Got a shell script that you want automatically run at bootup on Ubuntu Server Edition? Here’s how:
Create a script in the “/etc/init.d/” directory.
Make the script executable
$ sudo chmod +x /etc/init.d/myscript.sh
Make the script execute at startup
$ sudo update-rc.d myscript.sh defaults
Note: The option “defaults” puts a link to start your script in runlevels 2, 3, 4 and 5, and puts a link to stop in runlevels 0, 1 and 6.