init script for jdownloader

jdownloader.sh

#!/bin/sh
### BEGIN INIT INFO
# Provides:          jdownloader
# Required-Start:    $networking
# Required-Stop:     
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: JDownloader
### END INIT INFO

PROG_NICK="JDownloader"
PROG_NAME="JDownloader.jar"
PROG_HOME="/opt/jdownloader"
PROG_USER="jdownloader"
PROG_RUN="java -jar ${PROG_HOME}/${PROG_NAME}"

is_running() {
  pgrep -f "${PROG_NAME}" >/dev/null
  [ $? -gt 0 ] && return 1 || return 0
}

do_start() {
  if is_running; then
    echo "${PROG_NICK} is already running."
  else
    echo -n "Start ${PROG_NICK}: "
    su -l ${PROG_USER} -c "${PROG_RUN} &" >/dev/null 2>&1
    echo "done"
  fi
}

do_stop() {
  if ! is_running; then
    echo "${PROG_NICK} is not running."
  else
    echo -n "Stop ${PROG_NICK}: "
    for i in $(pgrep -f "${PROG_NAME}"); do
      kill ${i} >/dev/null 2>&1
      if ps -p ${i} >/dev/null; then sleep 1; kill -9 ${i} >/dev/null 2>&1; fi
    done
    echo "done"
  fi
}

do_status() {
  if is_running; then
    echo "${PROG_NICK} is running."
  else
    echo "${PROG_NICK} is stopped."
  fi
}

case "$1" in
  start)
    do_start
    ;;
  stop)
    do_stop
    ;;
  restart)
    do_stop
    do_start
  ;;
  status)
    do_status
    ;;
  *)
    echo "Usage: ${0} {start|stop|restart|status}"
    exit 3
    ;;
esac