Updated version of - https://gist.github.com/kura/5065819 + https://gist.github.com/codeinthehole/5064150 Forwards a list of known ports from localhost to a host

portforward.sh

#!/bin/bash

if [[ $# -lt 2 ]]
then
  echo "Usage: port-forward HOST REMOTE_PORT [LOCAL_PORT]";
else
  HOST=$1
  REMOTE_PORT=$2
  LOCAL_PORT=${3:-${REMOTE_PORT}}

  if ! [[ $(lsof -i :$LOCAL_PORT | grep COMMAND) ]]
  then
    # Port is free, set up tunnel
    echo "Forwarding to port $REMOTE_PORT on $HOST from http://localhost:$LOCAL_PORT"
    ssh -f -L "$LOCAL_PORT:localhost:$REMOTE_PORT" "$HOST" -N 2> /dev/null
  else
    # Call script again with new local port
    "$0" "$HOST" "$REMOTE_PORT" $((RANDOM+1000))
  fi
fi