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

chroot — change root directory

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

The chroot command changes its root directory to the supplied directory newroot and exec's command, or, if not supplied, 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.

The following environment variable is referenced by chroot:

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.

ldd(1), chdir(2), chroot(2), environ(7)

The chroot utility first appeared in 4.4BSD.

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

MOUSE August 13, 2011 CHROOT(8)