GNU bug report logs - #12847
comm wrong output

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From: gregrwm <backuppc-users <at> whitleymott.net>
To: 12847 <at> debbugs.gnu.org
Subject: bug#12847: comm wrong output
Date: Fri, 9 Nov 2012 15:54:12 -0600

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coreutils       8.13-3.2ubuntu2 (quantal)

using the attached files:
$  LC_ALL=C sort rqb.2012-11-07. >/tmp/pC   #ensure inputs are sorted
$  LC_ALL=C sort a0>/tmp/qC
$  LC_ALL=C comm -2 /tmp/[pq]C>/tmp/-2
$  LC_ALL=C comm -23 /tmp/[pq]C>/tmp/-23

the 2 comm commands produce identical output!
oughtn't the latter command only show lines unique to FILE1?

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