#!/bin/bash
 while [ "1" ]
 do
 eth=$1
 RXpre=$(cat /proc/net/dev | grep $eth | tr : " " | 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 $10}')
 clear
 echo  -e  "\t RX `date +%k:%M:%S` TX"
 RX=$((${RXnext}-${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 $RX   $TX "
 done
 

将上面的脚本保存为watch-net.sh

执行：

sh watch-net.sh ethX

即可。

注：ethX指的是你要看的网卡名称

注意：必须在linux下创建文件, 在windows下创建的文件拷到linux下执行会报出各种语法错误