一個簡單的監控網絡流量的腳本

#!/bin/sh

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=$(( ( $send_n - $send_o ) / $i))
    recv_ra=$(( ( $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