网络流量监控脚本

#!/bin/bash

ROOT_UID=0
E_NOTROOT=67
i=0

if [ "$UID" -ne "$ROOT_UID" ]; then
echo "Must be root to run this script."
exit $E_NOTROOT
fi

if [ -n "$1" ]; then
eth_name=$1
else
eth_name="eth0"
fi

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
exit 0