Kyle Evans 3b89018938 getopt_long(3): Document behavior of leading characters in optstring
Leading '+', '-', and ':' in optstring have special meaning. We briefly
mention that the first two have special meaning in that we say
POSIXLY_CORRECT turns them off, but we don't actually document their
meaning. Add a paragraph to RETURN VALUES explaining how they control
the treatment of non-option arguments.

A leading ':' has no mention; add a note that it suppresses warnings about
missing arguments.

Reviewed by:	jilles
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D14142
2018-08-12 00:08:14 +00:00
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