19 lines
424 B
Plaintext
19 lines
424 B
Plaintext
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#!/bin/sh
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update() {
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sum=0
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for arg; do
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read -r i < "$arg"
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sum=$(( sum + i ))
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done
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cache=/tmp/${1##*/}
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[ -f "$cache" ] && read -r old < "$cache" || old=0
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printf %d\\n "$sum" > "$cache"
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printf %d\\n $(( sum - old ))
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}
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rx=$(update /sys/class/net/[ew]*/statistics/rx_bytes)
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tx=$(update /sys/class/net/[ew]*/statistics/tx_bytes)
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printf "%4sB ↕ %4sB\\n" $(numfmt --to=iec $rx $tx)
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