one doesn't have to learn shell scripting, as all the previous answers indicate; but learning is never a bad thing. it's really a question of personal priorities. it's very hard for someone else to tell you what is and isn't worth your time.
most programmers find that learning new languages gets incrementally easier each time. (the same is largely true of natural languages too.) and the earlier you start, the better.
plus: having learned a language enables you to extravagantly diss its limitations from a position of complete knowledge and familiarity. this probably won't get you laid, but might earn you a beer from your peers!
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