title: Git: Is it possible to produce an output showing which commits differ between two branches?
body: <p>I want to be able to do something like a git diff between two branches, but show the commit ids of which commits exist on one branch but not the other. (And vice-versa.)</p>
  <p>Adding to the complexity, I also need to be able to see who authored these commits.</p>
  <p>Is such a thing possible?</p>