I was working on a e-commerce site for a large furniture manufacturer. They wanted to add a new attribute to a site that dealt with the fabrics they used. This would have been somewhere near 500 individual products with their own value for this attribute. We had to get this lined up on the product csv because somebody didn’t think to do it in the erp. One of my managers was set to go in and use Excel to merge the lists, but I realized he would have to do this every month until the end of time. I wrote a quick script on the site to do this anytime the product csv needed to be updated. Write once, run forever.