Catalog Product update Magento 1.x – CSV

If you want to update attribute value for Magento catalog product in bulk, you can use CSV. Just create a CSV file with column SKU and respective attribute values for a product.

Using the above PHP script you can update multiple attribute value programmatically. You can set CRON to run this script automatically.

The above script capable to upload above 1 lakh products attributes value via CRON and CSV read from bottom to up that help when you have a very large file.