public function __construct()
 {
     parent::__construct('catdoc', '{$escape}{$cmd}{$escape} -w -d UTF-8 {$escape}{$sourcefile}{$escape} > {$escape}{$targetfile}{$escape}');
 }
 public function __construct()
 {
     parent::__construct('xls2csv', '{$escape}{$cmd}{$escape} -d UTF-8 -q 0 -c {$escape} {$escape} {$escape}{$sourcefile}{$escape} > {$escape}{$targetfile}{$escape}');
 }