一台监控主机，一台被监控主机。被监控主机分区使用率大于80%，就发告警邮件。放到crontab里面，每10分钟执行一次

#/bin/bash

FSMAX="80"
remote_user='root'
remote_ip=(IP地址列表)
ip_num='0'

while [ "$ip_num" -le "$(expr ${#remote_ip[@]} -l)"]
do
read_num='1'
        ssh "$remote_user"@"${remote_ip[$ip_num]}" df -h > /tmp/diskcheck_tmp
        grep '^/dev/*' /tmp/diskcheck_tmp | awk '{print $5}'|sed 's/\\%//g' > /tmp/diskcheck_num_tmp

        while [ "$read_num" -le $(wc -l < /tmp/diskcheck_num_tmp) ]
        do
                size=$(sed -n "$read_num" 'p' /tmp/diskcheck_num_tmp)
                if [ "size" -gt "$FSMAX" ]
                then
                        $(grep '^/dev/*' /tmp/diskcheck_tmp |sed -n $read_num'p' > /tmp/disk_check_mail)
                        $(echo ${remote_ip[$ip_num]}) >> /tmp/disk_check_mail)
                        $(mail -s "diskcheck_alert" admin < /tmp/disk_check_mail)
                fi

                read_num=$(expr $read_num + 1)
        done
        ip_num=$(expr $ip_num + 1)
done