title: Remove duplicate line in text file
body: <p>I have searching around, but not able to get some auto script that perform overall tasks below:
  1) go through all text files from a folder</p>
  
  <p>2) remove duplicate line/row from the text file (text is already sorted, so can skip the sorting part)</p>
  
  <p>3) save &amp; overwrite the text files</p>
  
  <p>Unfortunately, all the result I searched only to remove line from 1 specific file, and save as another file name. </p>
  
  <p>Then i will set a schedule task to run this script.</p>
  
  <p>I don't have any script knowledge, only have few experience on batch script setup. Your help and guide would be much appreciated.</p>