title: /usr/bin/perl: bad interpreter: Text file busy
body: <p>This is a new one for me:  What does this error indicate?</p>
  
  <pre><code>  /usr/bin/perl: bad interpreter: Text file busy
  </code></pre>
  
  <p>There were a couple of disk-intensive processes running at the time, but I've never seen that message before&mdash;in fact, this is the first time that I can remember getting an error when trying to run a Perl script.  After a few seconds of waiting, I was able to run it, and haven't seen the issue since, but it would be nice to have an explanation for this.</p>
  
  <p>Running Ubuntu 9.04, file system is ext3. </p>