查看网卡速率脚本

centos7.4和ubuntu20.04，实时打印网卡速率脚本：

#!/bin/bash

function up_interfaces()
{
	itfs=`ip a | grep 'state UP' | awk '{print $2}' | awk -F : '{print $1}'`
	itfs=(${itfs// / })  
	 
	echo "all state UP interfaces:"
	for itf in ${itfs[@]}
	do
		uname -a | grep Ubuntu >> /dev/null
		if [ $? -eq 0 ]; then
			ip a | grep inet | grep $itf | awk '{print "\t" $8 ": " $2}'
		else
			ip a | grep inet | grep $itf | awk '{print "\t" $7 ": " $2}'
		fi
	done 
}

if [ $# -lt 1 ] ; then
	echo "parameters error"
	echo -e "\t$0 [interface]"
	echo
	up_interfaces
	exit
fi

interface=$1

while true
do
	info_1=`cat /proc/net/dev`
	nanoSec_1=`date +%s%N`
	sleep 1
	info_2=`cat /proc/net/dev`
	nanoSec_2=`date +%s%N`

	TX_1=`echo ${info_1#*$interface} | awk '{print $10}'`
	RX_1=`echo ${info_1#*$interface} | awk '{print $2}'`

	TX_2=`echo ${info_2#*$interface} | awk '{print $10}'`
	RX_2=`echo ${info_2#*$interface} | awk '{print $2}'`

	TX=$((${TX_2}-${TX_1}))
	RX=$((${RX_2}-${RX_1}))
	nanoSec=$((${nanoSec_2}-${nanoSec_1}))

	second=`echo $nanoSec | awk '{print $1/1000000000}'`
	TX=`echo "$TX $second" | awk '{printf  ("%.4f\n", $1/$2/1048576*8)}'`
	RX=`echo "$RX $second" | awk '{printf  ("%.4f\n", $1/$2/1048576*8)}'`

	echo -e "`date +%k:%M:%S` \t TX: ${TX} Mbps/s \t\t RX: ${RX} Mbps/s"
done
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