How do you find the number of cpus on a solaris system?

Since the new SVR4-based OS was not expected to ship in volume until the following year, Sun, in a move destined to sow confusion, immediately began using the new Solaris name to refer to the currently shipping SunOS 4 release (also including OpenWindows). Thus SunOS 4.1.1 was rechristened Solaris 1.0; SunOS 5.0 would be considered a part of Solaris 2.0. SunOS 4.1.x micro versions continued to be released through 1994, and each of these was also given a Solaris 1.x equivalent name. In practice, these were often still referred to by customers and even Sun personnel by their SunOS release names. Matching the version numbers was not straightforward: