In today's release of GitHub for Mac, you can now easily install Git for use on the command line, without needing to download any separate packages. And whenever we update the version of Git included with GitHub for Mac, you'll get the changes automatically – no work required on your part!
After updating the app, you may notice some changes to the Preferences window. On the newly renamed "Advanced" tab, simply click "Install Command Line Tools":
You'll be prompted for an administrator password so that Git can be installed
/usr/local/bin, and then you should very shortly see that it succeeded:
If you're using GitHub for Mac for the first time, and want to install Git, you can also set it up from the welcome screen:
Once installed, you can open up Terminal.app and run
git commands to your
heart's content. Command line aficionados, rejoice!
Update: We've since removed the ability to install Git from GitHub for Mac, because OS X Mavericks and later includes a version of Git already.