osx 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 command changes its root directory to the supplied directory newroot and exec's command, if supplied, or an interactive copy of
     your 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.  See setgid(2), setgroups(2), setuid(2), getgrnam(3) and getpwnam(3).

     Note, command or the shell are run as your real-user-id.

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), environ(7)

HISTORY
     The chroot utility first appeared in 4.4BSD.

SECURITY CONSIDERATIONS
     chroot should never be installed setuid root, as it would then be possible to exploit the program to gain root privileges.

4.3 Berkeley Distribution					  October 6, 1998					 4.3 Berkeley Distribution