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#!/bin/sh
# network activity
[ ! -f /tmp/netactup ] || touch /tmp/netactup
[ ! -f /tmp/netactdown ] || touch /tmp/netactdown
# generate a list of devices
net_devices=$(ls /sys/class/net | grep -E "[ew]")
# get previous results
rx_prev=$(cat /tmp/netactdown)
tx_prev=$(cat /tmp/netactup)
# convert results to integers
if [ -n "$rx_prev" ] && [ -n "$tx_prev" ] ; then
rx_prev=$(($rx_prev))
tx_prev=$(($tx_prev))
fi
# declare send and recieve variables
rx_now=0
tx_now=0
# convert variables to integers
rx_now=$(($rx_now))
tx_now=$(($tx_now))
# iterate through each device
for device in $net_devices; do
rx_dev=$(cat /sys/class/net/"${device}"/statistics/rx_bytes)
tx_dev=$(cat /sys/class/net/"${device}"/statistics/tx_bytes)
rx_now=$(($rx_now + $rx_dev))
tx_now=$(($tx_now + $tx_dev))
done
# caculate amount send and recieved
down_total=$((rx_now - rx_prev))
up_total=$((tx_now - tx_prev))
echo $rx_now > /tmp/netactdown
echo $tx_now > /tmp/netactup
echo "D: $(numfmt --to=iec $down_total) U: $(numfmt --to=iec $up_total)"
#echo "D:" $down_total "U:" $up_total
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