Shell脚本查看LINUX系统 网卡实时流量

#!/bin/bash
while [ \"1\" ]
do
eth=$1
RXpre=$(cat /proc/net/dev | grep $eth | tr : \" \" | awk \'{print $2}\')
TXpre=$(cat /proc/net/dev | grep $eth | tr : \" \" | awk \'{print $10}\')
sleep 1
RXnext=$(cat /proc/net/dev | grep $eth | tr : \" \" | awk \'{print $2}\')
TXnext=$(cat /proc/net/dev | grep $eth | tr : \" \" | awk \'{print $10}\')
clear
echo  -e  \"t RX `date +%k:%M:%S` TX\"
RX=$((${RXnext}-${RXpre}))
TX=$((${TXnext}-${TXpre}))
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 $1/1024 \"KB/s\"}\')
fi
echo -e \"$eth t $RX   $TX \"
done