coordinate conversion

How do I convert coordinates from lat/long WGS84
to 1. lat/long WGS72
   2. UTM NAD83 (GRS80), and
   3. UTM NAD27 (clark66)
using GRASS m.* commands?
using Evenden's PROJ.4?

Please Cc mccauley@ecn.ppordue.edu on any replies.
Thanks,

--
James Darrell McCauley, PhD
Purdue University
mccauley@ecn.purdue.edu