This example will open a listening tcp4 socket on 127.0.0.1:2222 and the continuously check for a file in the current working directory called conf
The file should contain only one line with the $IP:$PORT to proxy connections to.
For example if you write in it localhost:22
echo -n "localhost:22" > conf
and then
ssh -p 2222 localhost
you will be connected (if ssh is running on localhost) to the ssh server listening on localhost:22
if you then delete the conf or update the address the proxy will disconnect you and future connections will redirect to the new address (or instantly close the connection if the conf file is empty/wrong).