I have two line shapefiles. I want to find between them, where are located all shared segments and extract the new selection shapefile. Can anybody help me? I am using Quantum GIS. I know that in ArcGIS, there are a tool, named "share line segment with". There is some tool like this in Quantum GIS or other open source software?
go to Vector -> Geoprocessing Tools -> Intersect; select the two shapefiles you want to analyse and set a name and location for the result shapefile.
Is this what you wanted?