v.net.path(1grass) on Linux
The text 2778351dff13, as Debian 4.0 (Etch) shipped it.
Find shortest path on vector network. Reads start/end pointsfrom standard input in 2 possible formats: id start_point_category end_point_category id start_point_x start_point_y end_point_x end_point_y Points specified by category must be exactly on network nodes.