This content was released on Jan 4 2018. The official support period is 6-months from this date.
No need to keep a command line prompt open. With Xcode 9, we get better source control management with GitHub integration built right in to the IDE.
This is a companion discussion topic for the original entry at https://www.kodeco.com/4107-what-s-new-in-xcode-9/lessons/2