#!/bin/bash #define mysql variable mysql_user="root" mysql_pass="123456" email_addr="slave@jb51.net" mysql_status=`netstat -nl | awk 'NR>2{if ($4 ~ /.*:3306/) {print "Yes";exit 0}}'` if [ "$mysql_status" == "Yes" ];then         slave_status=`mysql -u${mysql_user} -p${mysql_pass} -e"show slave status\G" | grep "Running" | awk '{if ($2 != "Yes") {print "No";exit 1}}'`         if [ "$slave_status" == "No" ];then                 echo "slave is not working!"                 [ ! -f "/tmp/slave" ] && echo "Slave is not working!" | mail -s "Warn!MySQL Slave is not working" ${email_addr}                 touch /tmp/slave         else                 echo "slave is working."                 [ -f "/tmp/slave" ] && rm -f /tmp/slave         fi         [ -f "/tmp/mysql_down" ] && rm -f /tmp/mysql_down else         [ ! -f "/tmp/mysql_down" ] && echo "Mysql Server is down!" | mail -s "Warn!MySQL server is down!" ${email_addr}         touch /tmp/mysql_down fi