cronjob in cakephp 1.3

Hi guys,... can anyone help please 

I'm trying to run cronjob and execute function update() in guests_controller.php to remove outdated raws from guests table with field "ending". 

I run it in ssh to test on server e.g. /usr/bin/php -f /home/path_to/my_domain.com/html/app/controllers/guests_controller/update 

so is the /usr/bin/php -f /home/path_to/my_domain.com/html/app/controllers/guests_controller.php/update 

but it gives me an error .../html/app/controllers/guests_controller/update  AND/OR .../html/app/controllers/guests_controller.php/update Could not be found

and here is my function in guests_controller.php: 

   function update()

    {

$this->layout = null;

Configure::write('debug', 0);

      $today_date = date('Y-m-d H:i:s');

$guests = $this->Guest->find('all');

foreach ($guests as $guest)

{

if($guest['Guest']['ending'] <= $today_date)

{

$this->Guest->delete($guest['Guest']['id']);

}

}

    }

thanks in advance 

chris 

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