netcat
listen
nc -lvp $port
connect
nc $host $port -v
connect with proxy
nc -X connect -x $proxy_host:$proxy_port $host $port -v
forward a local port to another local port
mkfifo /tmp/f;
nc -lpv $to < /tmp/f | nc localhost $from > /tmp/f
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nc -lvp $port
nc $host $port -v
nc -X connect -x $proxy_host:$proxy_port $host $port -v
mkfifo /tmp/f;
nc -lpv $to < /tmp/f | nc localhost $from > /tmp/f