Magento update skus + add barcodes

update_skus.php

<?php
require_once 'abstract.php';

class Mage_Shell_Updateskus extends Mage_Shell_Abstract
{
    /**
     * Run script
     *
     */
    public function run()
    {
        if (isset($this->_args['import'])) {
            echo "Importing skus...";
            echo "done\n";

            // Need to use admin store to support disabled products
            Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);

            $file = Mage::getBaseDir('var') . DS . "importexport" . DS . "updateskus.csv";
            $handle = fopen($file, 'r');
            if($handle) {
                $record = array();
                while($record = fgetcsv($handle, 1000, ",")) {
                    $old_sku = $record[0];
                    $barcode = $record[1];
                    $new_sku = $record[2];
                    echo "Updating ".$old_sku."...";
                    try {
                        $get_item = Mage::getModel('catalog/product')->loadByAttribute('sku', $old_sku);
                        if ($get_item) {
                            $get_item->setOldsku($old_sku);
                            $get_item->setSku($new_sku);
                            $get_item->setBarcode($barcode);
                            $get_item->save();
                            echo "done\n";
                        } else {
                            echo "not found\n";
                        }
                    } catch (Exception $e) {
                        echo "Cannot retrieve products from Magento: " . $e->getMessage()."\n";
                        return;
                    }
                }
                fclose($handle);
            } else {
                echo "Cannot open " . $file ."\n";
            }
        } else {
            echo $this->usageHelp();
        }
    }

    /**
     * Retrieve Usage Help Message
     *
     */
    public function usageHelp()
    {
        return <<<USAGE
Usage:  php -f updateskus.php

  import        Import updated skus
  help          This help

USAGE;
    }
}

$shell = new Mage_Shell_Updateskus();
$shell->run();