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I'd like to temporarily turn on the echo service (TCP and UDP port 7) on in Mac OS 10.6 (Snow Leopard). I guess this involves using the launchctl/launchd?

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Port number 7 is traditionally labeled "echo", but AFAIK no modern OS implements it.

Note that this is completely different from the ICMP_ECHO used by ping. That is enabled by default, although it will be blocked if the firewall is placed in stealth mode.

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