Useful/fun terminal commands

[bgappleguy]

DOES anyone know some fun or useful terminal commands? (pls. don't post repeats).
THANKS!
-guy

[phatlip]

You can play Tetris in terminal through emacs. Kind of cool.

1) Type emacs
2) Hit enter
3) Hit the escape key
4) Press the letter x, you'll see "M-x" appear in the lower left corner
5) Type tetris, then hit enter

It also works for other games such as pong, snake etc.

[computoman]

if you have a news reader, you may want to add this one:

http://feeds2.feedburner.com/Command-line-fu

[gus]

Here's some useful ones:
http://www.macosxtips.co.uk/index_files/terminal-commands-for-hidden-mac-os-x-settings.html