Setup SSH tunnel on OSX

gistfile1.sh

#!/bin/bash

# setup local
BIND_ADAPTER="en0"
LOCAL_PORT=4000

# setup remote
REMOTE_USER="user"
REMOTE_HOST="server.example.com"
REMOTE_PORT=9999

echo "Make sure $REMOTE_PORT is open on $REMOTE_HOST and 'GatewayPorts yes' is set in sshd.conf"

LOCAL=$(ifconfig $BIND_ADAPTER | grep 'inet ' | cut -d " " -f2 | awk '{print $1}')
echo "$REMOTE_HOST:$REMOTE_PORT -> $LOCAL:$LOCAL_PORT"
ssh $REMOTE_USER@$REMOTE_HOST -N -R $REMOTE_PORT:$LOCAL:$LOCAL_PORT