MAC address lookup

maclookup.sh

#!/bin/bash

# Require 1 parameter
if [ $# -lt 1 ] || [[ ${#1} -lt 6 ]] || [[ "$1" = *"-h"* ]] ; then
	echo "MAC lookup tool by njd"
	echo "Usage: ${0##*/} MAC"
	echo
	echo "Dependencies: curl, grep, awk, sed, cut"
	echo "Automatically downloads http://standards-oui.ieee.org/oui.txt"
	echo
	echo "Required parameter - MAC address in any of the following formats:"
	echo " ##:##:##[:##:##:##]"
	echo " ##-##-##[-##-##-##]"
	echo " ######[######]"
	echo
	echo "example usage: ${0##*/} 8b:ad:de:ad:be:ef"
	echo "example usage: ${0##*/} 8b-ad-de-ad-be-ef"
	echo "example usage: ${0##*/} 8baddeadbeef"
	echo "example usage: ${0##*/} 8b:ad:de"
	echo "example usage: ${0##*/} 8b-ad-de"
	echo "example usage: ${0##*/} 8badde"
	echo
	exit 1
fi

#bname=$(basename "$0") #${0##*/}
dname=$(dirname "$0")

cd "$dname" || exit 1

touch -d "$(date -d '30 days ago')" 30DAYSAGO

if ! [ -f oui.txt ] || [ oui.txt -ot 30DAYSAGO ]
then
	echo "Downloading IEEE MA-L (MAC Vendors)."
	curl --progress-bar --compressed --remote-name http://standards-oui.ieee.org/oui.txt
	grep -F "(base 16)" oui.txt | awk '{$2=$3="" ; print $0}' | awk -F"   " '{print $1 ":" $2}' > tempOUI
	mv tempOUI oui.txt
fi

rm 30DAYSAGO>/dev/null 2>&1

mac=$1

mac=$(echo "$mac" | sed 's/-//g' | sed 's/\://g' | cut -c1-6 | awk '{print toupper($0)}')

vendor=$(grep -m 1 ^"$mac" oui.txt | awk -F':' '{print $2}')

echo "$mac : $vendor"

exit 0