Como converter.xls para.csv em perl? qual é o módulo para isso? Existe algum exemplo disso? qual é a melhor maneira de converter?

use Spreadsheet::ParseExcel;
my $xlsparser = Spreadsheet::ParseExcel->new();
my $xlsbook = $xlsparser->parse('/home/Admin/Downloads/abc.xls');
my $xls = $xlsbook->worksheet(0);
my ( $row_first, $row_last ) = $xls->row_range();
my ( $col_first, $col_last ) = $xls->col_range();
my $csv = '/home/Admin/Downloads/ram.csv';
for my $row ( $row_first .. $row_last ) {        # Step through each row
    for my $col ( $col_first .. $col_last ) {    # Step through each column
        my $cell = $xls->get_cell( $row, $col ); # Get the current cell
        next unless $cell;
        $csv .= $cell->unformatted(); # Get the cell's raw data -- no border 
                                      # colors or anything like that
        if ($col == $col_last) {
            $csv .= "\n"; 
        } else {
            $csv .= ","; 
        }
    }
}
open(my$FH ,'>',"$csv") or die "oops!";

while (my$line = <$xlsbook>){
    print $FH $line;
}

oops! na linha 23 do csv.pl.