How to make a startup script in ubuntu

Create a Startup Script in Ubuntu
Step 1
Make a script as you need .(example vtest.sh)

Step 2
Copy that file(vtest.sh) to /etc/init.d directory.

Step 3
run follwing command to make the permission of the file.
sudo chmod +x /etc/init.d/vtest.sh

Step 4
run follwing command to add script to startup
sudo update-rc.d vtest.sh defaults


OK you are done :-).Now restart the machine & It ll run the script at startup.

When you want to remove it from Startup
run following command
update-rc.d -f vtest.sh remove