Hacking Linux Exposed: Osbore Publshing (http://www.osborne.com)
Written By: Brian Hatch
James Lee
George Kurtz
Price: 39.99 USD
ISBN: 0-07-212773-2

I got this book a while back but I only finished reading it about a week ago, this really isnt the kind of book you read... But the kind of book you refer to in case you have a problem. The book lists different types of access to computers (physical, remote, social engenering) and how a hacker could exploit that way of access against your computer. The book also comes with examples of hacks and code to help you stop that hack from being used against your system.... I would reccomend this book to any *nix administrator