Using sed to match a pattern and deleting from the line to the end of the file

Question

I\'m trying to match a pattern from piped input and/or a file, and then remove from the matched lines to the end of the file, inclusive. I\'ve looked everywhere, but can\'t

Answer 1

Dirty utility knife grep version:

cat your_output.txt | grep -B 99999999 "THIS STUFF IS USELESS" | grep -v "THIS STUFF IS USELESS"