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

hi
how can i see the live report like PRTG?

Thanks for sharing.
Works like a charm.

Thanks 💯

A bug in your scripts. If you represent bytes you need put B. If you like show bits, need pultiply by 8:

TKBPS=`expr $TBPS / 1024 \* 8`
RKBPS=`expr $RBPS / 1024 \* 8`

You can simply with:

TKBPS=`expr $TBPS / 128`
RKBPS=`expr $RBPS / 128`

thank you very much

Hi
nload shows big incomind traffic
How can I see what app generates it?

@nicdnepr You could try the nethogs utility for that

@joemiller in netspeed.sh you should use kB/s instead kb/s

@mdobrzyn Yep! thanks for pointing that out. Updated.

@nicnepr I came across this new (to me, at least) tool written in Rust that will show network usage by application. It's also cross-platform. Might want to check it out.

https://github.com/imsnif/bandwhich