Ah, the command-line! Refuge for the scoundrel, proving ground for the true expert, tool of choice for the power-user.
The following 10 tips explain how to do cool and interesting things at the command-line. They’re not specific to Ubuntu but they were written with Ubuntu in mind, and have not been tested on other distros. But all should work on most versions of Linux or even Unix.
10 fun and/or useful things to do at Ubuntu’s command-line — Ubuntu Kung Fu