linux shell守护进程/ rac重启脚本

建立一个守护进程：

#! /bin/sh
PRO_NAME=./xxxx.sh 

while true ; do
     #用ps获取$PRO_NAME进程数量
     echo ‘‘> nohup.out
     NUM=`ps aux | grep -w ${PRO_NAME} | grep -v grep |wc -l`
     #echo $NUM
     #少于1，重启进程
     if [ "${NUM}" -lt "1" ];then
         echo "${PRO_NAME} was killed"
         ${PRO_NAME} -d
    #大于1，杀掉所有进程，重启
    elif [ "${NUM}" -gt "1" ];then
        echo "more than 1 ${PRO_NAME},killall ${PRO_NAME}"
         killall -9 $PRO_NAME
        ${PRO_NAME} -d
     fi
     #kill僵尸进程
     NUM_STAT=`ps aux | grep -w ${PRO_NAME} | grep T | grep -v grep | wc -l`
     if [ "${NUM_STAT}" -gt "0" ];then
         killall -9 ${PRO_NAME}
         ${PRO_NAME} -d
    fi
     sleep 5s
 done  

 exit 0

建立一个重启DB的脚本（仅限rac使用),纯粹为方便：

#!/bin/bash
if [ $1 ]
then
{
db_name=$1
srvctl stop database -d $db_name -o abort
num=`ps -ef|grep -i smon_|grep -v grep|grep -v -i asm|awk ‘{print $2}‘ `
if [ ! $num ]
then
echo "database restart........."
fi
while [ "$num" ]
do
sleep 1
num=`ps -ef|grep -i smon_|grep -v grep|grep -v -i asm |awk ‘{ print $2  }‘`
echo "database not shutdown ,please check!"
done
srvctl start database -d $1

num=`ps -ef|grep -i smon_|grep -v grep|grep -v -i asm |awk ‘{ print $2 } ‘`
if [ $num ]
then
echo "database starting "
fi
if [ ! -n "$num" ]
then
echo "start fail"
else
echo  "start sucessfully"
fi
}
else
echo "No parameter ,eg: ./stop_db.sh dbname"
fi

原文地址：http://blog.51cto.com/snowhill/2086230