帮我看看服务启动脚本的错误

在/usr/local/bin下面放好了可执行程序，参照了/etc/init.d/ypxfrd ，稍微改了一下，写成了下面这个脚本，运行这个脚本(取名为teststart),red hat 9.0下报错,说无这个文件或者目录/etc/rc.d/init.d/functions! 我去此目录下看了,存在该文件,并且我用shell 运行ypxfrd,可以正常执行. 可我只是修改了几处地方.下面是我改写的脚本,我第一次写这东西,想必还有其他错误.请高手指教
#!/bin/bash
#
# Elink DG: Starts the Elink DG
#
# Version: @(#) /etc/init.d/elinkdg 1.0


# Source function library.
[ -f /etc/rc.d/init.d/functions ] || exit 0
. /etc/rc.d/init.d/functions

# The application programe path.
# add sosdairs
[ -f /usr/local/bin/elinkdg] || exit 0

RETVAL=0

start() {
echo -n $"Starting Elink DG server: "
# modify by sosdairs
# here has a error? YPXFRD_ARGS?
daemon elinkdg $YPXFRD_ARGS
ETVAL=$?
echo
# modify by sosdairs
[ $RETVAL -eq 0 ] && touch /usr/local/bin/elinkdginfo
return $RETVAL
}

stop() {
echo -n $"Stopping Elink DG server: "
killproc elinkdg
RETVAL=$?
# modify by sosdairs
[ $RETVAL -eq 0 ] && rm -f /usr/local/bin/elinkdginfo
echo
return $RETVAL
}

# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
status)
status rpc.ypxfrd
;;
restart|reload)
stop
start
;;
condrestart)
if [ -f /usr/local/bin/elinkdginfo ]; then
stop
start
fi
;;
*)
echo $"Usage: $0 {start|stop|status|restart|reload|condrestart}"
exit 1
esac

exit $RETVAL