linux 之 實時監控腳本

http://www.jb51.net/article/112965.htm

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