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Jim Meyering
d614857d03
for support of obsolete "-DIGITS" option syntax in nice, and which prohibits options with optional arguments like date's -I option. (ISO_8601_OPTION): New enum value. (long_options): Use it. (short_options): New constant. (usage): Document the change. (main): Conform to POSIX 1003.1-2001 if POSIX2_VERSION says to, otherwise warn of obsolete usage if OBSOLETE_OPTION_WARNINGS is nonzero and if not POSIXLY_CORRECT.