start-stop-daemon在命令行工作，但在/etc/init.d脚本中不起作用

#! /bin/sh

echo "in /etc/init.d/ar_sendmail"
DIR=/home/max/work/e_learning_resource/trunk
PATH=/var/lib/gems/1.8/bin
DAEMON=/var/lib/gems/1.8/bin/ar_sendmail
DAEMON_OPTS="-e production -d --batch-size 100 --delay 150"
NAME=ar_sendmail
DESC=ar_sendmail
PID_FILE=/home/max/work/e_learning_resource/trunk/shared/log/ar_sendmail.pid


test -x $DAEMON || exit 0
set -e

case "$1" in
  start)
        echo -n "Starting $DESC: "
        start-stop-daemon -d $DIR --start --quiet --pidfile $PID_FILE 
                --exec $DAEMON -- $DAEMON_OPTS
        echo "$NAME."
        ;;
  stop)
        echo -n "Stopping $DESC: "
        kill -TERM `cat $PID_FILE`        
    rm $PID_FILE
        echo "$NAME."
        ;;
  restart)
        echo -n "Restarting $DESC: "
        kill -TERM `cat $PID_FILE`        
    rm $PID_FILE
        sleep 1
        start-stop-daemon -d $DIR --start --quiet --pidfile 
                $PID_FILE --exec $DAEMON -- $DAEMON_OPTS
        echo "$NAME."
        ;;
      *)
            N=/etc/init.d/$NAME
            echo "Usage: $N {start|stop|restart|reload}" >&2
            exit 1   
            ;;
    esac

    exit 0

#! /bin/sh