| CHGRP(1) | General Commands Manual | CHGRP(1) | 
chgrp —
| chgrp | [ -R[-H|-L|-P]]
      [-fhv] group
      file ... | 
| chgrp | [ -R[-H|-L|-P]]
      [-fhv]--reference=rfilefile ... | 
chgrp utility sets the group ID of the file named by
  each file operand to the group ID
  specified by the group operand, or to the group of the given
  rfile, specified by the
  --reference argument.
Options:
-H-R option is specified, symbolic links on
      the command line are followed. (Symbolic links encountered in the tree
      traversal are not followed.)-L-R option is specified, all symbolic links
      are followed.-P-R option is specified, no symbolic links
      are followed.-R-f-h-vchgrp to be verbose, showing files as they
      are processed.If -h is not given, unless the
    -H or -L option is set,
    chgrp on a symbolic link always succeeds and has no
    effect. The -H, -L and
    -P options are ignored unless the
    -R option is specified. In addition, these options
    override each other and the command's actions are determined by the last one
    specified. The default is as if the -P option had
    been specified.
The group operand can be either a group name from the group database, or a numeric group ID. Since it is valid to have a group name that is numeric (and doesn't have the numeric ID that matches its name) the name lookup is always done first. Preceding the ID with a ``#'' character will force it to be taken as a number.
The user invoking chgrp must belong to the
    specified group and be the owner of the file, or be the super-user.
Unless invoked by the super-user, chgrp
    clears the set-user-id and set-group-id bits on a file to prevent accidental
    or mischievous creation of set-user-id or set-group-id programs.
chgrp utility exits 0 on success,
  and >0 if an error occurs.
chgrp utility is expected to be POSIX 1003.2
  compatible.
The -v option and the use of ``#'' to
    force a numeric group ID are extensions to IEEE Std 1003.2
    (“POSIX.2”).
| October 22, 2012 | NetBSD 10.1 |