title: Give user permissions to specific folder ONLY
body: <p>I'm using Amazon Linux on EC2 and I just added the user using <code>sudo adduser john</code>.</p>
  
  <p>How can I give the user specific permissions to only ONE folder and all the sub folders in it? For example, they only have access to: <code>/var/www/html</code> and everything in it. How can I do that?</p>