title: Git search all diffs
body: <p>I'm trying to search for changes in my git history relating to a very specific variable name.</p>
  
  <p>I've tried doing this:  </p>
  
  <pre><code>git diff HEAD~25000 | grep -in mydistinctvariablename
  </code></pre>
  
  <p>The results don't tell me which commit the result lines are from and it takes quite a bit of time (about 5-7 minutes).</p>
  
  <p>Does anyone have a better solution, time and results wise?</p>