title: check duration of audio files on the command-line
body: <p>I need to check the duration of a group of audio files.
  Is there a simple way to do this on the unix command-line?</p>
  
  <pre><code>&gt; duration *
  </code></pre>
  
  <p>I have the amazing SoX app which has an option called stats that generates a set of audio info including duration. I am looking for a way to get only duration.
  I am flexible on output format, could be any of sample length, hh:mm:ss, or seconds.
  The latter would be my preference. </p>