#!/bin/sh

case `uname -s` in
  Darwin|FreeBSD|SunOS)
    netstat -rn | grep default | awk '{print $2}' # $
    ;;
  Linux)
    netstat -rn | grep ^0.0.0.0 | awk '{print $2}' # $
    ;;
  *)
    echo 'unknown'
    ;;
esac