mac.sh

#!/bin/bash

INTERFACE="en0"
MACCMD="ifconfig $INTERFACE ether"
MACREAL="aa:aa:aa:aa:aa:aa"
MACFAKE="bb:bb:bb:bb:bb:bb"

function usage {
        echo "Usage:"
        echo "  mac fake"
        echo "  mac real"
        echo "  mac show"
}

function showmac {
        CURRENTMAC=$(ifconfig en0 | grep ether | awk '{print $2}')
        echo "MAC Address is $CURRENTMAC"
}

if [[ "$#" -ne 1 ]]; then
        usage
fi

case "$1" in

real)
        sudo $MACCMD $MACREAL
        showmac
        ;;
fake)
        sudo $MACCMD $MACFAKE
        showmac
        ;;
show)
        showmac
        ;;
gen)
        RANDMAC=$(openssl rand -hex 6 | sed 's/\(..\)/\1:/g; s/.$//')
        echo "New random MAC Address:"
        echo "   $RANDMAC"
        ;;
*)
        usage
        ;;
esac