1.\" $OpenBSD: chgrp.1,v 1.16 2014/01/21 22:35:44 jmc Exp $ 2.\" 3.\" Copyright (c) 1983, 1990, 1993, 1994 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the Institute of Electrical and Electronics Engineers, Inc. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" from: @(#)chgrp.1 8.3 (Berkeley) 3/31/94 34.\" 35.Dd $Mdocdate: January 21 2014 $ 36.Dt CHGRP 1 37.Os 38.Sh NAME 39.Nm chgrp 40.Nd change group 41.Sh SYNOPSIS 42.Nm chgrp 43.Op Fl h 44.Oo 45.Fl R 46.Op Fl H | L | P 47.Oc 48.Ar group 49.Ar 50.Sh DESCRIPTION 51.Nm 52sets the group ID of the specified files. 53.Pp 54The options are as follows: 55.Bl -tag -width Ds 56.It Fl H 57If the 58.Fl R 59option is specified, symbolic links on the command line are followed. 60Symbolic links encountered in the tree traversal are not followed. 61.It Fl h 62Change the group ID of the specified symbolic link. 63The 64.Fl h 65and 66.Fl R 67options are mutually exclusive. 68.It Fl L 69If the 70.Fl R 71option is specified, all symbolic links are followed. 72.It Fl P 73If the 74.Fl R 75option is specified, no symbolic links are followed. 76.It Fl R 77Recurse. 78Where 79.Ar file 80is a directory, 81change the group ID of the directory and all the files and directories 82in the file hierarchy below it. 83.El 84.Pp 85The 86.Fl H , 87.Fl L , 88and 89.Fl P 90options are ignored unless the 91.Fl R 92option is specified; 93if none of them are given, 94the default is to not follow symbolic links. 95In addition, these options override each other and the 96command's actions are determined by the last one specified. 97.Pp 98The 99.Ar group 100operand can be either a group name from the group database, 101or a numeric group ID. 102If a group name is also a numeric group ID, the operand is used as a 103group name. 104.Pp 105By default, 106.Nm 107clears the set-user-ID and set-group-ID bits on the file 108to prevent accidental or mischievous creation of 109set-user-ID and set-group-ID programs. 110This behaviour can be overridden by setting the 111.Xr sysctl 8 112variable 113.Va fs.posix.setuid 114to zero. 115.Pp 116The user invoking 117.Nm 118must belong to the specified group and be the owner of the file, 119or be the superuser. 120.Sh FILES 121.Bl -tag -width /etc/group -compact 122.It Pa /etc/group 123group ID file 124.El 125.Sh EXIT STATUS 126.Ex -std chgrp 127.Sh SEE ALSO 128.Xr chown 2 , 129.Xr fts 3 , 130.Xr group 5 , 131.Xr passwd 5 , 132.Xr symlink 7 , 133.Xr chown 8 134.Sh STANDARDS 135The 136.Nm 137utility is compliant with the 138.St -p1003.1-2008 139specification. 140