Shell script to monitor the real-time transmission rate specified NIC

This script is accidentally saw a large network of God written, published, did not retain the original link, thank provided, invasion deleted.

 

The principle: by reading a / proc / net / dev dynamic files per second, calculated draw speed. Execution format

sh ./speedmonitor. sh eth0 and the

 

Script details:

#!/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