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What does the number 2 mean on this grep command line?

grep -2riP

I've seen this on the fu command line. I checked the man page but couldn't find it, it's possible that I may have missed it.

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From the grep man page:

-C NUM, -NUM , --context = NUM ​​Prints NUM lines of output. Places a line containing a group separator (described in the -group separator section) between adjacent groups of matches. With -o or --only-matching, this has no effect and a warning is issued.



so it's grep -2

equivalent grep -C 2

in which grep displays 2 lines before and after the match.

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