chroot



CHROOT(8)                   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.  Additional settings may be applied
             as specified in login.conf(5) depending on user's login class.


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

     ldd(1), group(5), login.conf(5), passwd(5), environ(7)


HISTORY

     The chroot utility first appeared in 4.3BSD-Reno.


CAVEATS

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

OpenBSD 6.4                   September 12, 2015                   OpenBSD 6.4

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