While the writers of this series of books don't ignore the philosophy of systems and network administration, they are definitely practical, hands on, commandline books at their heart.
If you're looking for what and why, rather than when and how, you should really check out (if you haven't already seen it), The Practice of Systems and Network Administration, by Limoncelli, Hogan, and Chalup, or TPOSANA. This book tells you almost nothing about what to type at the command line; it's focus is at 30,000ft, rather than 500. And it is *excellent*; anyone who's anywhere near admin management or supervision, even informally, should read it every 6 months.