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

NAME
     chroot - change root directory

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

DESCRIPTION
     The chroot command changes its root directory to the supplied directory
     newroot and executes command, if supplied, or an interactive copy of the
     user's shell.

     The chroot command is restricted to the superuser.

     The options are as follows:

     -g group,group,...
             Override the primary and supplemental group IDs.  The primary
             group ID is set to the first group in the list.  Any remaining
             groups are placed in the supplemental group ID vector.  Each
             group listed must exist in the group(5) databases.

     -u user
             Set user ID to user (which must exist in the passwd(5) database).
             The primary and supplemental group IDs will be set based on the
             user's entries in the passwd(5) and group(5) databases unless
             overridden by the -g option.

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

SEE ALSO
     chdir(2), chroot(2), setgid(2), setgroups(2), setuid(2), group(5),
     passwd(5), environ(7)

HISTORY
     The chroot utility first appeared in 4.4BSD.

CAVEATS
     chroot should never be installed setuid root, as it would then be possi-
     ble to exploit the program to gain root privileges.

OpenBSD 4.7                      May 31, 2007                                1
