Raspberry Pi LXDE Slideshow

slideshow.sh

#!/bin/bash

STICK_A="/media/pi/AF7C-CF1E";
STICK_B="/media/pi/IMAGES";
TEMPF="/home/pi/slideshow.tmp";
DELAY=5;

export DISPLAY=":0"

if [ -d "$STICK_A" ]; then
  FOLDER=$STICK_A;
fi
if [ -d "$STICK_B" ]; then
  FOLDER=$STICK_B;
fi

if [ -d "$FOLDER" ]; then
  MD5C=$(ls -al $FOLDER | md5sum | awk '{ print $1 }');
else
  echo "Error: Folder does not exist";
  exit 1;
fi;

case $1 in
start)
	feh --quiet --auto-zoom --fullscreen --hide-pointer --recursive --image-bg white --slideshow-delay $DELAY $FOLDER &
	echo $MD5C > $TEMPF
	;;

stop)
	pgrep -f "feh" > /dev/null && kill `pgrep -f "feh"` && rm $TEMPF
	;;

toggle)
	if [ -e "$TEMPF" ]; then
	  echo "Stopping Slideshow";
	  $0 stop
	else
	  echo "Starting Slideshow";
	  $0 start
	fi
	;;


restart)
	$0 stop && $0 start
	;;

status)
	if [ $(pgrep -f "feh") ]; then
	  echo "Slideshow running";
	  exit 0;
	else
	  echo "Slideshow not running";
	  exit $?
	fi
	;;

cron)
	if [ -e "$TEMPF" ]; then
	  MD5O=`cat $TEMPF`;
	  
	  # Check is feh is running
	  if [ $(pgrep -f "feh") ]; then
            echo "feh is still running"
	  else
	    echo "feh is not running; restart slideshow"
	    $0 start
	  fi

	  # Changes made = restart
          if [ "$MD5O" != "$MD5C" ]; then
            echo "Image folder changed; restart!"
            echo $MD5C > $TEMPF;
            $0 restart
            exit 0
          fi
	else
	  echo "Slide show not started or $TEMPF vanished"
	  exit 0
	fi
	;;

*)
	echo "Usage: $0 {start|stop|reload|cron}";
	exit 2
	;;

esac