Check and alert if mysql slave is not running

#!/bin/bash
# check if mysql slave is running

log=/var/log/mysqlslave.log
email=user@example.com

date >> $log
res=`mysql -u root -pPassword -h db.example.com -N -B -e "show status like 'Slave_running'"|cut -f2`

if [ $res = 'ON' ]
then
  echo 'running' >> $log
else
  echo 'NOT RUNNING' >> $log
  echo "Mysql slave not running" |mail -s "Slave not running" $email
fi