title: How to merge log files and sort by time
body: <p>I have many log files, like that</p>
  
  <p><strong>log file 1</strong></p>
  
  <pre><code>2016-09-11_19:40:15.537#15437 [INFO] A1
  2016-09-11_19:40:15.537#15437 [WARN] A2
  2016-09-11_19:40:15.542#15437 [INFO] A3
  </code></pre>
  
  <p><strong>log file 2</strong></p>
  
  <pre><code>2016-09-11_19:40:15.537#437 [INFO] B1
  2016-09-11_19:40:15.540#437 [INFO] B2
  </code></pre>
  
  <p>I wish I can merge them by script or other method like that 
  <strong>sort by time</strong></p>
  
  <pre><code>2016-09-11_19:40:15.537#15437 [INFO] A1
  2016-09-11_19:40:15.537#15437 [WARN] A2
  2016-09-11_19:40:15.537#437 [INFO] B1
  2016-09-11_19:40:15.540#437 [INFO] B2
  2016-09-11_19:40:15.542#15437 [INFO] A3
  </code></pre>
  
  <p>How do I to merge the files with efficient way ?
  thanks !</p>