Aliases localhost to an address

alias-local

#!/bin/bash

if [ "$(id -u)" != "0" ]; then sudo "${0}" "$@"; exit $?; fi

if [ "${1}" == "-d" ]; then
    [ -n "${2}" ] || { echo "Usage $0 [-d] <addr> [iface]"; exit 1; }
    ifconfig ${3:-lo0} -alias ${2}
else
    [ -n "${1}" ] || { echo "Usage $0 [-d] <addr> [iface]"; exit 1; }
    ifconfig ${2:-lo0} alias ${1} 255.255.255.255
fi