shell脚本，如何监控mysql数据库。

[root@localhost wyb]# cat jkmysql 
#!/bin/bash

status=`/etc/init.d/mysqld status|grep running|wc -l`
process=`ps -ef |grep mysqld|grep -v grep|wc -l`
port=`lsof -i:3306|grep -i listen|wc -l`


mysql -uroot -p‘test‘ -e "show databases;" >/dev/null 2>/dev/null

a=$?

[ $a -eq 0 ] && [ $port -ne 0 ] && [ $process -ne 0 ] && [ $status -ne 0 ] 
echo "mysql is running" || echo "mysql is not running"
[root@localhost wyb]# bash jkmysql 
mysql is running
[root@localhost wyb]#