Mass update magento products sku

This tutorial explains how to mass update magento products sku. The following code updates the sku based on the old magento products sku.

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function rewriteSku($newDatas) {
    $i = 1;
    foreach($newDatas as $newData) {
        $product = Mage::getModel('catalog/product')->loadByAttribute('sku', $newData[1]);
        if($product) { 
            echo  $i++.' '.$product->getName() . ' SKU updated';
            echo "\n";

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