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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)chroot.8 8.1 (Berkeley) 6/9/93 33.\" $FreeBSD$ 34.\" 35.Dd June 7, 2003 36.Dt CHROOT 8 37.Os 38.Sh NAME 39.Nm chroot 40.Nd change root directory 41.Sh SYNOPSIS 42.Nm 43.Op Fl u Ar user 44.Op Fl g Ar group 45.Op Fl G Ar group,group,... 46.Ar newroot 47.Op Ar command 48.Sh DESCRIPTION 49The 50.Nm 51utility changes its current and root directories to the supplied directory 52.Ar newroot 53and then exec's 54.Ar command , 55if supplied, 56or an interactive copy of the user's login shell. 57.Pp 58If the 59.Fl u , 60.Fl g 61or 62.Fl G 63options are given, 64the user, 65group and group list of the process are set to 66these values after the 67.Xr chroot 8 68has taken place. 69.Sh ENVIRONMENT 70The following environment variable is referenced by 71.Nm : 72.Bl -tag -width ".Ev SHELL" 73.It Ev SHELL 74If set, 75the string specified by 76.Ev SHELL 77is interpreted as the name of 78the shell to exec. 79If the variable 80.Ev SHELL 81is not set, 82.Pa /bin/sh 83is used. 84.El 85.Sh SEE ALSO 86.Xr chdir 2 , 87.Xr chroot 2 , 88.Xr setgid 2 , 89.Xr setgroups 2 , 90.Xr setuid 2 , 91.Xr getgrnam 3 , 92.Xr environ 7 , 93.Xr jail 8 94.Sh HISTORY 95The 96.Nm 97utility first appeared in 98.Bx 4.4 . 99