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The grep command makes no sense. Your selecting an inverted match of nothing. Are you trying to find the number of lines that were not cut? Grep doesn't know what "-f1" in the cut command means. The dash after f in the grep command should not be there. I'm not sure what you're attempting to do, but omitting the grep command would give you the number of lines in the file.
Have you tried with a smaller sample set to see why your command is not working? Most commands do have some type of limitation, however, if you were to hit it then you would have an error message.
First simple test to see if it is a limit thing would be to make a copy of the 'found' file and add a single entry which should get returned.
I would add that this is often a case where you could use a single tool like awk instead of 2 commands which might have issues