External script to check which shipping method is Active in magento.
Below is the code to display all shipping method.

create new file in root of the magento source and add below code in that file

require_once('app/Mage.php'); //Path to Magento
umask(0);
Mage::app();
$methods = Mage::getSingleton('shipping/config')->getActiveCarriers();
$shipMethods = array();
foreach ($methods as $shippigCode=>$shippingModel)
{
$shippingTitle = Mage::getStoreConfig('carriers/'.$shippigCode.'/title');
$shipMethods[$shippigCode] = $shippingTitle;
}
echo "<pre>";
print_r($shipMethods);