Just thought I'd post this for all those out there that are new to the Linux environment, especially command line interface.
I first started trying to learn this stuff about 2 years ago because a lot of products I work on at work use embedded linux and I didn't like just blindly copy/pasting commands when I didn't know what they were doing. If I knew about this page then it would have saved me so much time. After skimming it I'm finding stuff I didn't know too so even if you're somewhat "established" in Linux you may want to give it a read.

http://linuxcommand.org/learning_the_shell.php

Cheers

PS Note that this is a general guide and not Chumby specific but it should all apply.