#!/bin/bash

# ranmac.sh - by dual
# Generates random MAC address
# Usage: sh ranmac.sh | sed 's/:$//'

# Declare variables
cnt=0
low=16
maxcnt=6

# Generate and print random MAC
ranmac()
{
	num=0
	while [ "$num" -lt "$low" ]; do
		num=$RANDOM
		let "num %= 256"
	done
	printf "%x:" "$num"
}

while [ "$cnt" -lt "$maxcnt" ]; do
	devran=$(head -1 /dev/urandom | od -N 1 | awk '{ print $2 }')
	RANDOM="$devran"
	ranmac
	let "cnt += 1"
done