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You would be better off getting a Linux box and learning the unix commands. They are more obscure, but Mac uses a flavor of Linux and many powerful script languages (Perl, Python) work well from the command line.
Go to Amazon and sign up for their "Cloud". Somewhere (I forget where) they have profiles that will create a virtual instance of RedHat or Debian or .. other flavors of Linux.
This gives you a real environment that disappears when you log off and you have zero risk of hurting anything.
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