실시간 트래픽 체크

#!/bin/bash 

echo "Time : receive (Kbit/Sec) / transmit (Kbit/Sec)"

while ( true ) ;
do
rx1=`grep eth0 /proc/net/dev | awk '{print $1}' | sed 's/.*://'`

tx1=`grep eth0 /proc/net/dev | awk '{print $9}'`

sleep 3

rx2=`grep eth0 /proc/net/dev | awk '{print $1}' | sed 's/.*://'`

tx2=`grep eth0 /proc/net/dev | awk '{print $9}'`

rx3=$(((rx2-rx1)/128/3))

tx3=$(((tx2-tx1)/128/3))

echo "`date '+%k:%M:%S'` : $rx3 / $tx3"

done