脚本实现监控网卡流量

脚本实现监控网络流量速率的代码：

#!/bin/bash
    if [ -n "$1" ]; then
    eth_name=$1
    else
    eth_name="eth0"
    fi
    i=0
    send_o=`ifconfig $eth_name | grep bytes | awk '{print $6}' | awk -F : '{print $2}'`
    recv_o=`ifconfig $eth_name | grep bytes | awk '{print $2}' | awk -F : '{print $2}'`
    send_n=$send_o
    recv_n=$recv_o
    while [ $i -le 100000 ]; do
    send_l=$send_n
    recv_l=$recv_n
    sleep 1
    send_n=`ifconfig $eth_name | grep bytes | awk '{print $6}' | awk -F : '{print $2}'`
    recv_n=`ifconfig $eth_name | grep bytes | awk '{print $2}' | awk -F : '{print $2}'`
    i=`expr $i + 1`
    send_r=`expr $send_n - $send_l`
    recv_r=`expr $recv_n - $recv_l`
    total_r=`expr $send_r + $recv_r`
    send_ra=`expr \( $send_n - $send_o \) / $i`
    recv_ra=`expr \( $recv_n - $recv_o \) / $i`
    total_ra=`expr $send_ra + $recv_ra`
    sendn=`ifconfig $eth_name | grep bytes | awk -F \( '{print $3}' | awk -F \) '{print $1}'`
    recvn=`ifconfig $eth_name | grep bytes | awk -F \( '{print $2}' | awk -F \) '{print $1}'`
    clear
    echo  "Last second  :   Send rate: $send_r Bytes/sec  Recv rate: $recv_r Bytes/sec  Total rate: $total_r Bytes/sec"
    echo  "Average value:   Send rate: $send_ra Bytes/sec  Recv rate: $recv_ra Bytes/sec  Total rate: $total_ra Bytes/sec"
    echo  "Total traffic after startup:    Send traffic: $sendn  Recv traffic: $recvn"
    done

默认是etho0，可带网卡名运行：
caltraffic bon1