Linux 查看实时网卡流量的方法 nload sar iftop

yum install -y gcc gcc-c++ ncurses-devel make wget

wget http://www.roland-riegel.de/nload/nload-0.7.4.tar.gz

tar zxf nload-0.7.4.tar.gz && cd nload-0.7.4 &&  ./configure && make && make install

 # nload ens33

 # cat flow

#!/bin/bash

ethn=$1

while true
do
  RX_pre=$(cat /proc/net/dev | grep $ethn | sed ‘s/:/ /g‘ | awk ‘{print $2}‘)
  TX_pre=$(cat /proc/net/dev | grep $ethn | sed ‘s/:/ /g‘ | awk ‘{print $10}‘)
  sleep 1
  RX_next=$(cat /proc/net/dev | grep $ethn | sed ‘s/:/ /g‘ | awk ‘{print $2}‘)
  TX_next=$(cat /proc/net/dev | grep $ethn | sed ‘s/:/ /g‘ | awk ‘{print $10}‘)

  clear
  echo -e "\t RX `date +%k:%M:%S` TX"

  RX=$((${RX_next}-${RX_pre}))
  TX=$((${TX_next}-${TX_pre}))

  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 "$ethn \t $RX   $TX "

done

# bash flow ens33

         RX  5:36:49 TX
ens33    259.268KB/s   2.26172KB/s

yum -y install flex byacc  libpcap ncurses ncurses-devel libpcap-devel

wget http://www.ex-parrot.com/pdw/iftop/download/iftop-0.17.tar.gz

tar zxvf iftop-0.17.tar.gz && cd iftop-0.17

./configure && make && make install

# iftop

 Reference：Linux流量监控工具 - iftop (最全面的iftop教程)

 iftop虽然也有图形化，但是无效内容太多，单一需求使用nload比较方便