writing a shell script

I want to write a shell script that can check if my Azureus downloads are completed, then exit Azureus and shut down my PC. can anyone point me to a website or some resource that might help me out with this?

There is a masive amount of bash scripting books and online resources, just google bash scripting. It depends on your learning style I liek by example stuff. Here is a pretty in depth write up
http://www.tldp.org/LDP/abs/html/