#!/bin/sh

# no message if one is displayed already
if [[ "`ps -efww | grep -v grep | grep gxmessage`" == "" ]]; then
    # no message if screensaver active
    if [ "`ps -efww | grep -v grep | grep xscreensaver`" == "" ]; then
        export DISPLAY=:0
        gxmessage 'Rest your eyes!'
    fi
fi