1.\" Copyright (c) 1983, 1990, 1993, 1994, 2003 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the Institute of Electrical and Electronics Engineers, Inc. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" from: @(#)chgrp.1 8.3 (Berkeley) 3/31/94 32.\" $NetBSD: chgrp.1,v 1.4 2011/01/13 22:28:36 haad Exp $ 33.\" 34.Dd September 25, 2003 35.Dt CHGRP 1 36.Os 37.Sh NAME 38.Nm chgrp 39.Nd change group 40.Sh SYNOPSIS 41.Nm 42.Oo 43.Fl R 44.Op Fl H | Fl L | Fl P 45.Oc 46.Op Fl fhv 47.Ar group 48.Ar file ... 49.Sh DESCRIPTION 50The 51.Nm 52utility sets the group ID of the file named by each 53.Ar file 54operand to the 55.Ar group 56ID specified by the group operand. 57.Pp 58Options: 59.Bl -tag -width Ds 60.It Fl H 61If the 62.Fl R 63option is specified, symbolic links on the command line are followed. 64(Symbolic links encountered in the tree traversal are not followed.) 65.It Fl L 66If the 67.Fl R 68option is specified, all symbolic links are followed. 69.It Fl P 70If the 71.Fl R 72option is specified, no symbolic links are followed. 73.It Fl R 74Change the group ID for the file hierarchies rooted 75in the files instead of just the files themselves. 76.It Fl f 77The force option ignores errors, except for usage errors and doesn't 78query about strange modes (unless the user does not have proper permissions). 79.It Fl h 80If 81.Ar file 82is a symbolic link, the group of the link is changed. 83.It Fl v 84Cause 85.Nm 86to be verbose, showing files as they are processed. 87.El 88.Pp 89If 90.Fl h 91is not given, unless the 92.Fl H 93or 94.Fl L 95option is set, 96.Nm 97on a symbolic link always succeeds and has no effect. 98The 99.Fl H , 100.Fl L 101and 102.Fl P 103options are ignored unless the 104.Fl R 105option is specified. 106In addition, these options override each other and the 107command's actions are determined by the last one specified. 108.Pp 109The 110.Ar group 111operand can be either a group name from the group database, 112or a numeric group ID. 113Since it is valid to have a group name that is numeric (and 114doesn't have the numeric ID that matches its name) the name lookup 115is always done first. 116Preceding the ID with a ``#'' character will force it to be taken 117as a number. 118.Pp 119The user invoking 120.Nm 121must belong to the specified group and be the owner of the file, 122or be the super-user. 123.Pp 124Unless invoked by the super-user, 125.Nm 126clears the set-user-id and set-group-id bits on a file to prevent 127accidental or mischievous creation of set-user-id or set-group-id 128programs. 129.Pp 130The 131.Nm 132utility exits 0 on success, and \*[Gt]0 if an error occurs. 133.Sh FILES 134.Bl -tag -width /etc/group -compact 135.It Pa /etc/group 136Group ID file 137.El 138.Sh SEE ALSO 139.Xr chown 2 , 140.Xr lchown 2 , 141.Xr fts 3 , 142.Xr group 5 , 143.Xr passwd 5 , 144.Xr symlink 7 , 145.Xr chown 8 146.Sh STANDARDS 147The 148.Nm 149utility is expected to be POSIX 1003.2 compatible. 150.Pp 151The 152.Fl v 153option and the use of ``#'' to force a numeric group ID 154are extensions to 155.St -p1003.2 . 156