title: Windows batch file read text file and convert all to uppercase
body: <p>I just simply want to replace all the text in the text file convert to uppercase.</p>
  
  <p>For example of abc.txt</p>
  
  <p>[Before conversion]
  First Name, Last Name, Full Name
  Brad, Pitt, Brad Pitt</p>
  
  <p>[After conversion]
  FIRST NAME, LAST NAME, FULL NAME
  BRAD, PITT, BRAD PITT</p>
  
  <p>Is that possible??</p>