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  1. or download this
    $newfile = "0001";  # Initialize to 0001
++$newfile;         # Now contains 0002
  2. or download this
    $newfile = "0001";                       # Initialize to 0001
$newfile = sprintf("%04d", $newfile+1);  # Now contains 0002
  3. or download this
    $newfile = "0001";  # Initialzie to 0001
$newfile += 1;      # Now contains 2