shell 服務狀態監控

　　#!/bin/sh

　　DBSTAT=`ps -ef|grep 'postmaster'|grep -v 'grep'`

　　if [ "$DBSTAT" == "" ];

　　then

　　echo "DB down"

　　DBstus=`ps -ef|grep 'postmaster'|grep -v 'grep'`

　　while [ "$DBstus" == "" ];

　　do

　　if ["$DBstus" == ""];

　　then

　　echo "DB starting ..."

　　/etc/init.d/postgresql start

　　DBstus=`ps -ef|grep 'postmaster'|grep -v 'grep'`

　　else

　　echo "PostgreSQL already running! "

　　fi

　　done

　　else

　　echo "DB running"

　　fi