chroot man page on OpenBSD

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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
     ldd(1), group(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 4.9			 July 8, 2010			   OpenBSD 4.9
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