Batch Set Customer Default Billing Address as Shipping Address

	public function run(){
		//search all customer.
		$collection = Mage::getModel("customer/customer")->getCollection()->addAttributeToSelect("*");
		//->addFieldToFilter("email",'bobo.wang@bysoftchina.com');
		foreach ($collection as $customer) {
			if ($customer->getDefaultShippingAddress()) {
				$addressId = $customer->getDefaultShippingAddress()->getId();
				$address  = Mage::getModel('customer/address')->load($addressId);
				$address->setCustomerId($customer->getId())
				->setIsDefaultBilling('1');
				$address->save();
				var_dump('customer:'. $customer->getEmail());
				var_dump($address->getData());
				var_dump('save default billing id:'.$addressId.' successed!');
			} else {
				var_dump('customer:'. $customer->getEmail() . ' has no default shipping address');
			}
		}
	}