监控Linux内存使用情况

cat mem.sh
#!/bin/bash
IP=`ifconfig | grep 'inet ' | grep -v '127.0.0.1' | awk -F ' ' '{print $2}'| awk -F':' '{print $2}'| head -n 1`     //获取IP
MAX_mem=95
MAX_swap=20
Men=`free | awk '/Mem/ {print int($3/$2*100)}'`  //物理内存
SWAP=`free | awk '/Swap/ {print int($3/$2*100)}'`   //虚拟内存
     if [ $Men -gt $MAX_mem -o $SWAP -gt $MAX_swap ];then
        echo "Men Warning" | /usr/local/mutt/bin/mutt -s "$IP Men Warning " 28145***@qq.com
     fi