I typically use column to convert input into a table, eg:

$ echo 'a\tb\tc\nd\te\tf' | column -t -s $'\t'
a  b  c
d  e  f

However it collapses empty columns eg:

$ echo 'a\tb\tc\nd\t\tf' | column -t -s $'\t'
a  b  c
d  f

Rather than printing an empty column when there are consecutive delimiters. This is what I would like, using column or otherwise:

a  b  c
d     f
  • 1
    Instead of echo try printf – Romeo Ninov Jan 23 at 11:53
  • 2
    The questioner is clearly using a shell where -e is implied. We have a whole family of duplicate Q&As about that, starting from unix.stackexchange.com/questions/65803 . But that is not the focus of this question, which is about the column command. Imagine that the input of the column command is whatever is necessary to yield TAB-delimited fields within LF-delimited records, some of which are empty. – JdeBP Jan 23 at 12:14

If you use GNU column:

By default, the column command will merge multiple adjacent delimiters into a single delimiter when using the -t option; this option disables that behavior. This option is a Debian GNU/Linux extension.

printf 'a\tb\tc\nd\t\tf\n'  | column -t -n -s $'\t'


a  b  c
d     f

If GNU column is not available, you can use sed to add a space (or something else, e.g. a -) between the tabs:

printf 'a\tb\tc\nd\t\tf\n'  | sed -e ':loop; s/\t\t/\t-\t/; t loop' | column -t -s $'\t'
  • Thanks for the sed suggestion! I'm using Mac OS X so don't have GNU column or GNU sed, so this is what ended up working for me: printf 'a\tb\tc\nd\t\tf\n' | sed -$'s/\t\t/\t-\t/g' | column -t -s $'\t' – tekumara Jan 24 at 3:21

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