# TWO LINES IN THE FILE MEET THE FOLLOWING CRITERIA:
  print "ends CRLF\n" if /F\x0D\x0A$/;
  print "ends CRLF\n" if /F\r\n/;
  print "contains CR\n" if /\x0D/;
  print "contains CR\n" if /\r/;

  # AND THE OTHER TWO LINES IN THE FILE MATCH THIS:
  print "ends LF only\n" if /F\x0A$/;