there are many good online resources that explain how to do shell scripting. Here is one that I was looking at: http://www.livefirelabs.com/unix_tip_trick_shell_script/unix_shell_scrip...
and you can easily download tools like cygwin to give you a shell to play with. But it seems to me that your bigger question might be how to return to work in release management. That requires a little more effort but is very doable. In fact, - many companies are looking for release coordinators which can then lead to release engineering jobs.
Why don't you shoot me an email ([email protected]) with your resume and we can talk.
Bob Aiello, Technical Editor