1.\" Copyright (c) 1988, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)chroot.8 8.1 (Berkeley) 6/9/93 29.\" $FreeBSD: src/usr.sbin/chroot/chroot.8,v 1.5.2.5 2003/03/12 22:08:13 trhodes Exp $ 30.\" $DragonFly: src/usr.sbin/chroot/chroot.8,v 1.3 2003/08/24 16:04:16 drhodus Exp $ 31.\" 32.Dd January 24, 2003 33.Dt CHROOT 8 34.Os 35.Sh NAME 36.Nm chroot 37.Nd change root directory 38.Sh SYNOPSIS 39.Nm 40.Op Fl u Ar user 41.Op Fl g Ar group 42.Op Fl G Ar group,group,... 43.Ar newroot 44.Op Ar command 45.Sh DESCRIPTION 46The 47.Nm 48utility changes its current and root directories to the supplied directory 49.Ar newroot 50and then exec's 51.Ar command , 52if supplied, 53or an interactive copy of the user's login shell. 54.Pp 55If the 56.Fl u , 57.Fl g 58or 59.Fl G 60options are given, 61the user, 62group and group list of the process are set to 63these values after the 64.Xr chroot 8 65has taken place. 66.Sh ENVIRONMENT 67The following environment variable is referenced by 68.Nm : 69.Bl -tag -width ".Ev SHELL" 70.It Ev SHELL 71If set, 72the string specified by 73.Ev SHELL 74is interpreted as the name of 75the shell to exec. 76If the variable 77.Ev SHELL 78is not set, 79.Pa /bin/sh 80is used. 81.El 82.Sh SEE ALSO 83.Xr chdir 2 , 84.Xr chroot 2 , 85.Xr setgid 2 , 86.Xr setgroups 2 , 87.Xr setuid 2 , 88.Xr getgrnam 3 , 89.Xr environ 7 , 90.Xr jail 8 91.Sh HISTORY 92The 93.Nm 94utility first appeared in 95.Bx 4.4 . 96