getting an icloud id for ssh connection

icloudssh.sh

#!/bin/bash

if [ ! -n "$1" ]
then
    echo "Usage: `basename $0` hostname"
    exit $E_BADARGS
fi

HOSTNAME=$1
DOMAIN=$(echo show Setup:/Network/BackToMyMac | scutil | sed -n 's/.* : *\(.*\).$/\1/p')

echo "Connecting to :" ${HOSTNAME}.${DOMAIN}"..."
ssh ${HOSTNAME}.${DOMAIN}