Caldera OpenLinux Unleashed

I recently picked up this book at Half-Price books, a very good deal. It has a huge section on sysadmin and half of that is security. A good read for any linux user since most of the tools are in any flavor of Linux. I think my version is a little outdated (2000) but I recommend looking for it if you're using Caldera. :D

Yes, it's a SPECTACULAR book. I got it a while back when I got my first version of Caldera OpenLinux 2.3 (what I'm using now) and read the entire thing. It's very very very good, and costed me about 10 dollars with the cd and all. :)