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socat

Multipurpose relay (SOcket CAT). More information: http://www.dest-unreach.org/socat/.

Listen to a port, wait for an incoming connection and transfer data to STDIO:

socat - TCP-LISTEN:8080,fork

Create a connection to a host and port, transfer data in STDIO to connected host:

socat - TCP4:www.example.com:80

Forward incoming data of a local port to another host and port:

socat TCP-LISTEN:80,fork TCP4:www.example.com:80