You can  change this  to
+descending order using the option \fB\-D\fR.  The default sort order is by
+alphanumeric string, but there are other sort modes:
 .IP "\fB\-a \-\-sort\-age\fR" 4
 .IX Item "-a --sort-age"
 Sorts duration strings like \*(L"1d4h32m51s\*(R".
@@ -348,6 +361,50 @@ We want to see only the \s-1CMD\s0 column and use a regex for this:
 .Ve
 .PP
 where \*(L"C\*(R" is our regexp which matches \s-1CMD.\s0
+.PP
+If a column specifier doesn't look like a regular expression, matching
+against header  fields will  be case  insensitive. So,  if you  have a
+field with  the name \f(CW\*(C`ID\*(C'\fR then  these will all match:  \f(CW\*(C`\-c id\*(C'\fR, \f(CW\*(C`\-c
+Id\*(C'\fR. The same rule applies to the options \f(CW\*(C`\-T\*(C'\fR and \f(CW\*(C`\-F\*(C'\fR.
+.SS "\s-1TRANSPOSE FIELDS USING REGEXPS\s0"
+.IX Subsection "TRANSPOSE FIELDS USING REGEXPS"
+You can manipulate field contents using regular expressions. You have
+to tell tablizer which field[s] to operate on using the option \f(CW\*(C`\-T\*(C'\fR
+and the search/replace pattern using \f(CW\*(C`\-R\*(C'\fR. The number of columns and
+patterns must match.
+.PP
+A search/replace pattern consists of the following elements:
+.PP
+.Vb 1
+\&    /search\-regexp/replace\-string/
+.Ve
+.PP
+The separator can be any valid character. Especially if you want to
+use a regexp containing the \f(CW\*(C`/\*(C'\fR character, eg:
+.PP
+.Vb 1
+\&    |search\-regexp|replace\-string|
+.Ve
+.PP
+Example:
+.PP
+.Vb 7
+\&    cat t/testtable2
+\&    NAME  DURATION
+\&    x     10
+\&    a     100
+\&    z     0
+\&    u     4
+\&    k     6
+\&    
+\&    cat t/testtable2 | tablizer \-T2 \-R \*(Aq/^\ed/4/\*(Aq \-n
+\&    NAME    DURATION 
+\&    x       40      
+\&    a       400     
+\&    z       4       
+\&    u       4       
+\&    k       4
+.Ve
 .SS "\s-1OUTPUT MODES\s0"
 .IX Subsection "OUTPUT MODES"
 There might be cases  when the tabular output of a  program is way too
@@ -387,6 +444,20 @@ more output modes available: \fBorgtbl\fR  which prints an Emacs org-mode
 table and  \fBmarkdown\fR which prints  a Markdown table,  \fByaml\fR, which
 prints  yaml encoding  and \s-1CSV\s0  mode, which  prints a  comma separated
 value file.
+.SS "\s-1PUT FIELDS TO CLIPBOARD\s0"
+.IX Subsection "PUT FIELDS TO CLIPBOARD"
+You can let tablizer put fields to the clipboard using the option
+\&\f(CW\*(C`\-y\*(C'\fR. This best fits the use-case when the result of your filtering
+yields just one row. For example:
+.PP
+.Vb 1
+\&    cloudctl cluster ls | tablizer \-yid matchbox
+.Ve
+.PP
+If \*(L"matchbox\*(R" matches one cluster, you can immediately use the id of
+that cluster somewhere else and paste it. Of course, if there are
+multiple matches, then all id's will be put into the clipboard
+separated by one space.
 .SS "\s-1ENVIRONMENT VARIABLES\s0"
 .IX Subsection "ENVIRONMENT VARIABLES"
 \&\fBtablizer\fR supports  certain environment variables which  use can use
--- a/tablizer.pod
+++ b/tablizer.pod
@@ -8,39 +8,43 @@ tablizer - Manipulate tabular output of other programs
      tablizer [regex] [file, ...] [flags]
    
