1.\" Copyright (c) 1988, 1991 The Regents of the University of California. 2.\" 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 5.3 (Berkeley) 3/16/91 33.\" 34.Dd March 16, 1991 35.Dt CHROOT 8 36.Os BSD 4.3 37.Sh NAME 38.Nm chroot 39.Nd change root directory 40.Sh SYNOPSIS 41.Nm chroot 42.Ar newroot 43.Op Ar command 44.Sh DESCRIPTION 45The 46.Nm chroot 47command changes its root directory to the supplied directory 48.Ar newroot 49and exec's 50.Ar command , 51if supplied, or an interactive copy of your shell. 52.Pp 53Note, 54.Ar command 55or the shell are run as your real-user-id. 56.Sh ENVIRONMENT 57The following environment variable is referenced by 58.Nm chroot : 59.Bl -tag -width SHELL 60.It Ev SHELL 61If set, 62the string specified by 63.Ev SHELL 64is interpreted as the name of 65the shell to exec. 66If the variable 67.Ev SHELL 68is not set, 69.Pa /bin/sh 70is used. 71.El 72.Sh SEE ALSO 73.Xr chdir 2 , 74.Xr chroot 2 , 75.Xr environ 7 76.Sh HISTORY 77The 78.Nm 79command 80.Ud 81