[GRASS-user] how to change all cats in a vector line

[Markus Neteler]

On Sat, Nov 29, 2014 at 6:16 AM, Michael Barton <Michael.Barton at asu.edu> wrote:
> I have a vector line that is divided into 12 cat values. I’d like all of the
> line to have a single cat value. I’ve tried v.category to no avail. If I
> delete all categories and then add new categories, I get 12 cats again. And
> I can find no other way to get a single cat for the entire line. Hopefully
> someone can tell what I’m missing here.

Please try to use
http://grass.osgeo.org/grass70/manuals/v.build.polylines.html

Markus