This is a collection of utilities for listing, stopping, and doing other
various things with jails.

  - injail: to determine if process is running in a jail
  - jails: lists all the running jails
  - jid: translates jail ids to jail host names and vice versa
  - jkill: shutdown or restart a jail
  - jps: lists processes running in a jail
  - jstart: secure replacement for the jail command

WWW: http://thewalter.net/stef/freebsd/jails/jailutils/