    Operational Flags:
-      -c, --columns string     Only show the speficied columns (separated by ,)
-      -v, --invert-match       select non-matching rows
-      -n, --no-numbering       Disable header numbering
-      -N, --no-color           Disable pattern highlighting
-      -H, --no-headers         Disable headers display
-      -s, --separator string   Custom field separator
-      -k, --sort-by int        Sort by column (default: 1)
-      -z, --fuzzy              Use fuzzy search [experimental]
-      -F, --filter field=reg   Filter given field with regex, can be used multiple times
+      -c, --columns string              Only show the speficied columns (separated by ,)
+      -v, --invert-match                select non-matching rows
+      -n, --no-numbering                Disable header numbering
+      -N, --no-color                    Disable pattern highlighting
+      -H, --no-headers                  Disable headers display
+      -s, --separator string            Custom field separator
+      -k, --sort-by int|name            Sort by column (default: 1)
+      -z, --fuzzy                       Use fuzzy search [experimental]
+      -F, --filter field=reg            Filter given field with regex, can be used multiple times
+      -T, --transpose-columns string    Transpose the speficied columns (separated by ,)
+      -R, --regex-transposer /from/to/  Apply /search/replace/ regexp to fields given in -T

    Output Flags (mutually exclusive):
-      -X, --extended           Enable extended output
-      -M, --markdown           Enable markdown table output
-      -O, --orgtbl             Enable org-mode table output
-      -S, --shell              Enable shell evaluable output
-      -Y, --yaml               Enable yaml output
-      -C, --csv                Enable CSV output
-      -A, --ascii              Default output mode, ascii tabular
-      -L, --hightlight-lines   Use alternating background colors for tables
+      -X, --extended                    Enable extended output
+      -M, --markdown                    Enable markdown table output
+      -O, --orgtbl                      Enable org-mode table output
+      -S, --shell                       Enable shell evaluable output
+      -Y, --yaml                        Enable yaml output
+      -C, --csv                         Enable CSV output
+      -A, --ascii                       Default output mode, ascii tabular
+      -L, --hightlight-lines            Use alternating background colors for tables
+      -y, --yank-columns                Yank specified columns (separated by ,) to clipboard,
+                                        space separated

    Sort Mode Flags (mutually exclusive):
-      -a, --sort-age           sort according to age (duration) string
-      -D, --sort-desc          Sort in descending order (default: ascending)
-      -i, --sort-numeric       sort according to string numerical value
-      -t, --sort-time          sort according to time string
+      -a, --sort-age                    sort according to age (duration) string
+      -D, --sort-desc                   Sort in descending order (default: ascending)
+      -i, --sort-numeric                sort according to string numerical value
+      -t, --sort-time                   sort according to time string

    Other Flags:
-          --completion <shell> Generate the autocompletion script for <shell>
-      -f, --config <file>      Configuration file (default: ~/.config/tablizer/config)
-      -d, --debug              Enable debugging
-      -h, --help               help for tablizer
-      -m, --man                Display manual page
-      -V, --version            Print program version
+          --completion <shell>         Generate the autocompletion script for <shell>
+      -f, --config <file>              Configuration file (default: ~/.config/tablizer/config)
+      -d, --debug                      Enable debugging
+      -h, --help                       help for tablizer
+      -m, --man                        Display manual page
+      -V, --version                    Print program version


 =head1 DESCRIPTION
@@ -104,11 +108,20 @@ By  default, if  a  B<pattern>  has been  speficied,  matches will  be
 highlighted. You can disable this behavior with the B<-N> option.

