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Ah, the eternal gang war of the command line. On the red side, we have the cat /file | grep pattern crew—unnecessarily piping a file into grep like they're getting paid by the character. On the blue side, the enlightened grep pattern /file purists who skip the middleman.
It's basically the command-line equivalent of taking a taxi to walk across the street. Sure, both get the job done, but one makes efficiency nerds twitch uncontrollably. The real gangsters use grep -r pattern . and don't even specify files. Absolute chaos.
