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281 lines
9.2 KiB
Groff
281 lines
9.2 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "TABLIZER 1"
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.TH TABLIZER 1 "2022-10-05" "1" "User Commands"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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tablizer \- Manipulate tabular output of other programs
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& Usage:
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\& tablizer [regex] [file, ...] [flags]
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\&
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\& Flags:
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\& \-c, \-\-columns string Only show the speficied columns (separated by ,)
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\& \-d, \-\-debug Enable debugging
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\& \-h, \-\-help help for tablizer
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\& \-v, \-\-invert\-match select non\-matching rows
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\& \-m, \-\-man Display manual page
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\& \-n, \-\-no\-numbering Disable header numbering
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\& \-o, \-\-output string Output mode \- one of: orgtbl, markdown, extended, ascii(default)
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\& \-X, \-\-extended Enable extended output
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\& \-M, \-\-markdown Enable markdown table output
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\& \-O, \-\-orgtbl Enable org\-mode table output
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\& \-s, \-\-separator string Custom field separator
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\& \-v, \-\-version Print program version
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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Many programs generate tabular output. But sometimes you need to
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post-process these tables, you may need to remove one or more columns
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or you may want to filter for some pattern or you may need the output
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in another program and need to parse it somehow. Standard unix tools
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such as \fBawk\fR\|(1), \fBgrep\fR\|(1) or \fBcolumn\fR\|(1) may help, but sometimes it's a
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tedious business.
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.PP
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Let's take the output of the tool kubectl. It contains cells with
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withespace and they do not separate columns by \s-1TAB\s0 characters. This is
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not easy to process.
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.PP
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You can use \fBtablizer\fR to do these and more things.
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.PP
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\&\fBtablizer\fR analyses the header fiels of a table, registers the column
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positions of each header field and separates columns by those
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positions.
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.PP
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Without any options it reads its input from \f(CW\*(C`STDIN\*(C'\fR, but you can also
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specify a file as a parameter. If you want to reduce the output by
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some regular expression, just specify it as its first parameter. You
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may also use the \fB\-v\fR option to exclude all rows which match the
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pattern. Hence:
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.PP
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.Vb 2
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\& # read from STDIN
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\& kubectl get pods | tablizer
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\&
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\& # read a file
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\& tablizer filename
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\&
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\& # search for pattern in a file (works like grep)
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\& tablizer regex filename
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\&
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\& # search for pattern in STDIN
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\& kubectl get pods | tablizer regex
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.Ve
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.PP
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The output looks like the original one but every header field will
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have a numer associated with it, e.g.:
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.PP
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.Vb 1
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\& NAME(1) READY(2) STATUS(3) RESTARTS(4) AGE(5)
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.Ve
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.PP
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These numbers denote the column and you can use them to specify which
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columns you want to have in your output:
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.PP
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.Vb 1
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\& kubectl get pods | tablizer \-c1,3
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.Ve
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.PP
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You can specify the numbers in any order but output will always follow
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the original order.
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.PP
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The numbering can be suppressed by using the \fB\-n\fR option.
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.PP
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Finally the \fB\-d\fR option enables debugging output which is mostly
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usefull for the developer.
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.SS "\s-1OUTPUT MODES\s0"
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.IX Subsection "OUTPUT MODES"
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There might be cases when the tabular output of a program is way too
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large for your current terminal but you still need to see every
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column. In such cases the \fB\-o extended\fR or \fB\-X\fR option can be
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usefull which enables \fIextended mode\fR. In this mode, each row will be
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printed vertically, header left, value right, aligned by the field
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widths. Here's an example:
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.PP
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.Vb 6
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\& kubectl get pods | ./tablizer \-o extended
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\& NAME: repldepl\-7bcd8d5b64\-7zq4l
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\& READY: 1/1
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\& STATUS: Running
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\& RESTARTS: 1 (71m ago)
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\& AGE: 5h28m
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.Ve
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.PP
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You can of course still use a regex to reduce the number of rows
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displayed.
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.PP
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The option \fB\-o shell\fR can be used if the output has to be processed
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by the shell, it prints variable assignments for each cell, one line
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per row:
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.PP
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.Vb 4
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\& kubectl get pods | ./tablizer \-o extended ./tablizer \-o shell
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\& NAME="repldepl\-7bcd8d5b64\-7zq4l" READY="1/1" STATUS="Running" RESTARTS="9 (47m ago)" AGE="4d23h"
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\& NAME="repldepl\-7bcd8d5b64\-m48n8" READY="1/1" STATUS="Running" RESTARTS="9 (47m ago)" AGE="4d23h"
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\& NAME="repldepl\-7bcd8d5b64\-q2bf4" READY="1/1" STATUS="Running" RESTARTS="9 (47m ago)" AGE="4d23h"
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.Ve
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.PP
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You can use this in an eval loop.
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.PP
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Beside normal ascii mode (the default) and extended mode there are
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more output modes available: \fBorgtbl\fR which prints an Emacs org-mode
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table and \fBmarkdown\fR which prints a Markdown table.
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.SH "BUGS"
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.IX Header "BUGS"
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In order to report a bug, unexpected behavior, feature requests
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or to submit a patch, please open an issue on github:
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<https://github.com/TLINDEN/tablizer/issues>.
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.SH "LICENSE"
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.IX Header "LICENSE"
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This software is licensed under the \s-1GNU GENERAL PUBLIC LICENSE\s0 version 3.
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.PP
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Copyright (c) 2022 by Thomas von Dein
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.PP
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This software uses the following \s-1GO\s0 libraries:
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.IP "repr (https://github.com/alecthomas/repr)" 4
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.IX Item "repr (https://github.com/alecthomas/repr)"
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Released under the \s-1MIT\s0 License, Copyright (c) 2016 Alec Thomas
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.IP "cobra (https://github.com/spf13/cobra)" 4
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.IX Item "cobra (https://github.com/spf13/cobra)"
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Released under the Apache 2.0 license, Copyright 2013\-2022 The Cobra Authors
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.SH "AUTHORS"
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.IX Header "AUTHORS"
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Thomas von Dein \fBtom \s-1AT\s0 vondein \s-1DOT\s0 org\fR
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