一个显示实时网速代码

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#!/bin/bash
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while [ "1" ]
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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 $10}')
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clear
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echo  -e  "\t RX `date +%k:%M:%S` TX"
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RX=$((${RXnext}-${RXpre}))
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TX=$((${TXnext}-${TXpre}))
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if [[ $RX -lt 1024 ]];then
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RX="${RX}B/s"
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elif [[ $RX -gt 1048576 ]];then
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RX=$(echo $RX | awk '{print $1/1048576 "MB/s"}')
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else
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RX=$(echo $RX | awk '{print $1/1024 "KB/s"}')
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fi
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if [[ $TX -lt 1024 ]];then
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TX="${TX}B/s"
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elif [[ $TX -gt 1048576 ]];then
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TX=$(echo $TX | awk '{print $1/1048576 "MB/s"}')
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else
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TX=$(echo $TX | awk '{print $1/1024 "KB/s"}')
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fi
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echo -e "$eth \t $RX   $TX "
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done