liunx 程序监控是否正常

#!/bin/sh
while true
do
MYDATE=$(date +"%Y-%m-%d %H:%M:%S")
echo "$MYDATE" >> checkhzzm.log
ps -ef | grep "hzzm.jar"| grep -v "grep" >>checkhzzm.log
if [ "$?" -eq 1 ]     #上一条命令返回值0成功，1失败
then
    cd hzzm
    ./start.sh    #要运行的应用程序、脚本等
    echo "process has been restarted!" >>checkhzzm.log
else
    echo "process already started!" >>checkhzzm.log
fi
  sleep 30
 done

　上面是示例，百度抄来的

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#check.sh &                    #永真程序，&后台执行 

#!/bin/sh

while true; do
    MYDATE=$(date +"%Y-%m-%d %H:%M:%S")
    echo "$MYDATE" >> /usr/local/data-integration/kettle_all/logs/kettle.log
    ps -ef | grep "./pan.sh" | grep -v "grep" >> /usr/local/data-integration/kettle_all/logs/kettle.log
        if [ "$?" -eq 1 ]; then
            cd /usr/local/data-integration/ 
            && ./pan.sh -file=./kettle_all/WINDTOYX/DataIncrement/YX_KFK_CONSUMER.ktr -level=Debug -logfile=./logs/YX_KFK_CONSUMER_`date +%F`.log
            echo "process has been restarted!" >> /usr/local/data-integration/kettle_all/logs/kettle.log
        else
            echo "process already started!" >> /usr/local/data-integration/kettle_all/logs/kettle.log
        fi
sleep 30
done

ps:
"$?" -eq 1 #上一条命令返回值0成功，1失败
连接符
&& 当上面命令执行成功后，再执行后面的
sleep 30 休眠30秒