Créer votre fichier:

$ touch vnc_over_ssh.sh
$ chmod 766 vnc_over_ssh.sh

Copier le script suivant dans le fichier vnc_over_ssh.sh

#!/bin/bash
echo " "
echo "*** vnc_over_ssh.sh script Must be run on LOCAL machine ***"
echo " "
echo "Enter Username's password, then VNC Server password..."
echo " "

DEST_HOST=www.votre-site.com	# IP of SSH/VNC Server 
DEST_USER=votre_user		     # Username 
DEST_DISP=0				  # Xvnc Desktop Number

xhost + ${DEST_HOST}
pgrep  -f  "ssh -C -L 15000:localhost:590${DEST_DISP} ${DEST_USER} ${DEST_HOST} -f /bin/sleep 10 " > /dev/null
if [ $? != 0 ]; then
        ssh -C -L 15000:localhost:590${DEST_DISP} ${DEST_USER}@${DEST_HOST} -f /bin/sleep 10

        echo  ssh -C -L 15000:localhost:590${DEST_DISP} ${DEST_USER}@${DEST_HOST} -f /bin/sleep 10
fi

vncviewer localhost:15000 -LowColourLevel 2 -AutoSelect=0
xhost - ${DEST_HOST}

Pour l'exécuter taper:

$./vnc_over_ssh.sh