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The first step is to download and install Git. Git is entirely free, and can run on machines using Windows, Mac and Linux operating systems. Based on your operating system, the specific process to install Git will vary slightly. Rather than repeat the installation instructions that are already widely available on the web, we will instead point you to some some existing installation guides that we recommend:
to install Git on a Mac, go to http://alvinalexander.com/mac-os-x/how-install-git-mac-os-x-osx
to install Git on Windows, go to http://msysgit.github.com/
many distributions of Linux come with Git pre-installed, but if that’s not the case for you, you can download it from http://git-scm.com/download/linux