Linux command reference

My friend is going to take a Linux certificate examination, he print out some documentation for reading purpose. I just glance through, it look so familiar to me. I take a search on the internet. Yes, those Linux command documentation is taken from linuxfab.cx, which some of those command description are written by me, just a few, I don't really remember which one is really done by me, I think 'compress' is just one of those. Rollaned not really make linuxfab a success, but what he have a right goal in mind, and he really make it happen. He want to write a linux command reference ebook, many writer (I am one of those people) on the website did constribute their part, now it is every where. link:- cngnu.org compress