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#!/bin/bash
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while true
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do
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    eth=$1
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    RXpre=$(cat /proc/net/dev | grep "$eth" | tr : " " | awk '{print $2}')
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    TXpre=$(cat /proc/net/dev | grep "$eth" | tr : " " | awk '{print $10}')
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    sleep 1
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    RXnext=$(cat /proc/net/dev | grep "$eth" | tr : " " | awk '{print $2}')
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    TXnext=$(cat /proc/net/dev | grep "$eth" | tr : " " | awk '{print $10}')
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    clear
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    echo -e "\t RX `date +%H:%M:%S` TX"
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    RX=$((RXnext - RXpre))
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    TX=$((TXnext - TXpre))
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    format_speed() {
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        local value=$1
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        if [[ $value -lt 1024 ]]; then
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            echo "${value}B/s"
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        elif [[ $value -lt 1048576 ]]; then
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            awk "BEGIN {printf \"%.2fKB/s\", $value/1024}"
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        elif [[ $value -lt 1073741824 ]]; then
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            awk "BEGIN {printf \"%.2fMB/s\", $value/1048576}"
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        else
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            awk "BEGIN {printf \"%.2fGB/s\", $value/1073741824}"
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        fi
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    }
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    RX_FMT=$(format_speed $RX)
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    TX_FMT=$(format_speed $TX)
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    echo -e "$eth \t $RX_FMT \t $TX_FMT"
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done