title: How can I get chmod -R to work for me? (operation not permitted)
body: <p>When I try to do something like:</p>
  
  <pre><code>chmod -R ug+rw files
  </code></pre>
  
  <p>On a folder with existing content I get:</p>
  
  <p>chmod: Unable to change file mode on [fill in the blank]: Operation not permitted.</p>
  
  <p>It's on a site on my own computer (which I am the admin of). </p>