 Use the  B<-k> option to specify  by which column to  sort the tabular
-data (as in GNU sort(1)). The default sort column is the first one. To
-disable sorting at all, supply 0  (Zero) to -k. The default sort order
-is ascending. You can change this to descending order using the option
-B<-D>. The default  sort order is by string, but  there are other sort
-modes:
+data  (as in  GNU  sort(1)).  The default  sort  column  is the  first
+one. You can specify column numbers or names. Column numbers start
+with 1, names are case insensitive. You can specify multiple columns
+separated by comma to sort, but the type must be the same. For example
+if you want to sort numerically, all columns must be numbers. If you
+use column numbers, then be aware, that these are the numbers before
+column extraction. For example if you have a table with 4 columns and
+specify C<-c4>, then only 1 column (the fourth) will be printed,
+however if you want to sort by this column, you'll have to specify
+C<-k4>.
+
+The default  sort order  is ascending.  You can  change this  to
+descending order using the option B<-D>.  The default sort order is by
+alphanumeric string, but there are other sort modes:

 =over

@@ -203,6 +216,46 @@ We want to see only the CMD column and use a regex for this:

 where "C" is our regexp which matches CMD.

+If a column specifier doesn't look like a regular expression, matching
+against header  fields will  be case  insensitive. So,  if you  have a
+field with  the name C<ID> then  these will all match:  C<-c id>, C<-c
+Id>. The same rule applies to the options C<-T> and C<-F>.
+
+
+=head2 TRANSPOSE FIELDS USING REGEXPS
+
+You can manipulate field contents using regular expressions. You have
+to tell tablizer which field[s] to operate on using the option C<-T>
+and the search/replace pattern using C<-R>. The number of columns and
+patterns must match.
+
+A search/replace pattern consists of the following elements:
+
+    /search-regexp/replace-string/
+
+The separator can be any valid character. Especially if you want to
+use a regexp containing the C</> character, eg:
+
+    |search-regexp|replace-string|
+
+Example:
+    
+    cat t/testtable2
+    NAME  DURATION
+    x     10
+    a     100
+    z     0
+    u     4
+    k     6
+    
+    cat t/testtable2 | tablizer -T2 -R '/^\d/4/' -n
+    NAME    DURATION 
+    x       40      
+    a       400     
+    z       4       
+    u       4       
+    k       4  
+
 =head2 OUTPUT MODES

 There might be cases  when the tabular output of a  program is way too
@@ -239,6 +292,19 @@ table and  B<markdown> which prints  a Markdown table,  B<yaml>, which
 prints  yaml encoding  and CSV  mode, which  prints a  comma separated
 value file.

+=head2 PUT FIELDS TO CLIPBOARD
+
+You can let tablizer put fields to the clipboard using the option
+C<-y>. This best fits the use-case when the result of your filtering
+yields just one row. For example:
+
+    cloudctl cluster ls | tablizer -yid matchbox
+
+If "matchbox" matches one cluster, you can immediately use the id of
+that cluster somewhere else and paste it. Of course, if there are
+multiple matches, then all id's will be put into the clipboard
+separated by one space.
+
 =head2 ENVIRONMENT VARIABLES

 B<tablizer> supports  certain environment variables which  use can use
@@ -341,6 +407,8 @@ the C<-L> parameter).
 Colorization can be turned off completely either by setting the
 parameter C<-N> or the environment variable B<NO_COLOR> to a true value.

