fine tuning, added test, which hangs, but yanking works anyway

tablizer.pod

@@ -29,6 +29,8 @@ tablizer - Manipulate tabular output of other programs
       -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
@@ -290,6 +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