freebsd man page for chroot

CHROOT(8)						    BSD System Manager's Manual 						 CHROOT(8)

NAME
     chroot -- change root directory

SYNOPSIS
     chroot [-u user] [-g group] [-G group,group,...] newroot [command]

DESCRIPTION
     The chroot utility changes its current and root directories to the supplied directory newroot and then exec's command, if supplied, or an
     interactive copy of the user's login shell.

     If the -u, -g or -G options are given, the user, group and group list of the process are set to these values after the chroot has taken
     place.

ENVIRONMENT
     The following environment variable is referenced by chroot:

     SHELL  If set, the string specified by SHELL is interpreted as the name of the shell to exec.  If the variable SHELL is not set, /bin/sh is
	    used.

SEE ALSO
     chdir(2), chroot(2), setgid(2), setgroups(2), setuid(2), getgrnam(3), environ(7), jail(8)

HISTORY
     The chroot utility first appeared in 4.4BSD.

BSD
								   June 7, 2003 							       BSD