clMac OS X UNIX Toolbox: 1000+ Commands for Mac OS X Power Users
/ Thomas Myer, Wiley, 2009

This is a guide for Mac users and admins who will be venturing beyond the friendly configuration windows and using the command line. The book is a re-spin of the book BSD Unix Toolbox by Christopher Negus. 200 pages.

BSD UNIX toolbox

BSD UNIX toolbox : 1000+ commands for FreeBSD, OpenBSD, and NetBSD power users / Christopher Negus and Fran├žois Caen

Good, a book on BSD. I have been waiting for this, because most books of this type feature Linux, and BSD deserves more attention. This book is slim at 300 pages, and will be useful for beginner and intermediate admins. Much of the content also applies to Linux and Unix.