title: How to edit the sudoers file when it has nothing and has no permission?
body: <p>I login with non-root user, e.g. jason, and can not edit the /etc/sudoers file.
  After type "ls -la /etc/sudoers", it shows following:</p>
  
  <pre><code>-r--r----- 1 root root 792 Jan  6 06:31 /etc/sudoers
  </code></pre>
  
  <p>And type "vi /etc/sudoers", the file shows nothing, it is empty.
  However I have no permission to edit it, and also cannot become a root user.</p>
  
  <p>How to edit the sudoers file to edit the "jason" user?</p>