实时查看linux网卡流量 的base脚本

#!/bin/bash
 while [ "" ]
 do
 eth=$
 RXpre=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $2}')
 TXpre=$(cat /proc/net/dev | grep $eth | tr : " " | awk '{print $10}')
 sleep
 RXnext=$(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 [[ $RX -lt  ]];then
 RX="${RX}B/s"
 elif [[ $RX -gt  ]];then
 RX=$(echo $RX | awk '{print $1/1048576 "MB/s"}')
 else
 RX=$(echo $RX | awk '{print $1/1024 "KB/s"}')
 fi

if [[ $TX -lt  ]];then
 TX="${TX}B/s"
 elif [[ $TX -gt  ]];then
 TX=$(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