title: To get the current $USER in LaTeX
body: <p>My friend has the following in his computer in a LaTeX document</p>
  
  <pre><code> \includegraphics[width=13.0cm]{/Users/max/Dropbox/2_user_cases.png}       
  </code></pre>
  
  <p>I would like to have a variable for the username such that we can collaborate faster.</p>
  
  <p><strong>Pseudo-code about what I wont</strong></p>
  
  <pre><code> \includegraphics[width=13.0cm]{/Users/`echo $USER`/Dropbox/2_user_cases.png}       
  </code></pre>
  
  <p><strong>How can you have such an command inside LaTeX?</strong></p>