title: How do I open a specific port on OS X Yosemite from the command line?
body: <p>I cannot seem to find anywhere how to open a specific port on OS X Yosemite. I understand that I can use 'Little Snitch' in order to open a port, but I would love to do it from the command line.</p>
  
  <p>This is for a Firewall port.</p>