title: git diff between specific commit and local file
body: <p>I've looked for the answer but couldn't find it on stackoverflow, so I ask it here.<br>
  Let's assume I have some local changes since the last commit(and push) and I want to git diff of a file between a specific commit(several commits ago) and my current local version.<br>
  I mean, for example, I can see the difference of a file between two specific commits by   </p>
  
  <pre><code>git diff COMMIT1 COMMIT2 src/testsuites/file1.c  
  </code></pre>
  
  <p>But I want to see the difference between COMMIT1 and local file.
  How do you do that?</p>