v.category in=testmap option=report LAYER/TABLE 1/testmap: type count min max point 0 0 0 line 1379 1 1379 boundary 0 0 0 centroid 0 0 0 area 0 0 0 all 1379 1 1379
2) Delete all vector categories in layer 1
v.category in=testmap out=outmap option=del
3) Add vector categories in layer 1 with step=2
v.category in=outmap out=stepmap option=add step=2 LAYER/TABLE 1/outmap: type count min max point 0 0 0 line 1379 1 2757 boundary 0 0 0 centroid 0 0 0 area 0 0 0 all 1379 1 2757
4) Add categories/centroids to a vector map without categories
v.category in=wkt out=wktnew option=add
Results can be tested using d.what.vect.
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