get all images associated with an array of product sku's programatically in Magento [first one is base/main image]

list_all_gallery_images_magento_product_by_sku.php

<?php
require_once 'app/Mage.php';
Mage::app();
$skus = array("LIST OF SKUS HERE");

foreach($skus as $item) {

	$product = Mage::getModel('catalog/product')->loadByAttribute('sku', $item)->getId();
	
	$gallery_images = Mage::getModel('catalog/product')->load($product)->getMediaGalleryImages();

	foreach($gallery_images as $g_image) {
		echo $g_image['url'] . ';';
	}
	echo "<br>";
}

?>

list_main_image_magento.php

<?php
ini_set('display_errors','on');
require_once 'app/Mage.php';
Mage::app();
$skus = array(LIST_OF_SKUS_HERE);

foreach($skus as $item) {
	$product_id = Mage::getModel('catalog/product')->loadByAttribute('sku', $item)->getId();
	$product = Mage::getModel('catalog/product')->load($product_id);
	$baseImageUrl = Mage::getModel('catalog/product_media_config')->getMediaUrl($product->getImage());
	echo "wget --directory-prefix=\"" . $item . "\" " . $baseImageUrl . "<br>";
}
?>