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like it will be approved. Also add --check=quiet, --check=silent as long aliases, and --check=diagnose-first as an alias for -c. * doc/coreutils.texi (sort invocation): Document this. Also, mention that sort -c can take at most one file. * src/sort.c: Implement this. Include argmatch.h. (usage): Document the change. (CHECK_OPTION): New constant. (long_options): --check now takes an optional argument, and is now treated differently from 'c'. (check_args, check_types): New constant arrays. (check): New arg CHECKONLY, which suppresses diagnostic if -C. (main): Parse the new options. * tests/sort/Test.pm (02d, 02d, incompat5, incompat6): New tests for -C.
A note about Makefile.am.in. It is used (usually only by the maintainer) to generate some of the Makefile.am files in these subdirectories.