Information about GRASS GIS 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 gcore print gcore.version()
g.version GRASS 7.0.0svn (2014)
g.version -r GRASS 7.0.0svn (2014) libgis Revision: 63222 libgis Date: 2014-11-28 10:04:17 +0100 (Fri, 28 Nov 2014)
g.version -rge version=7.0.0svn date=2014 revision=63285M build_date=2014-12-03 build_platform=x86_64-unknown-linux-gnu libgis_revision=63222 libgis_date="2014-11-28 10:04:17 +0100 (Fri, 28 Nov 2014) " proj4=4.8.0 gdal=1.10.1 geos=3.4.2 sqlite=3.8.7
Last changed: $Date: 2014-12-09 18:31:29 +0100 (Tue, 09 Dec 2014) $