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as part of the compulsory subjects to study, as well as a couple of Unix courses, in the IT certifications.

I've also found some good Linux reference works in good bookshops, those that carry the O'Reilly publications and the McGraw Hill ones are good.

I use and recommend Zorin OS as it's based on Ubuntu but has a few steroids added, especially in the GUI area where it has a range of GUIs so you can look at what looks like Win 2000, Mac OS, Win XP, Win 7, and many others.