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  1. or download this
    if ($id eq "") {
    $id=sprintf("%-*s",8,$prev_id);
...
else {
    $id=sprintf("%-*s",8,$prev_id);
}
  2. or download this
    $a=index($sub_line,'|',1);
$b=index($sub_line,'|',8);
$c=index($sub_line,'|',20);
  3. or download this
    $a=index($sub_line,'|');
$b=index($sub_line,'|', $a+1);
$c=index($sub_line,'|', $b+1);