Set status COMPLETE for single order via PHP script

Magento_status_complete_single

<?php
require_once 'app/Mage.php';
umask(0);
Mage::app();

$order_id = '200000832';
$order = Mage::getModel('sales/order')->loadByIncrementId($order_id);
        $order->setData('state', "complete");
        $order->setStatus("complete");       
        $history = $order->addStatusHistoryComment('Order status changed via script.', false);
        $history->setIsCustomerNotified(false);
        $order->save();
?>