Errors should exit with non zero exit code about rack HOT 7 CLOSED

Hmm. What would be the expected behavior? It's true that we should return a non-zero exit code on error, but I think in your case it would run grep either way (since you'd be getting back an error message).

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I incorrectly assumed that non-zero exit would fail to execute after the pipe.

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For that, we'd have to exit before anything was printed. We could do that, but the user wouldn't get back an error message.

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Lets just make sure we return non-zero for error cases and leave it at that.

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What makes us have to exit before printing? All manner of tools will print on stderr and exit with a return code.

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For that, we'd have to exit before anything was printed.

*printed to stdout

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Nevermind me, it looks like you handled it right in #77 + #76

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