Appendix A. Installing Ruby on Mac and Linux
Installing on Mac
New Macs ship with Ruby 2.0 already installed, so if you’re here, you’re likely using an older Mac that has Ruby 1.8.7. Not to worry! We’ll get you upgraded in a jiffy.
Open up your terminal and type the following code. (The $ just shows you where to start typing—don’t type the $!) This will install a tool called RVM (Ruby Version Manager) as well as Ruby 2.0.
$ \curl -L https://get.rvm.io | bash -s stable --ruby=2.0.0 --auto-dotfiles
Once you do this, you’ll see a whole bunch of text pop up to tell you that your computer is downloading Ruby. When it’s all done, close your terminal, reopen it, and enter ruby -v. You should see your computer print a response with ruby 2.0.0 in it!
If your ...
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