mac-spoof.sh

#!/usr/bin/env bash
#
# Generate a random mac address, the old fashioned way.

# Ensure we are running as root.
if [ "$(id -u)" != "0" ]; then
  echo "This script must be run as root." 2>&1
  exit 1
fi

# Check we have the device defined.
if [ $# -eq 0 ]; then
    echo "You have not passed through a device name such as wlan0. Please"
    echo "check the usage example."
    echo
    echo "  Usage:"
    echo "    sudo mac-spoof wlan0"
fi

DEVICE=$1

FRESH_MAC=$(openssl rand -hex 6 | sed 's/\(..\)/\1:/g; s/.$//')

ifconfig $DEVICE down
ifconfig $DEVICE hw ether $FRESH_MAC
ifconfig $DEVICE up