title: Get length of .wav from sox output
body: <p>I need to get the length of a .wav file.</p>
  
  <p>Using:</p>
  
  <pre><code>sox output.wav -n stat
  </code></pre>
  
  <p>Gives:</p>
  
  <pre><code>Samples read:            449718
  Length (seconds):     28.107375
  Scaled by:         2147483647.0
  Maximum amplitude:     0.999969
  Minimum amplitude:    -0.999969
  Midline amplitude:     0.000000
  Mean    norm:          0.145530
  Mean    amplitude:     0.000291
  RMS     amplitude:     0.249847
  Maximum delta:         1.316925
  Minimum delta:         0.000000
  Mean    delta:         0.033336
  RMS     delta:         0.064767
  Rough   frequency:          660
  Volume adjustment:        1.000
  </code></pre>
  
  <p>How do I use grep or some other method to only output the value of the length in the second column, i.e. 28.107375?</p>
  
  <p>Thanks</p>