用于删除文本文件中特定行的批处理脚本

I'm trying to automate some process for a new software we use at work. I have a .zip file that gets downloaded automatically from an FTP every 4 hours. The .zip file is then uncompressed and the .txt file in it is renamed to a .csv using 2 .bat files that I managed to scrap together with my very little knowledge and the resulting .csv is imported in the software. This part works correctly.I'm trying to automate some process for a new s