Unix reference (click to download) – A great Printout Unix Reference – found on Fosswire.com.
Terminal/Unix tutorials
http://smokingapples.com/software/tutorials/mac-terminal-tips/
http://guides.macrumors.com/Terminal
http://www.lynda.com/Mac-OS-X-10-6-tutorials/Unix-for-Mac-OS-X-Users/78546-2.html