Some of the books I recommend are:
 
 Unix for Dummies - isbn 1-878058-58-4 (intro class - not a reference tool - EXCELLENT)
* A practical guide to the UNIX System - Sobell - 0-8053-7565-1 (intro & intermediate - EXCELLENT)
 Unix Sys Admin Handbook - isbn 0130206016 (Sys Admin - generic - EXCELLENT)
* UNIX Power Tools - isbn 0-679-79073-x (intermediate and Sys Admin - EXCELLENT)
* HP Certified - isbn 0-13-018374-1 (sys admin / advanced - EXCELLENT)
 A practical guide to Solaris - Sobell - 020189548x (intro & intermediate - EXCELLENT)
 A Practical Guide to Linux - Sobell - isbn 0201895498 (intro & intermediate)
 Unix Haters Handbook - isbn 1-56884-203-1 (advanced & Sys Admin - optional)
 Solaris Solutions for System Administrators - isbn 0-471-34810-4 (Sys Admin)
* UNIX in a Nutshell - isbn 1-56592-001-5 (intro / intermediate - reference only)
 
* - have used as a text for a class

 (the O'Reilley books are usually pretty good, but 
the Sys Admin book by Frisch is useless for detailed admin use, 
the NIS/NFS book has many errors, the Sendmail book doesn't cover 
relay hosts and others are just filled with fluff. You have to 
examine each one and make your own decision.)

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