Change folder permission

Reference:

  1. 鳥哥
    http://linux.vbird.org/linux_basic/0210filepermission.php
  2. chown、chgrp和chmod的用法
    https://www.itread01.com/content/1523008588.html
  3. https://askubuntu.com/questions/30629/how-can-i-recursively-change-the-permissions-of-files-and-directories
  4. https://en.wikipedia.org/wiki/Ls