Linux secrets

I will be posting here Linux secrets commands that are not very well known


Space Invaders

OpenOffice.org 2.0/OpenOffice.org 3.2.1 
there's an entire game hidden in OpenOffice.org Calc. Open a new worksheet, and in any cell, type in the formula:
=game("StarWars")

and press Enter. You should see a Space Invaders-style arcade game.

Signature in ASCII graphics 

A sample output. ( press CTRL-D after you type the message)

$ boxes -d peek
STELIOS AGAPIOU
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