What does a Unix System Administrator do?

WTF is unix/linux??????????????

So I'm in the networking field trying to become a network administrator. now i'm almost at graduation point with a bachelor degree in network and system administration and I've at so many job application where companies require unix/linux knowledge. WTF is this? I've heard of it during my academics but never really worked on it? Is it really important? I mean what is it? is it a server? an OS? ...
Answer:

Unix and Linux are Operating systems and are standard for networks. In truth, it's absolutely astonishing that you could get to this point in your studies without been exposed to Linux or Unix. Your school owes you a refund. You can download and install Linux for free. http://en.wikipedia.org/wiki/Linux http://en.wikipedia.org/wiki/unix

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What is UNIX http://www.unix.org/what_is_unix.html What is Linux http://tldp.org/LDP/intro-linux/html/chap_01.html LUg.

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