Use this hands-on; step-by-step reference book to learn UNIX and Linux. --

A Self-Instructional Introduction to the System for Those with No Prior Computer Experience

This comprehensive, one-semester introduction to Unix, used at Stanford University, incorporates sound pedagogy along with all the necessary reference material.

“As an author, editor, and publisher, I never paid much attention to the competition—except in a few cases. This is one of those cases. The UNIX System Admi