+
+
 =head1 BUGS

 In order to report a bug, unexpected behavior, feature requests
Author	SHA1	Message	Date
Thomas von Dein	200f1f32f8	using patched tiagomeol/go-clipboard/clipboard, fixes #37	2025-01-28 14:40:17 +01:00
Thomas von Dein	768a19b4d6	fine tuning, added test, which hangs, but yanking works anyway	2025-01-23 13:59:02 +01:00
Thomas von Dein	dc718392b6	fix-import	2025-01-22 23:15:12 +01:00
Thomas von Dein	e8f4fef41c	fix #37 : make yank portable	2025-01-22 23:12:42 +01:00
Thomas von Dein	82f54c120d	catch err	2025-01-21 18:42:04 +01:00
T.v.Dein	2d5799e2f2	Use primary clipboard on unix	2025-01-20 21:27:26 +01:00
Thomas von Dein	8e33cadcaa	add -y	2025-01-20 19:28:19 +01:00
Thomas von Dein	03f3225f24	build release binaries using ci workflow	2025-01-18 10:51:28 +01:00
Thomas von Dein	63c7ef26b6	add -k<name> and sort by multiple columns support, fixes #34	2025-01-15 18:53:34 +01:00
dependabot[bot]	c2e7d8037a	Bump github.com/hashicorp/hcl/v2 from 2.22.0 to 2.23.0 Bumps [github.com/hashicorp/hcl/v2](https://github.com/hashicorp/hcl) from 2.22.0 to 2.23.0. - [Release notes](https://github.com/hashicorp/hcl/releases) - [Changelog](https://github.com/hashicorp/hcl/blob/main/CHANGELOG.md) - [Commits](https://github.com/hashicorp/hcl/compare/v2.22.0...v2.23.0) --- updated-dependencies: - dependency-name: github.com/hashicorp/hcl/v2 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>	2025-01-14 13:12:06 +01:00
Thomas von Dein	323c070caa	tests don't work on windows	2025-01-14 13:10:09 +01:00
Thomas von Dein	53cf1e2ebe	fix for windows	2025-01-14 13:10:09 +01:00
Thomas von Dein	16c5053752	satisfy linter	2025-01-14 13:10:09 +01:00
Thomas von Dein	7d2d9a55d3	added prior art, fixes #30 as well	2025-01-14 13:10:09 +01:00
Thomas von Dein	14c50b4e63	get rid of lisp interpreter, -R and -F are enough, fixes #30	2025-01-14 13:10:09 +01:00
Thomas von Dein	0e68dc585d	added testscript test to test the combination of all tasks	2025-01-14 13:10:09 +01:00
Thomas von Dein	6ca835add1	changed file handling, use -r <file> or nothing to use stdin	2025-01-14 13:10:09 +01:00
Thomas von Dein	306f583522	fixed transpose error message if count is incorrect	2025-01-14 13:10:09 +01:00
Thomas von Dein	9f971ed3b9	fix #32 : treat header filters case insensitively	2025-01-14 13:10:09 +01:00
Thomas von Dein	2ae2d2b33d	add transpose stuff to README, bump version	2025-01-14 13:10:09 +01:00
Thomas von Dein	cf1a555b9b	added tests, reorganized Parse() by dismantling parsing and processing	2025-01-14 13:10:09 +01:00
Thomas von Dein	4d894a728b	added transpose function (-T + -R)	2025-01-14 13:10:09 +01:00
Thomas von Dein	8792c5a40f	fix regex in example	2025-01-10 18:33:55 +01:00
Thomas von Dein	7ab1a1178a	add zygo reference	2025-01-10 18:27:41 +01:00
Thomas von Dein	1e44da4f6e	added documentation about current state of lisp support	2025-01-10 18:26:33 +01:00
Thomas von Dein	59171f0fab	bump versions	2024-12-13 10:37:44 +01:00
Thomas von Dein	8098ccf000	fix #29 : fix stat() error checking	2024-12-13 10:35:56 +01:00
Thomas von Dein	4dc87ac22e	fix #27 : check if parsed headers and columns match	2024-11-04 11:13:53 +01:00
Thomas von Dein	ef5211e45f	only works on 1.22	2024-09-27 11:15:23 +02:00
Thomas von Dein	1a80e72737	fix version quoting	2024-09-27 11:04:32 +02:00
Thomas von Dein	8e765b167f	ok, only test with 1.22.1	2024-09-25 18:55:04 +02:00
Thomas von Dein	30f4b67538	bump version and add current go versions for testing	2024-09-25 18:52:47 +02:00
Thomas von Dein	383b5db47e	try 1.22.1	2024-09-25 18:40:13 +02:00
Thomas von Dein	f7d812b372	try to quote go version	2024-09-25 18:38:06 +02:00
Thomas von Dein	480f5f617d	only try 1.20	2024-09-25 18:33:46 +02:00
Thomas von Dein	586e36c181	update to go 1.22	2024-09-25 18:24:35 +02:00
