实用的监控内存插件

#!/bin/bash

#####定义变量#############

mt=`free -m | grep M |awk '{print $2}'`

mf=`free -m | grep -|awk '{print $4}'`

sf=`free -m | grep S|awk '{print $4}'`

st=`free -m | grep S|awk '{print $2}'`

warn=$(($mf*100/$mt))

sw=$(($sf*100/$st))

if [$warn -lt 20];then

         echo "the empty space in memory is lower than $warn"

         exit1

        if [$sw -lt 20];then

        echo " your mermory is not enough,please check on"

        exit 2

       fi

 else

       echo " the memory is running normal"

      exit 0

fi