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#!/bin/bash
IFACE=${1:-wlp8s0}
while true; do
OLD=$(awk -v i="$IFACE:" '$1==i {print $2, $10}' /proc/net/dev)
sleep 1
NEW=$(awk -v i="$IFACE:" '$1==i {print $2, $10}' /proc/net/dev)
OLD_RX=$(echo $OLD | awk '{print $1}')
OLD_TX=$(echo $OLD | awk '{print $2}')
NEW_RX=$(echo $NEW | awk '{print $1}')
NEW_TX=$(echo $NEW | awk '{print $2}')
RX=$(( (NEW_RX - OLD_RX) / 1024 ))
TX=$(( (NEW_TX - OLD_TX) / 1024 ))
echo "↓ ${RX} KB/s ↑ ${TX} KB/s"
done
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