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#!/bin/sh
# Module showing network traffic. Shows how much data has been received (RX) or
# transmitted (TX) since the previous time this script ran. So if run every
# second, gives network traffic per second.
update() {
sum=0
for arg; do
read -r i < "$arg"
sum=$(( sum + i ))
done
cache=/tmp/${1##*/}
[ -f "$cache" ] && read -r old < "$cache" || old=0
printf %d\\n "$sum" > "$cache"
printf %d\\n $(( sum - old ))
}
rx=$(update /sys/class/net/[ew]*/statistics/rx_bytes)
tx=$(update /sys/class/net/[ew]*/statistics/tx_bytes)
printf "🔻%4sB 🔺%4sB\\n" $(numfmt --to=iec $rx $tx)
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