[GRASS-user] importing a vector, problem with duplicate column name: cat_

[Markus Neteler]

On Thu, Aug 4, 2016 at 10:06 AM, Margherita Di Leo <diregola at gmail.com> wrote:
...
> Thank you for your suggestion. Do I understand correctly that this will add
> a third column? If in my work flow I have to import-process-export multiple
> times, this will add a column every time unless I explicitly drop a column?

... or just don't export it if you don't need the cat column:

https://grass.osgeo.org/grass72/manuals/v.out.ogr.html
-s Skip export of GRASS category ID ('cat') attribute

best
markusN