title: fatal: No HEAD commit to compare with (yet)
body: <p>I am newbie with git. It tried <a href="http://www.kernel.org/pub/software/scm/git/docs/gittutorial.html" rel="nofollow noreferrer">this</a> tutorial, but after the command, i get this error:</p>
  
  <pre><code>[root@WL-0022150E7BD4 alma]$ git diff --cached
  fatal: No HEAD commit to compare with (yet)
  </code></pre>
  
  <p>I created two file in the current directory. I dont understand, it is the first step in the tutorial.</p>