36 lines
963 B
Bash
36 lines
963 B
Bash
#!/usr/bin/env bash
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CACHE="/tmp/waybar-net"
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iface=$(ip route get 8.8.8.8 2>/dev/null | awk '{for(i=1;i<=NF;i++) if($i=="dev") print $(i+1)}' | head -1)
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if [ -z "$iface" ]; then
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echo "↑0B ↓0B"
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exit 0
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fi
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rx=$(cat /sys/class/net/$iface/statistics/rx_bytes 2>/dev/null || echo 0)
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tx=$(cat /sys/class/net/$iface/statistics/tx_bytes 2>/dev/null || echo 0)
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now=$(date +%s%3N)
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if [ -f "$CACHE" ]; then
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read -r prev_rx prev_tx prev_time < "$CACHE"
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dt=$(( now - prev_time ))
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[ "$dt" -le 0 ] && dt=1000
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up=$(( (tx - prev_tx) * 1000 / dt ))
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down=$(( (rx - prev_rx) * 1000 / dt ))
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else
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up=0; down=0
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fi
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echo "$rx $tx $now" > "$CACHE"
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fmt() {
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local b=$1
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if [ "$b" -ge 1073741824 ]; then printf "%4s" "$(( b / 1073741824 ))G"
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elif [ "$b" -ge 1048576 ]; then printf "%4s" "$(( b / 1048576 ))M"
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elif [ "$b" -ge 1024 ]; then printf "%4s" "$(( b / 1024 ))K"
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else printf "%4s" "${b}B"
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fi
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}
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echo "↑$(fmt "$up")/s ↓$(fmt "$down")/s"
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