I refuse to repeat the documentation until you have at least
tried to read it. That is why it is there and it is
faster for both of us if you take advantage of it.
As for your additional question, the -n option is an
implicit loop over the lines in both
files. If you want to do words, then within each line you
would need to loop over the words as well. But the same
logic would work. (OTOH the algorithm will get rather
inefficient. But oh well.)
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