shell: quick linux scripts for showing network bandwidth or packets-per-second

netpps.sh

#!/bin/bash


if [ -z "$1" ]; then
        echo
        echo usage: $0 network-interface
        echo
        echo e.g. $0 eth0
        echo
        echo shows packets-per-second
        exit
fi

IF=$1

while true
do
        R1=`cat /sys/class/net/$1/statistics/rx_packets`
        T1=`cat /sys/class/net/$1/statistics/tx_packets`
        sleep 1
        R2=`cat /sys/class/net/$1/statistics/rx_packets`
        T2=`cat /sys/class/net/$1/statistics/tx_packets`
        TXPPS=`expr $T2 - $T1`
        RXPPS=`expr $R2 - $R1`
        echo "tx $1: $TXPPS pkts/s rx $1: $RXPPS pkts/s"
done

netspeed.sh

#!/bin/bash

 
if [ -z "$1" ]; then
        echo
        echo usage: $0 network-interface
        echo
        echo e.g. $0 eth0
        echo
        exit
fi

IF=$1

while true
do
        R1=`cat /sys/class/net/$1/statistics/rx_bytes`
        T1=`cat /sys/class/net/$1/statistics/tx_bytes`
        sleep 1
        R2=`cat /sys/class/net/$1/statistics/rx_bytes`
        T2=`cat /sys/class/net/$1/statistics/tx_bytes`
        TBPS=`expr $T2 - $T1`
        RBPS=`expr $R2 - $R1`
        TKBPS=`expr $TBPS / 1024`
        RKBPS=`expr $RBPS / 1024`
        echo "tx $1: $TKBPS kb/s rx $1: $RKBPS kb/s"
done

example:

# sh netspeed.sh  eth0
tx eth0: 6308 kb/s rx eth0: 98 kb/s
tx eth0: 6921 kb/s rx eth0: 109 kb/s
tx eth0: 6773 kb/s rx eth0: 109 kb/s
tx eth0: 6798 kb/s rx eth0: 109 kb/s
tx eth0: 6731 kb/s rx eth0: 105 kb/s
tx eth0: 6805 kb/s rx eth0: 106 kb/s
tx eth0: 6898 kb/s rx eth0: 109 kb/s
tx eth0: 8655 kb/s rx eth0: 134 kb/s
tx eth0: 9659 kb/s rx eth0: 153 kb/s