트래픽 체크

#/bin/sh

dev=eth0

while ( true ) ; do
echo '<br>'
rx1=`grep $dev /proc/net/dev | awk '{print $1}' | sed 's/.*://'`
tx1=`grep $dev /proc/net/dev | awk '{print $9}'`
sleep 3
rx2=`grep $dev /proc/net/dev | awk '{print $1}' | sed 's/.*://'`
tx2=`grep $dev /proc/net/dev | awk '{print $9}'`

# 1024/8 == 128
rx3=$(((rx2-rx1)/128/3))
tx3=$(((tx2-tx1)/128/3))

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