if you can't be bothered to learn something or read the
   manual, what the hell are you doing using UNIX?

maybe someone wants a real operating system, knows unix, but, wants
some very commonly used idioms easily used.  typing:

% find /local/src /usr/src <etc> -type f -print0 | xargs -0 grep -ni <pattern>

is really annoying.  a smart shell script that would pass the find
args to find and the rest to grep would be, imo, better than the
C version -- without bloating grep.