#!/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