Information about GRASS core GIS Library can be printed by -r flag.
Version numbers of additional libraries like PROJ.4, GDAL/OGR or GEOS are printed by -e flag.
See also function version() from Python Scripting Library.
import grass.script as grass print grass.version()
g.version GRASS 7.0.svn (2012)
g.version -r GRASS 7.0.svn (2012) libgis Revision: 52468 libgis Date: 2012-07-27 22:53:30 +0200 (Fri, 27 Jul 2012)
g.version -rge version=7.0.svn revision=53670 date=2012 libgis_revision=52468 libgis_date="2012-07-27 22:53:30 +0200 (Fri, 27 Jul 2012) " proj4=4.8.0 gdal=1.9.2 geos=3.3.5 sqlite=3.7.14.1
Last changed: $Date$