title: tar command works but takes too long to finish
body: <p>I'm using the following command to export a single file called <code>file</code> (2.6KB once exported) from <code>archive.tbz</code>:</p>
  
  <pre><code>tar -xvf archive.tbz ./root/file
  </code></pre>
  
  <p>I see this output a few seconds after running the command</p>
  
  <pre><code>x itunes20150701/parental_advisory
  </code></pre>
  
  <p>but the command does not exit for a long time.</p>
  
  <p>When I check the exported file, it looks like it's been fully exported as soon as <code>x itunes20150701/parental_advisory</code> has been outputted.</p>
  
  <p>The command will eventually finish, but it's minutes later. What is causing the command to hang for so long, when it seemingly finishes the export of the file itself relatively quickly?</p>