SSH port forwarding script to access servers beyond firewalls, but accessible via "jump" servers. Run this script on the "jump" server

port_forward.sh

#!/bin/sh
#RUN this script to establish connection SSH Forwarding to HOSTNAME_HERE"
port=`netstat -an | grep 65321 | grep LISTEN |  tr -s " " | cut -d" " -f 4 | cut -d"." -f 2`
if [[ $port -ne 65321 ]]
then
         echo "Please Enter JUMP_SERVER Password:"
        `ssh -gL 65321:HOSTNAME_HERE:22 0`
else
        echo "HOSTNAME_HERE Redirect is already running on port 65321"
fi