product-to-new-website.php

<?php
/**
 *
 * Copyright (c) 2017.
 * product-to-new-website.php
 * Code compiled by: @dbashyal 'damu' on 18/09/17 2:01 PM
 * Visit http://dltr.org for Magento Tips and Tricks
 *
 */

require_once '../abstract.php';
class Mage_Shell_Lowes_ProductToNewWebsite extends Mage_Shell_Abstract
{
    public function run()
    {
        $websiteIds = array(1,3,4);
        $productIds= Mage::getResourceModel('catalog/product_collection')->getAllIds();
        Mage::getModel('catalog/product_website')->addProducts($websiteIds, $productIds);
    }
}

$shell = new Mage_Shell_Lowes_ProductToNewWebsite();

try{
    // fetch new data
    $shell->run();
} catch (Exception $e){
    echo $e->__toString();
}

echo "done!\n";