What You’ll Need
The only thing you’ll need to follow along is a Ruby installation and a UNIX-like shell. You’ll need to have either Ruby 2.0 or 2.1 for all the examples in this book to work, and the bash shell is recommended (although we aren’t going to be seeing many shell-specific features). If you download the code from the book’s website,[1] you’ll notice at the top of the archive is a Gemfile. This should contain a list of all the gems you need to run the example apps, and you can use this file, along with Bundler,[2] to install everything in one step. If you don’t know what any of that means, don’t worry; the book will tell you when to install any needed gems. If things aren’t working right, you can use the Gemfile to see which versions ...
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