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#!/bin/bash

eth0=$1

while true
do
RX_pre=$(cat /proc/net/dev | grep eth0 | sed 's/:/ /g' | awk '{print $2}')
TX_pre=$(cat /proc/net/dev | grep eth0 | sed 's/:/ /g' | awk '{print $10}')
sleep 1
RX_next=$(cat /proc/net/dev | grep eth0 | sed 's/:/ /g' | awk '{print $2}')
TX_next=$(cat /proc/net/dev | grep eth0 | sed 's/:/ /g' | awk '{print $10}')

clear
echo -e "\t RX `date +%k:%M:%S` TX"

RX=$((${RX_next}-${RX_pre}))
TX=$((${TX_next}-${TX_pre}))

if [[ $RX -lt 1024 ]];then
RX="${RX}B/s"
elif [[ $RX -gt 1048576 ]];then
RX=$(echo $RX | awk '{print $1/1048576 "MB/s"}')
else
RX=$(echo $RX | awk '{print $1/1024 "KB/s"}')
fi

if [[ $TX -lt 1024 ]];then
TX="${TX}B/s"
elif [[ $TX -gt 1048576 ]];then
TX=$(echo $TX | awk '{print $1/1048576 "MB/s"}')
else
TX=$(echo $TX | awk '{print $1/1024 "KB/s"}')
fi

echo -e "$ethn \t $RX $TX "

done

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