> > g.region vect=NZMG_s27
> > v.in.region output=cutter type=line --overwrite
> > v.overlay ainput=wellington_contours atype=line \
> > binput=cutter output=clipped operator=and
and I think you'll want v.in.region to use type=area, not line, otherwise
you risk only to get contour lines which cross the boundary and not those
that fall within it.
Hamish