I'm a Program Manager for version control in Microsoft Visual Studio Team Services and the co-maintainer of the libgit2 project, the Git repository management library that underpins tools like GitHub, Visual Studio and Xcode. I also develop version control tools and I also write and speak about Git and version control.
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Years of working with large networks of Unix machines has taught me to version control my dotfiles so that I can get up and running on any new machine quickly. I keep my dotfiles checked in to a git repository, except for the truly important ones - the ones that I need to keep secure, like my SSH keys - which I keep with me.