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2026-04-22comm: don't close standard input twiceCollin Funk-0/+186
* NEWS: Mention the bug fix. * src/comm.c (usage): Remove mention that FILE1 and FILE2 cannot both be standard input. (compare_files): Only close standard input once. * doc/coreutils.texi (comm invocation): Document the behavior of 'comm - -' which is not portable to all implementations. * tests/comm/dash-dash.sh: New file. * tests/misc/comm.pl: Move to tests/comm/comm.pl. * tests/local.mk (all_tests): Add the new test. Rename the existing test.