title: rsync diff but with filter on certain file extension only
body: <p>I am trying to perform diff on sub-directories that includes certain file extension only. </p>
  
  <p>Below is my folder structure</p>
  
  <pre><code>GRADES
    --test1
        --file1.pdf
        --file2.pdf
    --test2
         -T60_Hello.xml
    file123.pdf
    T60_Hello.xml
    T61_Hello.xml 
   --test3 (this folder would contain everything except files with extension .xml)
  </code></pre>
  
  <p>What i want to do is when i perform diff from GRADES (src) to Test3(dest) then i want to include only files with following filter - <code>T60_*.xml</code>  </p>
  
  <p>Below is my script -</p>
  
  <pre><code>rsync -rvcm --include='T60_*.xml' /Users/Desktop/GRADES/* /Users/Desktop/GRADES/test3
  </code></pre>
  
  <p>At the moment i am getting all files that are not in Test3 folder.</p>