moo's oui lookup

#!/bin/bash

if [ ! -e oui.txt ];then
    echo "oui.txt not found. Grabbing current copy."
    curl -k http://linuxnet.ca/ieee/oui.txt -o ./oui.txt
fi

if [ ! -e cow.txt ];then
    echo "Grabbing Banner"
    curl -k https://gist.githubusercontent.com/piratemoo/0caed777e210efc5a65a10574e8be0bd/raw/7d20aa7f8b02e0a0ec22373259e78b172e75cf84/cow.txt -o ./cow.txt
fi

cat cow.txt && echo ""

options=(
	"Lookup by oui?"
	"Lookup by vendor?"
	"Update OUI?"
	"Quit"
	)
select option in "${options[@]}"
do
    case "$REPLY" in
        1) echo "Enter first octet of oui (i.e. 34:A4):"
	read input;
	processed=$(echo $input | sed  -e 's/:/-/g')
	cat oui.txt |grep $processed
	;;
        2) echo "Enter the vendor name:"
	read input;
	cat oui.txt | grep $input ;;
	3) echo "Update OUI txt file"
	old=$(wc -c < oui.txt)
	new=$(curl -sI http://linuxnet.ca/ieee/oui.txt | awk '/Content-Length/ {sub("\r",""); print $2}')
		if [ $old != $new ]; then
	rm oui.txt
	curl -k http://linuxnet.ca/ieee/oui.txt -o ./oui.txt
		echo "It's lit fam"
	else
		echo "OUI is up to date fam."
	fi
	;;
	4) break ;;
	*) echo "Please select a valid option" ;;
    esac
done