监测内存使用量、剩余量及网卡流量的shell脚本

#!/bin/bash
#program:
#监测网卡流量与内存使用情况
#filename：memory_inet.sh

if [ "$1" == "" ];then
   echo "格式为‘脚本名 网卡’，请重新执行!" && exit 0
fi
while true
do
 eth=$1
 RXpre=$(cat /proc/net/dev | grep $eth | tr : " " | linuxjishu/13830.html target=_blank class=infotextkey>awk '{print $2}')
 TXpre=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $10}')
 sleep 1
 RXnext=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $2}')
 TXnext=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $10}')
 clear
 echo  -e  "t `date +%k:%M:%S` "
 RX=$((${RXnext}-${RXpre}))
 TX=$((${TXnext}-${TXpre}))

 if [[ $RX -lt 1024 ]];then
  RX="${RX}B/s"
 elif [[ $RX -gt 1048576 ]];then
  RX=$(echo $RX | awk '{print $1/1048576 "MB/s"}')
 else
  RX=$(echo $RX | awk '{print $1/1024 "KB/s"}')
 fi

 if [[ $TX -lt 1024 ]];then
  TX="${TX}B/s"
 elif [[ $TX -gt 1048576 ]];then
  TX=$(echo $TX | awk '{print $1/1048576 "MB/s"}')
 else
  TX=$(echo $TX | awk '{print $1/1024 "KB/s"}')
 fi

 echo -e "$eth t 下载速率:$RX     上传速率:$TX "
 usemem=$(free -h | grep "cache:" | awk '{print $3}')
 idlemem=$(free -h | grep "cache:" | awk '{print $4}')
 echo " 已使用内存：$usemem 剩余内存：$idlemem"
done