title: 'ls' is not recognized in Anaconda Python 2.7 Spyder
body: <p>I run my codes in Anaconda Spyder Python 2.7 for Windows 7 64bits.</p>
  
  <p>But when I run this code:</p>
  
  <pre><code>!ls -lh ./training3.crfsuite
  </code></pre>
  
  <p>I received this error:</p>
  
  <pre><code>'ls' is not recognized as an internal or external command, operable program or batch file.    
  </code></pre>
  
  <p>Does anyone know why?</p>
  
  <p>Thank you.</p>