* To spawn a superuser shell (Just a little tip. Nothing important

):
sudo -s (very similar to sudo su)
(I'm guessing that you want to extract the files and edit them as user chris so you really want 2 separate scripts)
* create the 2nd script without the "sudo " stuff,
chmod +x script2 (I'll guess you already knew that)
* This is how you execute the script as root (you can have a shell window open so you'd not have to type in your password all the time):
sudo ./script2 (Execute "script2" located in the present directory)