GNU bug report logs - #24929
comm enhancement proposal: --print-summary --quiet

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Message #29 received at 24929 <at> debbugs.gnu.org (full text, mbox):

From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: Pádraig Brady <P <at> draigBrady.com>
Cc: Bernhard Voelker <mail <at> bernhard-voelker.de>, 24929 <at> debbugs.gnu.org
Subject: Re: bug#24929: comm enhancement proposal: --print-summary --quiet
Date: Sat, 19 Nov 2016 05:43:24 +0800

The example is confusing, as it just happens to result in 1 2 3,

$ printf '%s\n' 1 2 3 4     > file1
$ printf '%s\n'   2 3 4 5 6 > file2
$ comm --total -123 file1 file2
1       2       3       total

So please use

$ printf '%s\n' 0   2 3   5 6       > file1
$ printf '%s\n'   1 2   4   6 7 8 9 > file2
$ comm --total -123 file1 file2
3       5       2      total

Also add a note "However --total is a GNU extension. For a portable way
to make totals, use wc:

$ echo Lines only in 1st = $(comm -23 file1 file2 | wc -l)
$ echo Lines only in 2nd = $(comm -13 file1 file2 | wc -l)
$ echo Lines in both =     $(comm -12 file1 file2 | wc -l)

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