$ system_profiler SPSoftwareDataType
Software:

    System Software Overview:

      System Version: macOS 10.12.5 (16F73)
      Kernel Version: Darwin 16.6.0
      ...

##</code><code>##

$ sw_vers -productVersion
10.12.5

##</code><code>##

my @names = qw( Cheetah Puma Jaguar Panther Tiger Leopard ) ;
push @names, 'Snow Leopard', 'Lion', 'Mountain Lion',
        'Mavericks', 'Yosemite', 'El Capitan', 'Sierra',
        'High Sierra', 'Mojave';