OSのリビジョンかね

% cat /etc/release
Solaris 9 8/03 s9x_u4wos_08b x86
Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.
Use is subject to license terms.
Assembled 17 June 2003
% pkginfo -l SUNWpng
VERSION: 11.9.0,REV=2002.03.02.00.30
PSTAMP: sfw81-x20020302003306