Flux as a daemon (had trouble getting the gui to work on debian wheezy)

flux.sh

#!/bin/sh
### BEGIN INIT INFO
# Provides:          xflux
# Required-Start:    $all
# Required-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Initialize flux on launch
# Description:       Flux helps you to avoid eye and disrupted sleep patterns strain by adjusting your display colors based on time of day.
### END INIT INFO

#
#Daemonized flux for my zip code
#

ZIP=02139
PID=$(pgrep "xflux"| head -n 1)

case "$1" in
  start|"")
    if [ -z "$PID" ]
    then
      xflux -z $ZIP
    else
      echo "flux is already running: $PID"
    fi
    ;;
  stop)
    if [ -z "$PID" ]
    then
      echo "flux is not running."
    else
      kill $PID
    fi
    ;;
  *)
    echo "Usage: xflux.sh [start|stop]"
    exit 3
    ;;
esac