title: Fastest way to find Duplicate folders in linux
body: <p>What is the fastest way to find Duplicate folders in linux file system?<br/>
  this is my idea, I know that it's not Efficient.<br/>
  here it's small sudocode of it:</p>
  
  <pre><code>start from on directory named d1
  put file names in d1 into an array.
  for i in array
  do
     node=`find -iname $i`
     father=father of node
     check if the $father is that specific directory.
  done
  </code></pre>
  
  <p>It's not complete.<br/>
  what is the most Efficient way to do this?</p>