title: Linux du command without traversing mounted file systems
body: <p>If the wording of the question is wrong, please let me know. It might explain why I can’t find an answer.</p>
  <p>I want to find the usage on my main disk using a command like:</p>
  <pre><code>du -sh /*
  </code></pre>
  <p>The problem is that I have a number of mount points at the root level, and I would like <code>du</code> to skip these.</p>
  <p>I thought the <code>-x</code> option was supposed to do this, but either I misunderstand what it does or I’m using it the wrong way.</p>
  <p>How can I apply <code>du</code> to only the root disk without traversing the additional mounts?</p>
  <p>Thanks</p>