title: Delete all the content from file
body: <p>I want to remove the content form the list of files.</p>
  
  <p>EDIT :</p>
  
  <p>I have list of files.</p>
  
  <p>file1
  file2
  file3</p>
  
  <p>Those file containing bunch of lines ...</p>
  
  <p>I want to remove all the lines from each files.</p>