[Bug 90114] [patch] pw(8) takes strings after option -g for GID 0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=90114

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: bapt
Date: Tue Oct 28 14:54:05 UTC 2014
New revision: 273782
URL: https://svnweb.freebsd.org/changeset/base/273782

Log:
  Do not delete the group wheel when bad argument is passed to pw groupdel -g

  Check that the -g argument is actually a number, if not report an error.
  This argument is converted without checking with atoi(3) later so without
this
  check it converts any alpha entries into 0 meaning it deletes the group wheel

  Add a regression test about it

  PR:        90114
  Reported by:    bkoenig at cs.tu-berlin.de
  MFC after:    1 week

Changes:
  head/usr.sbin/pw/pw_group.c
  head/usr.sbin/pw/tests/pw_delete.sh

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