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As stated in the question, I need to block all traffic out to internet except for one port on MAC OS X 10.8.x.

I just need the commands to run from a shell or edit any conf file?

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assuming that your external interface is en0 you can try the following command (allow https/443 port in this example) :

printf "block all\npass on en0 proto { tcp,udp } from any to any port 443\n"|sudo /sbin/pfctl -Ef -

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