Autocomplete for git commands and branch names

git_autocomplete

Taken from this page: http://code-worrier.com/blog/autocomplete-git/

Step 1: download this bash script (make sure to name it ".git-completion.bash"):
https://github.com/git/git/blob/master/contrib/completion/git-completion.bash.

You can run this curl from your home directory to download it directly:
curl https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash -o ~/.git-completion.bash

Step 2: Place the file in your home directory

Step 3: add the following lines to your .bash_profile:
if [ -f ~/.git-completion.bash ]; then
  . ~/.git-completion.bash
fi

Step 4: Close all Terminal windows and reopen. If it still doesn't work, make the script executable:
chmod -X ~/.git-completion.bash  (per this reference: http://apple.stackexchange.com/questions/55875/git-auto-complete-for-branches-at-the-command-line)

Then restart Terminal.

You should now be able to use tab to autocomplete git commands and branch names, just like files and directories.