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Post  Post subject: Linux script for interface network bandwidth monitoring  |  Posted: Mon Feb 09, 2015 7:05 pm
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Linux script for interface network bandwidth monitoring

This is a simple script that gets RX / TX values of an interface from /sys pseudo filesystem and calculate difference between current and old values displaying a bandwidth output for kilobytes per second.
Code:
#!/bin/bash
INT="1"  # every INT seconds

while true
do
        RX1=`cat /sys/class/net/$1/statistics/rx_bytes`
        TX1=`cat /sys/class/net/$1/statistics/tx_bytes`
        sleep $INT
        RX2=`cat /sys/class/net/$1/statistics/rx_bytes`
        TX2=`cat /sys/class/net/$1/statistics/tx_bytes`
        TXBPS=`expr $TX2 - $TX1`
        RXBPS=`expr $RX2 - $RX1`
        TXKBPS=`expr $TXBPS / 1024`
        RXKBPS=`expr $RXBPS / 1024`
        echo "TX $1: $TXKBPS kb/s RX $1: $RXKBPS kb/s"
done

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