[FWTools] Convert dgn to shapefile

[HIWI-CAD]

Hi,
i´m trying to convert a dgn file to a shpefile. The dgn file contains annotation, Line, Point and polygon elements, but I only want to extract the line elements into a shapefile format. I have tried using the   -nlt LINE Command but this is not working.
 
Can anyone tell me how I could do this?
 
ogr2ogr -nlt LINESTRING -f "ESRI Shapefile" Path to shpfile path to dgnfile
 
Thankyou,
Robert Buckley
Zweckverband Großraum Braunschweig, Germany
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