shell 守护java进程

#这个程序功能很实用，目的是监控我的三个java jar包，三十秒查询一次，
#哪个程序跪了，就重启哪个程序
#!/bin/bash
while true  
do
   down=` ps -aux |grep -w down.jar |grep -v grep|wc -l`
   readdown=` ps -aux |grep -w readdown.jar |grep -v grep|wc -l`
   downzpToFnish=` ps -aux |grep -w downzpToFnish.jar |grep -v grep|wc -l`

   if [ $down -eq 0 ];
       then
          nohup java -jar /root/down.jar /mnt/mydisk/down/ > /root/down.log 2>&1 &
       else
          echo "down.jar Alive"
   fi

   if [ $readdown -eq 0 ];
       then
          nohup java -jar /root/readdown.jar > /root/readdown.log 2>&1 &
       else
          echo "readdown.jar still alive"
   fi

   if [ $downzpToFnish -eq 0 ];
       then
          nohup java -jar /root/downzpToFnish.jar /mnt/mydisk/zpdown/ > /root/zp.log 2>&1 &
       else
          echo "downzpToFnish.jar still alive"
   fi


   sleep 30
done
~