PC https://classroom.udacity.com/courses/ud775/lessons/2980038599/concepts/33417185870923# Mac https://classroom.udacity.com/courses/ud775/lessons/2980038599/concepts/33331589510923
https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash
https://raw.githubusercontent.com/git/git/master/contrib/completion/git-prompt.sh
https://www.cyberciti.biz/tips/howto-linux-unix-bash-shell-setup-prompt.html