display slideshow on raspberry pi

pi-run.sh

#! /usr/bin/env bash

COUNT=$(ls -1 data/ | wc -l)
NUM=$(python -c 'import time; print (int(time.time())/600%'${COUNT}'+1)')
NUM2=$(expr $(date "+%s") / 600 % \( $COUNT + 1 \) )

echo -n "Run what=$NUM when=$(date) pi=$NUM vs sh=$NUM2 $NUM:$NUM2"

HOME=${HOME-:/home/pi}
DELAY=8

if pgrep fehplus ; then

  # create link to correct album
  ln -s /home/pi/data/$NUM $HOME/show_temp
  # atomicly replace show link
  mv -Tf $HOME/show_temp $HOME/show
  # tell fehplus to rescan directory
  kill -SIGURG $(pgrep fehplus)

  sleep 1

  if pgrep fehplus ; then
    echo "Looks like fehplus is running: $(pgrep fehplus)"
    exit 0
  fi

  echo "fehplus needs to be restarted"
else
  echo "fehplus was no running and needs to be restarted"
fi

export DISPLAY=:0.0
/usr/local/bin/fehplus -FZpr --hide-pointer -D $DELAY $HOME/show &>$HOME/fehout.log </dev/null &
PID=$!
#echo $PID >$HOME/feh.pid
echo " pid=$PID"
sleep 1
echo " feh out:"
sed -e's/^/--->/' $HOME/fehout.log