If you need to convert back from 6.0 into the 5.0/5.3/5.4 vector format, use v.out.ogr (to SHAPE format) and then v.in.shape in the old GRASS program. Alternatively use "v.out.ascii -o" and v.in.ascii.
As this GRASS version uses SQL for attribute management, there are some SQL restrictings concerning the file names. This script changes dots (e.g. "foo.bar") in old vector map names into underline(s) (e.g. "foo_bar").
v.convert.all -r
Last changed: $Date: 2011-09-04 06:23:30 -0700 (Sun, 04 Sep 2011) $