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: src/usr.sbin/chroot/chroot.8,v 1.5.2.5 2003/03/12 22:08:13 trhodes Exp $ 34.\" $DragonFly: src/usr.sbin/chroot/chroot.8,v 1.3 2003/08/24 16:04:16 drhodus Exp $ 35.\" 36.Dd January 24, 2003 37.Dt CHROOT 8 38.Os 39.Sh NAME 40.Nm chroot 41.Nd change root directory 42.Sh SYNOPSIS 43.Nm 44.Op Fl u Ar user 45.Op Fl g Ar group 46.Op Fl G Ar group,group,... 47.Ar newroot 48.Op Ar command 49.Sh DESCRIPTION 50The 51.Nm 52utility changes its current and root directories to the supplied directory 53.Ar newroot 54and then exec's 55.Ar command , 56if supplied, 57or an interactive copy of the user's login shell. 58.Pp 59If the 60.Fl u , 61.Fl g 62or 63.Fl G 64options are given, 65the user, 66group and group list of the process are set to 67these values after the 68.Xr chroot 8 69has taken place. 70.Sh ENVIRONMENT 71The following environment variable is referenced by 72.Nm : 73.Bl -tag -width ".Ev SHELL" 74.It Ev SHELL 75If set, 76the string specified by 77.Ev SHELL 78is interpreted as the name of 79the shell to exec. 80If the variable 81.Ev SHELL 82is not set, 83.Pa /bin/sh 84is used. 85.El 86.Sh SEE ALSO 87.Xr chdir 2 , 88.Xr chroot 2 , 89.Xr setgid 2 , 90.Xr setgroups 2 , 91.Xr setuid 2 , 92.Xr getgrnam 3 , 93.Xr environ 7 , 94.Xr jail 8 95.Sh HISTORY 96The 97.Nm 98utility first appeared in 99.Bx 4.4 . 100