Use shell+sendmail to implement server monitoring and alarm script

#!/bin/bash
checkmail() {
    /usr/bin/perl ./sendEmail -f userid@ -t oneuserid@ –cc twouserid@ threeuserid@
-u "$subject" -m "$data" -s -xu userid -xp password
    sleep 300
}
while true;do
    loadavg=`awk '{print $2}' /proc/loadavg`
    diskuse=`df |awk '/cache/{print $5}'`
    servrun=`netstat -pln|awk -F/ '/:80/{print $NF}'`

    ip=`ifconfig|awk '/cast/{print $2}'|awk -F: '{if(NR==1){a=$2}else if(NR==2){b=$2}}END{print b"-"a}'`
    data=`echo -e "ip:$ip\nloadavg/5min:$loadavg\tcacheuse%:$diskuse\tservice:$servrun"`
    diskper=`echo $diskuse|sed 's/%//'`

    num=`ps aux|grep |grep -v grep|wc -l`

    if [[ $num > 2 ]];then
        break 2
    fi

    if [[ $loadavg > 1.00 ]] && [[ $diskper > 90 ]];then
        subject="warning-$ip-loadavg-disk"
        checkmail
    else if [[ $loadavg > 1.00 ]];then
        subject="warning-$ip-loadavg"
        checkmail
    else if [[ $diskper > 90 ]];then
        subject="warning-$ip-disk"
        checkmail
    fi
    sleep 60
done
EOF