Run anything on startup in ubuntu

Sometimes we might want some set of things to happen on startup. If it is a simple application/script we can simply add to startup applications. However this fails if we need to be root to run that. Today i will show you how it is done.
Say I want to mount a set of disk drives on startup.

1.  Open Terminal and type
   $ gedit mounter.sh
2. Type the set of commands you want to run on startup in this file. Here it is
   mount /dev/sda2 /home/alse/Ambusher
   mount /dev/sda3 /home/alse/C
3. Save and close the file. Now change permissions of the file.
   $ chmod +rwx mounter.sh
4. Then move it to /etc/init.d
   $ sudo mv mounter.sh /etc/init.d/
5. Add mounter.sh to rc.d
   $ sudo update-rc.d mounter.sh defaults

Now mounter.sh will run on startup.

Now I will show you how to remove something which you have already added

Suppose say i want to remove mounter.sh from rc.d. Type

$ sudo update-rc.d -f mounter.sh remove

Update:

Now you can just execute the script by adding in /etc/rc.local