ubuntu init.d runlevel update-rc.d

Ubuntu startup script
http://felix-lin.com/linux/debianubuntu-%E6%96%B0%E5%A2%9E%E9%96%8B%E6%A9%9F%E8%87%AA%E5%8B%95%E5%9F%B7%E8%A1%8C%E7%A8%8B%E5%BC%8F/

/etc/init.d/blah

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#! /bin/sh # /etc/init.d/blah #   # Some things that run always touch /var/lock/blah   # Carry out specific functions when asked to by the system case "$1" in   start)     echo "Starting script blah "     echo "Could do more here"     ;;   stop)     echo "Stopping script blah"     echo "Could do more here"     ;;   *)     echo "Usage: /etc/init.d/blah {start|stop}"     exit 1     ;; esac   exit 0

update-rc.d blah defaults

update-rc.d blah start 20 2 3 4 . stop 80 0 1 6 .
start 20th in 2/3/4 runlevel
update-rc.d -f blah remove