How to Find the Version of the Oracle Solaris OS That Your System Is Running

To see the version of Oracle Solaris software that is running on your system, type either of the following commands.

$ uname -a

The cat command provides more detailed information.
 $ cat /etc/release

# uname -x
System = SunOS
Node = birdie
Release = 5.10
KernelID = Generic_142909-17
Machine = sun4v
BusType = <unknown>
Serial = <unknown>
Users = <unknown>
OEM# = 0
Origin# = 1
NumCPU = 32