title: Change permission folder in Raspberry Pi to R permission
body: <p>The image below contain the command that change the permission for folder:</p>
  
  <p><a href="https://i.stack.imgur.com/U9IVI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/U9IVI.png" alt="enter image description here"></a></p>
  
  <p>I want to change permission folder in Raspberry Pi to <code>r</code> permission it is folder for radio in <code>/var/www</code>. It failed and said <em><code>"chmod: invalid mode: '-R' try chmod :--help to more information"</code></em>.</p>