chroot
chroot - make directory new root for path lookups
chroot FILENAME
This function works as the system call by the same name: it makes the
named directory the new root directory for all further pathnames that
begin with a ``/'' by your process and all of its children. (It doesn't
change your current working directory is unaffected.) For security
reasons, this call is restricted to the superuser. If FILENAME is
omitted, does chroot to
$_
.