NetBSD/usr.sbin/chown/chgrp.1

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.\" Copyright (c) 1983, 1990, 1993, 1994
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.\"
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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.\" from: @(#)chgrp.1 8.3 (Berkeley) 3/31/94
.\" $NetBSD: chgrp.1,v 1.10 1997/12/21 18:11:19 kleink Exp $
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.\"
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.Dd March 31, 1994
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.Dt CHGRP 1
.Os BSD 4.2
.Sh NAME
.Nm chgrp
.Nd change group
.Sh SYNOPSIS
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.Nm
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.Oo
.Fl R
.Op Fl H | Fl L | Fl P
.Oc
.Op Fl fh
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.Ar group
.Ar files ...
.Sh DESCRIPTION
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The
.Nm
utility sets the group ID of the file named by each
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.Ar file
operand to the
.Ar group
ID specified by the group operand.
.Pp
Options:
.Bl -tag -width Ds
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.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.
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.It Fl R
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Change the group ID for the file hierarchies rooted
in the files instead of just the files themselves.
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.It Fl f
The force option ignores errors, except for usage errors and doesn't
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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.
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.El
.Pp
If
.Fl h
is not given, unless the
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.Fl H
or
.Fl L
option is set,
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.Nm
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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
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The
.Ar group
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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.
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.Pp
The user invoking
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.Nm
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must belong to the specified group and be the owner of the file,
or be the super-user.
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.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
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The
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.Nm
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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 ,
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.Xr group 5 ,
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.Xr passwd 5 ,
.Xr symlink 7 ,
.Xr chown 8
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.Sh STANDARDS
The
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.Nm
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utility is expected to be POSIX 1003.2 compatible.