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Playing around with some low level functions to monitor my system stats.

I would like to get the current network utilization the same way like I can get cpu temp

cat /sys/class/thermal/thermal_zone0/temp

or fan speed

cat /sys/class/hwmon/hwmon6/fan1_input

Looking at

/sys/class/net/my_network_adapter/

I didn't find a way to see the actual bandwidth consumption, rx_bytes just gives the total amount of data downloaded.

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  • You want to monitor the traffic in B/s?
    – Quasímodo
    Aug 17, 2020 at 19:39
  • Yes thats what I want. Aug 19, 2020 at 9:26

2 Answers 2

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To get the rate of B/s, no need of anything but your shell: Simply read rx_bytes file at each second and compare the current value with the value one second before.

rx1=$(cat /sys/class/net/wlp3s0/statistics/rx_bytes)
while sleep 1; do
    rx2=$(cat /sys/class/net/wlp3s0/statistics/rx_bytes)
    printf 'Download rate: %s B/s\n' "$((rx2-rx1))"
    rx1=$rx2
done

Of course, substitute wlp3s0 by the interface you want to monitor.

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  • thats a nice little trick, will try it, thanks Aug 20, 2020 at 10:24
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The Linux kernel doesn't keep track of the temporal network interface stats - you have to calculate the values by yourself.

There are multiple utilities and applications which do that for you, including Gnome System Monitor if you're a Gnome user, then KDE has KSysGuard/Plasma Network Monitor/KNemo and many others.

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  • ok this means I cannot avoid using one of the "bloated" tools - I really liked the idea of using the lowest level command to keep workload at minimum, similar to the already mentioned methods. Aug 17, 2020 at 17:11
  • 1
    Speaking of bloat, there are console utilities to monitor network utilization as well: iftop, ifstat, nload, bmon, iptraf, cbm, bwm-ng, speedometer, netload, dstat and many more. Aug 17, 2020 at 17:30

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