Kernel, Cron, and User Administration for Red Hat Certified Engineer
Kernel, Cron, and User Administration, Part 1This tutorial and part 2 of this tutorial comes form chapter five of Red Hat Certified Engineer Linux Study Guide (Exam RH302), fourth edition, by Michael Jang. (McGraw-Hill/Osborne, 2004, ISBN: 0-07-225365-7).
I know I usually focus on the LPI exams, but the fact of the matter is that the LPI exams are the starting point for Red Hat's & Novell's certifications, and any information which can be collected for those exams will help out later down the road.
Also the devshed.com site has some good information on a variety of topics that Linux admins would need, along with excerpts from a variety of books.

<< Home