visionmedia/git-extras — pull request #168 by js-coder (2013-03-03 15:26:59+00:00)
Title: git-repl: Execute a shell command, if prefixed with !

Execute a shell command, if the command is prefixed with `!`, just like git
aliases.

I think this is pretty useful, because I usually have the repl opened, and the usual shell prompt in another tab, so this is quicker than switching tabs, for quickly looking things up.