Use the following command to determine the version of the Sun Solaris operating system that is installed on your system:
cat /etc/release
The following output shows that the March 2005 (3/05) release is installed:
Solaris 10 3/05 s10_74L2a X86 Copyright 2005 Sun Microsystems, Inc. All Rights Reserved. Use is subject to license terms. Assembled 22 January 2005
The number 10 following the name Solaris indicates that the base operating system is Solaris 10.
Use the following command to list individual patches:
showrev -p