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#!/bin/sh # # Checks if the given interface matches the given ethernet MAC. # If it does it exits with 0 (success) status; # if it doesn't then it exists with 1 (error) status. set -e export LANG=C if [ ! "$1" -o ! "$2" ]; then echo "Usage: $0 IFACE targetMAC" exit 1 fi ip -brief link show dev "$1" | read iface state mac rest targetmac=`echo "$2" | tr A-F a-f` test "$targetmac" = "$mac"