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+.\" Copyright (c) 1983, 1990, 1993, 1994, 2003
+.\"	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. 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 1.8 2017/07/04 06:52:20 wiz Exp $
+.\"
+.Dd October 22, 2012
+.Dt CHGRP 1
+.Os
+.Sh NAME
+.Nm chgrp
+.Nd change group
+.Sh SYNOPSIS
+.Nm
+.Oo
+.Fl R
+.Op Fl H | Fl L | Fl P
+.Oc
+.Op Fl fhv
+.Ar group
+.Ar
+.Nm
+.Oo
+.Fl R
+.Op Fl H | Fl L | Fl P
+.Oc
+.Op Fl fhv
+.Fl Fl reference=rfile
+.Ar
+.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,
+or to the group of the given
+.Ar rfile ,
+specified by the
+.Fl Fl reference
+argument.
+.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.
+.It Fl v
+Cause
+.Nm
+to be verbose, showing files as they are processed.
+.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.
+The default is as if the
+.Fl P
+option had been specified.
+.Pp
+The
+.Ar 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.
+.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.
+.Sh FILES
+.Bl -tag -width /etc/group -compact
+.It Pa /etc/group
+Group ID file
+.El
+.Sh EXIT STATUS
+.Ex -std chgrp
+.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.
+.Pp
+The
+.Fl v
+option and the use of ``#'' to force a numeric group ID
+are extensions to
+.St -p1003.2 .