You probably know this already but just in case it has somehow escaped your notice, the program "terminal" in the utilites folder in the applications folder gives you a unix command line on a Mac.
At least, close enough to unix that I (an admittedly very minor and occasional user of unix) can't tell the difference. I checked pwd cd and ls just now and they all work. I'm pretty sure I've used ps and kill -9 but nothing more sophisticated than that.
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