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Homebrew provides the GPG software in its catalog, so let’s install it now — it’s very easy!
After you’ve installed and run Xcode once, open a new terminal and type in the following:. Think of it like the Mac App Store: you choose software and install it from Homebrew. You won’t find Candy Crush on Homebrew — its catalogue only lists apps for developers and sysadmins. GNU Privacy Guard is an open-source data encryption software that provides privacy and authentication for data communication — basically, it keeps messages safe.
You may need to re-enter your user password and click accept and/or install on a message box. The version of Ruby that we’ll be using will be installed through another app called RVM.
Before you can deploy your app on the production server, you need to install Ruby.
In this tutorial we recommend that you use Ruby Version Manager (RVM) for this purpose.