screensvronlock=/tmp/screensvronlock

if [ -f $screensvronlock ];
then
        rm $screensvronlock
#	notify-send "Screen on." -i /usr/share/icons/gnome/48x48/devices/display.png
else
        touch $screensvronlock
        sleep .6
        while [ -f  $screensvronlock ]
        do
                xscreensaver-command -activate
                sleep 2
        done
fi