I just bought "Linux Pocket Guide" by Daniel J. Barrett. It's exactly what you're looking for. Its pretty small in size compared to other reference guides out there and covers hundreds of commands giving a short description, what they do, and common options and explainations. I've used it from everything from remembering what order the files go in for the 'ln' command and memorizing the syntax of scp to just browsing it looking for useful commands. Although it says, "Covers Fedora Linux" all that means is that it has some commands like up2date and rpm, I've been using it for Gentoo and it has worked fine. I'd highly recommend it.
Last edited by Baix; 07-02-2005 at 02:09 PM.