title: Executing terminal commands in Jupyter notebook
body: <p>I am trying to run the following in Jupyter notebook (with Python 2 if it makes a difference): </p>
  
  <p><code>!head xyz.txt</code></p>
  
  <p>and I get the following error:</p>
  
  <blockquote>
    <p>'head' is not recognized as an internal or external command, operable
    program or batch file.</p>
  </blockquote>
  
  <p>Is there anything I need to import to be able to do this?</p>