Git missing after OSX migration
Best Guess - your path variable got re-written.

From the the terminal enter: sudo find / -name git

You should see every instance of git on your system. Assuming the git binary is located, make sure its directory is in your path, or instead of typing git init you could type /path/to/git (assumes git binary is ia /path/to).

Alternatively, you could re-install git. Should not affect your repositories. Just make sure the resultant binaries are in your path.