title: How to run system command in Cake build?
body: <p>I couldn't find any information related with running custom system command on this site: <a href="http://cakebuild.net/dsl/" rel="noreferrer">cakebuild.net/dsl</a></p>
  
  <p>How can I do it?</p>
  
  <hr>
  
  <p>The real command I want to run is 'upx mproject.exe'</p>