dependabot[bot]	13c789b800	Bump github.com/alecthomas/repr from 0.1.1 to 0.4.0 Bumps [github.com/alecthomas/repr](https://github.com/alecthomas/repr) from 0.1.1 to 0.4.0. - [Commits](https://github.com/alecthomas/repr/compare/v0.1.1...v0.4.0) --- updated-dependencies: - dependency-name: github.com/alecthomas/repr dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 18:22:10 +02:00
dependabot[bot]	81e1394fd2	Bump github.com/gookit/color from 1.5.2 to 1.5.4 Bumps [github.com/gookit/color](https://github.com/gookit/color) from 1.5.2 to 1.5.4. - [Release notes](https://github.com/gookit/color/releases) - [Commits](https://github.com/gookit/color/compare/v1.5.2...v1.5.4) --- updated-dependencies: - dependency-name: github.com/gookit/color dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 18:22:00 +02:00
dependabot[bot]	b8099fe389	Bump github.com/spf13/cobra from 1.6.1 to 1.8.1 Bumps [github.com/spf13/cobra](https://github.com/spf13/cobra) from 1.6.1 to 1.8.1. - [Release notes](https://github.com/spf13/cobra/releases) - [Commits](https://github.com/spf13/cobra/compare/v1.6.1...v1.8.1) --- updated-dependencies: - dependency-name: github.com/spf13/cobra dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 18:21:46 +02:00
dependabot[bot]	1dc072aa67	Bump github.com/lithammer/fuzzysearch from 1.1.7 to 1.1.8 Bumps [github.com/lithammer/fuzzysearch](https://github.com/lithammer/fuzzysearch) from 1.1.7 to 1.1.8. - [Release notes](https://github.com/lithammer/fuzzysearch/releases) - [Commits](https://github.com/lithammer/fuzzysearch/compare/v1.1.7...v1.1.8) --- updated-dependencies: - dependency-name: github.com/lithammer/fuzzysearch dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 18:21:23 +02:00
dependabot[bot]	d92f63ca30	Bump github.com/hashicorp/hcl/v2 from 2.19.1 to 2.22.0 Bumps [github.com/hashicorp/hcl/v2](https://github.com/hashicorp/hcl) from 2.19.1 to 2.22.0. - [Release notes](https://github.com/hashicorp/hcl/releases) - [Changelog](https://github.com/hashicorp/hcl/blob/main/CHANGELOG.md) - [Commits](https://github.com/hashicorp/hcl/compare/v2.19.1...v2.22.0) --- updated-dependencies: - dependency-name: github.com/hashicorp/hcl/v2 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 18:13:50 +02:00
Thomas von Dein	78ccb8f54b	use non format logger	2024-09-25 18:06:00 +02:00
Thomas von Dein	a29104aeab	fix typos in issue templates	2024-09-25 18:06:00 +02:00
dependabot[bot]	45d9e219a5	Bump golangci/golangci-lint-action from 3 to 6 Bumps [golangci/golangci-lint-action](https://github.com/golangci/golangci-lint-action) from 3 to 6. - [Release notes](https://github.com/golangci/golangci-lint-action/releases) - [Commits](https://github.com/golangci/golangci-lint-action/compare/v3...v6) --- updated-dependencies: - dependency-name: golangci/golangci-lint-action dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 16:40:10 +02:00
dependabot[bot]	3eda59beeb	Bump actions/checkout from 3 to 4 Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4. - [Release notes](https://github.com/actions/checkout/releases) - [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md) - [Commits](https://github.com/actions/checkout/compare/v3...v4) --- updated-dependencies: - dependency-name: actions/checkout dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 16:39:58 +02:00
dependabot[bot]	7ada75c1d6	Bump actions/setup-go from 3 to 5 Bumps [actions/setup-go](https://github.com/actions/setup-go) from 3 to 5. - [Release notes](https://github.com/actions/setup-go/releases) - [Commits](https://github.com/actions/setup-go/compare/v3...v5) --- updated-dependencies: - dependency-name: actions/setup-go dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>	2024-09-25 16:39:36 +02:00
Thomas von Dein	83d5628430	add dependabot config	2024-09-25 16:33:54 +02:00