Update git on mac

There is git-osx-installer. You can subscribe to the feed on that page and get notified about future releases.

You may try MacPorts (or Homebrew or Fink) for Mac OS, which is similar to apt-get etc. on linux. It is often better to use a package manager than compiling things by hand as you can update packages with "sudo port update outdated".

I think you can move git around on your hdd as long as the destination is in your path. MacPorts installs to /usr/local/bin, I think. To avoid confusion, you may uninstall/delete your version before installing git via a package manager.