[Gdal-dev] Change EXTENT of a shapefile

[shortyII]

Hi,
i am trying to change the EXTENT parameters of a shapefile with ogr2ogr:

ogr2ogr -update -spat 3500000 5300000 3540000 5400000 rastervorlage.shp
rastervorlage.shp
FAILED: Layer rastervorlage already exists, and -append not specified.
        Consider using -append, or -overwrite.
ERROR 1: Terminating translation prematurely after failed
translation of layer rastervorlage

but it doesn't work. (-append and -overwrite also don't work)
Is it in principal possible to change the extent and how can i do it?
Thank you!

Stefan 
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