统计网卡流量的两段shell脚本(使用ifconfig) 详细出处参考：http://www.jb51.net/article/34290.htm

代码一：

#!/bin/bash
# 统计网卡流量
# link：www.jb51.net
# date：2013/2/26
n=10

date
rm -rf /tmp/ifconfig_log
while (( $n >= 0 ))
do
n=$(($n - 1));
date >> /tmp/ifconfig_log
ifconfig eth1 >> /tmp/ifconfig_log
sleep 1
done

grep "RX bytes:" /tmp/ifconfig_log | awk -F"[:| ]" '{print $13}' | awk 'BEGIN{tmp=$1}{if(FNR > 1)print $1-tmp}{tmp=$1}'

代码二：

#!/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 "=================================================="
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"
echo "=================================================="
done

详细出处参考：http://www.jb51.net/article/34290.htm