Get interface name and mac address grouped by vendor and device

nic_mac_list_by_vendor_device.sh

#!/bin/bash
OLDIFS=$IFS
IFS=$'\n'

mapfile -t NIC_MODEL < <(lspci | grep -i ethernet | sed 's@[[:alnum:]]\+:[[:alnum:]]\+\.[[:alnum:]]\+\s*@@' | uniq)

IFS=${OLDIFS}

for (( i=0; i < ${#NIC_MODEL[@]}; i++ ))
do
    echo ${NIC_MODEL[${i}]}

    for addr in $(lspci | grep -i "${NIC_MODEL[${i}]}" | awk '{print $1}')
    do
        BUS=/sys/bus/pci/devices/$(ls /sys/bus/pci/devices | grep "${addr}")
        for device in $(ls ${BUS}/net)
        do
            echo ${device}
            cat ${BUS}/net/${device}/address
        done
    done
    echo
done