title: How to diff two local repositories
body: <p>I have two repos that I've downloaded to my local machine (as .zip files that I unzipped) that are in separate folders. The contents are virtually the same, but there are thousands of files in them. </p>
  
  <p>Is it possible to use Git to compare across them and find those minute changes? I suspect there are a handful of changes across 5-6 files but I need to find them.</p>
  
  <p>I do have them both in Github if working with the uploaded versions is easier. If it matters (and I suspect it doesn't), my local environment is a Mac.</p>
  
  <p>Note: Neither of these repos is a fork of the other. (One is a fork of a friend's repo; both repos share a recent common origin that we forked from)</p>