| 
<?php
 include_once './app/Mage.php';
 Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);
 
 $ordersIds = array(
 '1',
 '2',
 );
 
 foreach ($ordersIds as $orderId) {
 $order = Mage::getModel('sales/order')->loadByIncrementId($orderId);
 
 // status slug and comment
 $order->addStatusToHistory('complete_shipped', 'Status comment');
 $order->save();
 }
 
 |