Freebsd Internals

"Don't look now, but your fingerprints are all over the cover of this book. Simply picking it up off the shelf to read the cover has left a trail of evidence that you were here.
"If you think book covers are bad, computers are worse. Every time you use a computer, you leave elephant-sized tracks all over it. As Dan and Wietse show, even people trying to be sneaky leave evidence all over, sometimes in surprising places.
"This book is about computer archeology. It's about finding out what might have been based on what is left behind. So pick up a tool and dig in. There's plenty to learn from these masters of computer security."
–Gary McGraw, Ph.D., CTO, Cigital, coauthor of Exploiting Software and Building Secure Software
"A wonderful book. Beyond its obvious uses, it also teaches a great deal about operating system internals."
–Steve Bellovin, coauthor of Firewalls and Internet Security, Second Edition, and Columbia University professor