MAC address offline lookup

maclookup.sh

#!/bin/bash

MAC=$1
MAC=$(echo $MAC | tr [:lower:] [:upper:])
MAC=$(echo $MAC | tr ':' '-')

if [[ ! "$MAC" ]]
then
        echo 'Usage: maclookup $MACADDRESS'
        exit 1
fi

FILE=/usr/share/ieee-data/oui.txt
# get from https://www.scribd.com/document/35251216/Mac-Adrress-Listing or just install AirCrack-NG
OUI=$(echo $MAC | cut -d '-' -f 1-3)

RES=$(grep "$OUI" $FILE)
RES=$(echo $RES | cut -d ' ' -f 3-)

if [[ "$RES" ]]
then
        echo $RES
else
        echo '*UNKNOWN*'
fi