#!/bin/bash

if [ -n "${1}" ];

then

NetDevice=${1};

else

NetDevice=wlp3s0;

fi

printf "|------ Time ------|---- NetIn ----|--- NetOUt ----|\n"

while true

do time=$(date +%F" "%T)

rx_before=$(ifconfig ${NetDevice}|awk -F' *|:' '{if($2=="RX"&&$3=="bytes") print $4}')

tx_before=$(ifconfig ${NetDevice}|awk -F' *|:' '{if($2=="RX"&&$3=="bytes") print $9}')

sleep 1

rx_after=$(ifconfig ${NetDevice}|awk -F' *|:' '{if($2=="RX"&&$3=="bytes") print $4}')

tx_after=$(ifconfig ${NetDevice}|awk -F' *|:' '{if($2=="RX"&&$3=="bytes") print $9}')

rx_result=$(((rx_after-rx_before)/1024))

tx_result=$(((tx_after-tx_before)/1024))

printf "|%19s|%10s kbps|%10s kbps|\n" "${time}" "${rx_result}" "${tx_result}"

# sleep 1

done