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man sshshows how:ssh -f -L 1234:localhost:6667 server.example.com sleep 10 && irc -c '#users' -p 1234 pinky 127.0.0.1The -f option backgrounds ssh and the remote command ``sleep 10'' is specified to allow an amount of time (10 seconds, in the example) to start the service which is to be tunnelled. If no connections are made within the time specified, ssh will exit. ```