Vector Overlapping Areas

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Q: How can I determine the number of overlapping features per location after import of SHAPE file?

A: You can run this (example): dsn=./shp/ layer=fireHistory output=fireHistory
  v.category input=fireHistory output=tmpFire
  v.db.addtable map=tmpFire table=tmpFire_2 layer=2 columns='num,int' map=tmpFire layer=2 qlayer=1 option=query col=num qcol='count(*)' type=centroid
  # Export it to a raster layer: input=tmpFire layer=2 output=mf use=attr column=num