Remove Duplicate Lines From a 48,000-Line CSV Without Losing the Original Order Last month I had to merge two exports from our billing system into one import file. The first export had 31,207 customer email addresses, the second had 17,706, and a few thousand lines overlapped. The CRM import en...
Source: [Dev.to](https://dev.to/meng_meng_56f17e28e55f140/remove-duplicate-lines-from-a-48000-line-csv-without-losing-the-original-order-4npe)