title: sudo command is not working on mac os x
body: <p>When run <code>sudo</code> command anywhere in my terminal then I get following error</p>
  
  <pre><code>Zafars-MacBook-Pro:etc zafarsaleem$ sudo
  sudo: /private/etc/sudoers is mode 0755, should be 0440
  sudo: no valid sudoers sources found, quitting
  </code></pre>
  
  <p>I followed this <a href="http://instantaneousinstances.com/2012/07/fixing-sudo-on-mac-os-x-lion-10-7/" rel="nofollow">link</a> but when I ran <code>ls -al /</code> command I got following output for <code>.</code> which is not similar to the one in the link but stil I followed the whole tutorial but it didnt work and I am still getting above output after running <code>sudo</code> command. How can I fis this issue?</p>
  
  <pre><code>drwxr-xr-x    34 root         wheel      1224 Jan 22 07:43 .
  </code></pre>