NetBSD/usr.sbin/chown/chgrp.1

.\" Copyright (c) 1983, 1990, 1993, 1994
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the Institute of Electrical and Electronics Engineers, Inc.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"     from: @(#)chgrp.1	8.3 (Berkeley) 3/31/94
.\"	$NetBSD: chgrp.1,v 1.10 1997/12/21 18:11:19 kleink Exp $
.\"
.Dd March 31, 1994
.Dt CHGRP 1
.Os BSD 4.2
.Sh NAME
.Nm chgrp
.Nd change group
.Sh SYNOPSIS
.Nm
.Oo
.Fl R
.Op Fl H | Fl L | Fl P
.Oc
.Op Fl fh
.Ar group
.Ar files ...
.Sh DESCRIPTION
The
.Nm
utility sets the group ID of the file named by each
.Ar file
operand to the
.Ar group
ID specified by the group operand.
.Pp
Options:
.Bl -tag -width Ds
.It Fl H
If the
.Fl R
option is specified, symbolic links on the command line are followed.
(Symbolic links encountered in the tree traversal are not followed.)
.It Fl L
If the
.Fl R
option is specified, all symbolic links are followed.
.It Fl P
If the
.Fl R
option is specified, no symbolic links are followed.
.It Fl R
Change the group ID for the file hierarchies rooted
in the files instead of just the files themselves.
.It Fl f
The force option ignores errors, except for usage errors and doesn't
query about strange modes (unless the user does not have proper permissions).
.It Fl h
If
.Ar file
is a symbolic link, the group of the link is changed.
.El
.Pp
If
.Fl h
is not given, unless the 
.Fl H
or
.Fl L
option is set,
.Nm
on a symbolic link always succeeds and has no effect.
The
.Fl H ,
.Fl L
and
.Fl P
options are ignored unless the
.Fl R
option is specified.
In addition, these options override each other and the
command's actions are determined by the last one specified.
.Pp
The
.Ar group
operand can be either a group name from the group database,
or a numeric group ID.
If a group name is also a numeric group ID, the operand is used as a
group name.
.Pp
The user invoking
.Nm
must belong to the specified group and be the owner of the file,
or be the super-user.
.Pp
Unless invoked by the super-user,
.Nm
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.
.Pp
The
.Nm
utility exits 0 on success, and >0 if an error occurs.
.Sh FILES
.Bl -tag -width /etc/group -compact
.It Pa /etc/group
Group ID file
.El
.Sh SEE ALSO
.Xr chown 2 ,
.Xr lchown 2 ,
.Xr fts 3 ,
.Xr group 5 ,
.Xr passwd 5 ,
.Xr symlink 7 ,
.Xr chown 8
.Sh STANDARDS
The
.Nm
utility is expected to be POSIX 1003.2 compatible.