On Sat, Mar 7, 2009 at 8:03 PM, Thybério Luna Freire <thyberio at gmail.com> wrote: > Hi Vincent, > I've tried the following command: > > v.patch -ae input=sugarcane,sugarcane_update output=sugarcane --o > > it returns: > ERROR: Output vector map <sugarcane> is used as input You have to write the output to a new map name. Markus