By Seth T. Ross, from McGraw-Hill. Excerpt from the book that includes an introduction to UNIX, an introduction to computer security, a discussion of open-source security software, ten general security rules, and a bibliography. http://www.albion.com/security/
Focusing on the four most popular Unix variants today--Solaris, Mac OS X, Linux, and FreeBSD. Includes table of contents, errata, and sample chapter http://www.oreilly.com/catalog/puis3/