#!/usr/bin/env bash
USER=$(whoami)

# get new display 
DISPLAY=0
for file in /var/lib/vnc/* ; do
    if [ $(cat $file) -gt $DISPLAY ] ; then
        DISPLAY=$(cat $file)
    fi
done
let "DISPLAY++"

# add user file
echo "$DISPLAY" > /var/lib/vnc/${USER}
chmod 644 /var/lib/vnc/${USER}

/usr/local/bin/startvnc

PORT=$((DISPLAY + 5900))

echo
echo "Your port number is ${PORT}; please note it down."
echo "You might like to see https://wiki.thunix.net/wiki/vnc for further information."