Debian
# cat /usr/sbin/update-bootsystem-insserv
#!/bin/sh
#
# Author: Petter Reinholdtsen
# Date: 2009-08-04
#
# Transition script only to be used by sysv-rc version 2.87dsf-2 if
# insserv is upgraded without sysv-rc being upgraded too.

set -e

case "$1" in
enable|'')
exit 0
;;
check)
exit 1
;;
*)
echo "error: Unknown argument '$1'"
exit 1
;;
esac

exit 0

интересно это у дебианщиков юмор такой что ли? :)