Add script to run at bootup in Ubuntu...

Steps as follows:
1. First of all, give your script-file executable permissions.

user@localhost:~$ chmod +x script-file.sh

2. Move your script-file to /etc/init.d directory.

user@localhost:~$ sudo mv script-file.sh /etc/init.d

3. Update Init script links, by running following command

user@localhost:~$ sudo update-rc.d script-file.sh defaults

Remember, these steps would help you run a script on bootup, NOT AT LOGIN.

When you append, your commands in ".bashrc" file. In this case, the commands will be executed when that particular user is logged in.

There is difference.

..............Done!!!