title: Can't run git diff --dirstat=files,10,cumulative HEAD^..HEAD
body: <p>I want to know change status of directory with percentage. So I run like following</p>
  
  <h1>case 1</h1>
  
  <pre><code>$ git diff --dirstat=files,10,cumulative HEAD^..HEAD
  usage: git diff [&lt;options&gt;] [&lt;commit&gt; [&lt;commit&gt;]] [--] [&lt;path&gt;...]
  </code></pre>
  
  <h1>case 2</h1>
  
  <pre><code>$ git diff --dirstat=11 HEAD^..HEAD
    76.8% api/
    13.0% data/fonts/
  </code></pre>
  
  <p>I have tested this under git 1.7.5.4 and 1.7.0.4. But I don't know why case 1 is not correct command. I checked git diff man page <a href="http://goo.gl/GPU49" rel="nofollow">http://goo.gl/GPU49</a> also git config for diff.dirstat but I can't do it correctly.</p>
  
  <p>Do you have any opinion?</p>