Network card Traffic Monitoring script (Shell)

#!/bin/bash# Traffic monitor# Author:xiao guaishouget_traffic_info () {recv=`Cat/proc/net/dev |awk-F'[: ]+' '/' "$dev"'/{print}'' Sent=`Cat/proc/net/dev |awk-F'[: ]+' '/' "$dev"'/{print $11}''}get_traffic_rate () { in=`Echo$[($RECV-$old _recv)/1024x768] ' out=`Echo$[($sent-$old _sent)/1024x768] '}read-P'Please enter the network card device name you want to monitor:'Devif!grep-qp"\b$dev\b:"/proc/net/Dev Then    Echo "the device you entered does not exist, or is not a legitimate network card device"Exit1fi while :;  DoGet_traffic_info old_recv=$recv old_sent=$sentSleep 1Get_traffic_info get_traffic_rateEcho-E"$dev \ninput:\t$in kb/s\noutput:\t$out kb/s\n" Done# End

Network card Traffic Monitoring script (Shell)