查看网卡流量的小脚本

filename flow.sh

#!/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

flow.sh eth0