A very useful unix init.d script template

init.d.script

#!/bin/bash
### BEGIN INIT INFO
# Provides:          SERVICE NAME
# Required-Start:    $remote_fs
# Should-Start:
# Required-Stop:     $remote_fs
# Should-Stop:
# Default-Start:     3 4 5
# Default-Stop:      0 1 2 6
# Short-APP_DESCRIPTION: SERVICE DESCRIPTION
### END INIT INFO

. /lib/lsb/init-functions

# modify start
APP_NAME=SERVICE NAME
APP_DESCRIPTION="SERVICE DESCRIPTION"
APP_CMD="SERVICE START COMMAND"
APP_USER=root
APP_PID_FILE=SERVICE PID FILE
APP_LOG_FILE=SERVICE LOG FILE

# modify end

APP_LOCK_DIR="/var/lock/subsys/"
LOCKFILE="${APP_LOCK_DIR}/${APP_NAME}"

STATUS_RUNNING=0
STATUS_DEAD=1
STATUS_DEAD_AND_LOCK=2
STATUS_NOT_RUNNING=3
ERROR_PROGRAM_NOT_INSTALLED=5

# These directories may be tmpfs and may or may not exist
# depending on the OS (ex: /var/lock/subsys does not exist on debian/ubuntu)
for dir in "$APP_LOCK_DIR"; do
  [ -d "${dir}" ] || install -d -m 0755 -o $APP_USER -g $APP_USER ${dir}
done

APP_SHUTDOWN_TIMEOUT=${APP_SHUTDOWN_TIMEOUT:-60}

start() {
  [ -x $exec ] || exit $ERROR_PROGRAM_NOT_INSTALLED

  checkstatus
  status=$?
  if [ "$status" -eq "$STATUS_RUNNING" ]; then
    exit 0
  fi

  log_success_msg "Starting ${APP_DESCRIPTION} (${APP_NAME}): "
  /bin/su -s /bin/bash -c "/bin/bash -c 'echo \$\$ > ${APP_PID_FILE} && exec ${APP_CMD} >>${APP_LOG_FILE} 2>&1 ' &" $APP_USER
  RETVAL=$?
  [ $RETVAL -eq 0 ] && touch $LOCKFILE
  return $RETVAL
}

stop() {
  if [ ! -e $APP_PID_FILE ]; then
    log_failure_msg "${APP_NAME} is not running"
    exit 0
  fi

  log_success_msg "Stopping ${APP_DESCRIPTION} (${APP_NAME}): "

  APP_PID=`cat $APP_PID_FILE`
  if [ -n $APP_PID ]; then
    kill -TERM ${APP_PID} &>/dev/null
    for i in `seq 1 ${APP_SHUTDOWN_TIMEOUT}` ; do
      kill -0 ${APP_PID} &>/dev/null || break
      sleep 1
    done
    kill -KILL ${APP_PID} &>/dev/null
  fi
  rm -f $LOCKFILE $APP_PID_FILE
  return 0
}

restart() {
  stop
  start
}

checkstatus(){
  pidofproc -p $APP_PID_FILE java > /dev/null
  status=$?

  case "$status" in
    $STATUS_RUNNING)
      log_success_msg "${APP_NAME} is running"
      ;;
    $STATUS_DEAD)
      log_failure_msg "${APP_NAME} is dead and pid file exists"
      ;;
    $STATUS_DEAD_AND_LOCK)
      log_failure_msg "${APP_NAME} is dead and lock file exists"
      ;;
    $STATUS_NOT_RUNNING)
      log_failure_msg "${APP_NAME} is not running"
      ;;
    *)
      log_failure_msg "${APP_NAME} status is unknown"
      ;;
  esac
  return $status
}

condrestart(){
  [ -e ${LOCKFILE} ] && restart || :
}

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  status)
    checkstatus
    ;;
  restart)
    restart
    ;;
  condrestart|try-restart)
    condrestart
    ;;
  *)
    echo $"Usage: $0 {start|stop|status|restart|try-restart|condrestart}"
    exit 1
esac

exit $RETVAL