#!/bin/sh
_WALLPAPER="/home/diz/wallpaper"
_PIDFILE="/tmp/${0}.pid"
[ -f "$_PIDFILE" ] && exit 1
trap "rm ${_PIDFILE} ; exit 2" 3 15
touch $_PIDFILE || exit 3
echo $$ > $_PIDFILE || exit 4
while : ;
do  [ -f "$_PIDFILE" ] || exit 5
    [ `cat ${_PIDFILE}` = $$ ] || exit 6
    fbsetbg -r $_WALLPAPER
    sleep 120
done
rm $_PIDFILE
exit 255