#!/bin/bash

echo $(feh -F image1.jpg)
PID=`ps -eaf | grep feh | grep -v grep | awk '{print $2}'`
if [[ "" !=  "$PID" ]]; then
  echo "killing $PID"
  kill -9 $PID
fi

feh -F image1.jpg &
PID = "$!"
kill -9 $PID