[Bug 197567] chflags -f argument ignored when no file found to be modified

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197567

            Bug ID: 197567
           Summary: chflags -f argument ignored when no file found to be
                    modified
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jesco.freund at my-universe.com

According to the chflags(1) manual page, the -f argument should prevent chflags
from printing any message to stderr and from modifying its exit status.
However, when called with a a pattern not delivering any files, chflags will
still exit with status 1 and print "chflags: No match." to stderr.

This behaviour can be reproduced:

#~ mkdir test
#~ /bin/chflags -f noschg test/*
chflags: No match.
#~ echo $?
1

Suggested fix:
Either change behaviour of chflags to silently exit with status 0 when an empty
set of files is supplied (if called with the -f flag, of course) - or update
man page to document the current behaviour correctly.

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