Shell脚本如下：

#/bin/bash
#environment variable
source /etc/profile
#memory
bu=`free | awk 'NR==2{print $6}'`
ca=`free | awk 'NR==2{print $7}'`
us=`free | awk 'NR==2{print $3}'`
to=`free | awk 'NR==2{print $2}'`
mem=`expr "scale=2;($us-$bu-$ca)/$to" |bc -l | cut -d. -f2`
if(($mem >= 70))
        then
        msg="TIME:$(date +%F_%T)
                 HOSTNAME:$(hostname)
                 IPADDR:$(ifconfig |awk 'NR==2{print $2}')
                 MSG:内存high了high了！已经用了${mem}%"
            echo $msg
        /test/pymail.py $msg
fi

@H_301_14@转载请注明出处：http://blog.csdn.net/xiezuoyong/article/details/74011009