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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.

NetBSD-9.2 August 13, 2011 CHROOT(8)