title: Open "Opt" folder with Terminal on Mac
body: <p>So here is a simple question whose answer has proved elusive. I recently installed a folder that I need to add some files to. The folder is stored in the "opt" folder I thought it would be as simple as:</p>
  
  <p>myusername ~/opt/foldername</p>
  
  <p>But I can't seem to find "opt". I can view the files in Finder, but I need to create some files and I'd rather do that on the command line. Can anyone give me some tips for accessing it?</p>