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$ system_profiler SPSoftwareDataType
Software:
...
      System Version: macOS 10.12.5 (16F73)
      Kernel Version: Darwin 16.6.0
      ...

$ sw_vers -productVersion
10.12.5

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