More clear info for any of you running this on a Raspberry Pi, here is what I added to my /etc/rc.local script to automatically startup two instances of the tcptunnel which I want to stay running forever in the background:
cd /home/pi/tcptunnel
./tcptunnel --local-port=5577 --remote-port=5577 --remote-host=10.10.10.62 --log --fork&
./tcptunnel --local-port=5578 --remote-port=5577 --remote-host=10.10.10.63 --log --fork&
If you need to see the logging output once you get it all working, you can issue the command:
sudo cat /dev/vcs1
Here is a screenshot to hopefully help you visualize what I am saying
