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 9, 1993 36.Dt CHROOT 8 37.Os 38.Sh NAME 39.Nm chroot 40.Nd change root directory 41.Sh SYNOPSIS 42.Nm 43.Ar newroot 44.Op Ar command 45.Sh DESCRIPTION 46The 47.Nm 48command changes its root directory to the supplied directory 49.Ar newroot 50and exec's 51.Ar command , 52if supplied, or an interactive copy of your shell. 53.Pp 54Note, 55.Ar command 56or the shell are run as your real-user-id. 57.Sh ENVIRONMENT 58The following environment variable is referenced by 59.Nm : 60.Bl -tag -width SHELL 61.It Ev SHELL 62If set, 63the string specified by 64.Ev SHELL 65is interpreted as the name of 66the shell to exec. 67If the variable 68.Ev SHELL 69is not set, 70.Pa /bin/sh 71is used. 72.El 73.Sh SEE ALSO 74.Xr chdir 2 , 75.Xr chroot 2 , 76.Xr environ 7 77.Sh HISTORY 78The 79.Nm 80utility first appeared in 81.Bx 4.4 . 82