[GRASS-user] Collapsing many layers into 1

[Neil Godfrey]

Hello,

The census 2000 administrative boundaries are shapefiles, where every
county is a separate file.  So v.in.ogr creates a layer for every
county.  So for example, I get 83 layers for the 83 counties in
Michigan, which correspond to 83 tables, each with just one category.

What I want is one layer with 83 categories.  I've had no luck with
v.overlay, v.extract, v.patch, etc. because all those tools preserve the
layers in the output map.

Is there any way to do this?

Thanks,
Neil