In fact it tell much more than terminal and command line command. Worth to take a look.

Part 1 - Introduction, talk about sudo and kill command: http://www.macdevcenter.com/lpt/a/5916

Part 2 - Talk about file system and remote access (ssh and rsync): http://www.macdevcenter.com/lpt/a/5977

Part 3 - Cover various network tool like ping and whois: http://www.macdevcenter.com/lpt/a/6015

Part 4 - Shell script 101: http://www.macdevcenter.com/lpt/a/6181

Part 5 - start up tasks and periodic tasks: http://www.macdevcenter.com/lpt/a/6332