Does Mac OS X use Linux?

Mac OSX is built on top of BSD. http://en.wikipedia.org/wiki/OS_X

Linux classes, in my opinion, are just fine and would enable you to be comfortable with the command line. The caveat is that there are differences such as the output or availability or options of commands. Instance is “ps”. The system libraries, the folder structure are also different. Also note if you ever work on a *NIX server machine, invariably that would be linux. Note, there are no OSX servers anymore.

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