[Proj] Converting NZMG -> Lat Long

[Craig Whitmore]

>
> The link is:
>
> http://www.linz.govt.nz/apps/coordinateconversions/index.html?Advanced=0
>
> Depends how many you need to do?
>

Quite a few more than 5 .. is there a cs2cs command line I can use instead 
or alike?

Thanks