Simple c++ question please help

I have a bat file that writes data to a txt file and i am trying to recover this data using a bat file once again. I can get the first line of a txt file but getting others i can not do so i was wondering. Is there a way to remove a line from a txt file. A example of what i want to happen is this. 3 4 5 6 becomes 4 5 6 and not 4 5 6 If you can find out how to do this thank you very much.

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