- Command Specification

  # socat will redirect input from both side to the opposite side
  socat [options] <addr1> <addr2>

- Connect Standard Input and Output

  socat - - 

- Connection Detection

  # server: listen on 8080
  socat - TCP-LISTEN:8080

  # client: connect to server
  socat - TCP:localhost:8080

- Keep Serving

  # server: use fork to keep serving when after a client quits
  socat - TCP-LISTEN:8080,fork,reuseaddr
  socat - TCP:localhost:8080 

- Port Forwarding

  socat TCP-LISTEN:8080,fork,reuseaddr  TCP:192.168.1.3:80

- Remote Login

  # basic remote login
  socat TCP-LISTEN:8080,fork,reuseaddr  EXEC:/usr/bin/bash
  socat - TCP:localhost:8080

  # remote login with a tty like terminal
  socat TCP-LISTEN:8080,fork,reuseaddr  EXEC:/usr/bin/bash,pty,stderr
  socat file:`tty`,raw,echo=0 TCP:localhost:8080

- Telnetd Simulation

  socat TCP-LISTEN:23,reuseaddr,fork,crlf exec:/bin/login,pty,setsid,setpgid,stderr,ctty

- Server Scripting

  socat TCP-LISTEN:8080,fork,reuseaddr SYSTEM:"bash web.sh"

- Echo Server

  socat TCP4-LISTEN:8000,fork,reuseaddr EXEC:/bin/cat
  socat -T180 UDP4-LISTEN:8000,fork,reuseaddr EXEC:/bin/cat

- File Receiving

  socat -u TCP-LISTEN:8080 open:record.log,create
  socat -u open:record.log TCP:localhost:8080

- Proxy Redirect

  socat TCP-LISTEN:<local-port>,reuseaddr,fork SOCKS:<socks-ip>:<remote-ip>:<remote-port>,socksport=<socks-port>
  socat TCP-LISTEN:<local-port>,reuseaddr,fork PROXY:<proxy-ip>:<remote-ip>:<remote-port>,proxyport=<proxy-port>