First let me say that SUN used to be and may still be a great OS but they seem to be on the way out... imho. Don't let me skew your opinion of SUN. Just my observations based on company actions...
Hehe please no flames from you SUN SAs...
Read this post for general unix links I have at the bottom.
NEWBIE Links!!
Most colleges are going to have you start with some basic Logic courses...called Problem solving, but you dont have to follow a program if you dont declare a major.
I would take an intro to unix course of some kind then take the followup to it. They usu cover the OS and loading packages and Os trouble shooting and some minor scripting for managing your system.
Many of these classes will teach using LINUX of some flavor. I woudl suggest loadingi an Linux partition on your home PC. You can get one for $30 at Barnes and Noble or any larger bookstore.
Then take a few scripting classes... Any Shell ksh/sh course will do. and maybe Perl... learning Awk/Sed...
Here are a few great books you can find used either online or local reseller...
"The AWK Programming language" by Aho/Kernigan/Weinberger ((AWK if you didnt know))
"Unix System Administrators Handbook" AKA "THE RED BOOK" by Nemeth/Snyder/Seebass/Hein...
"Unix in a Nutshell" by O'Reilly...