port forward 80 Mac & npm/node/nvm install

https://github.com/creationix/nvm/blob/master/README.md

echo "rdr pass inet proto tcp from any to any port 80 -> 127.0.0.1 port 8080" | sudo pfctl -ef -


echo -e "rdr pass inet proto tcp from any to any port 443 -> 127.0.0.1 port 4343\nrdr pass inet proto tcp from any to any port 80 -> 127.0.0.1 port 8080" | sudo pfctl -ef -