By entering defaults read LoginWindow , you can pull the raw version string that the system boots with. Type the command sw_vers and press return.
How to Use Your macOS Version Info for Troubleshooting
Open the System Settings app from the Dock or Spotlight search. Click the Apple logo in the top-left corner of the screen.
Knowing exactly what macOS version you are running is the first step toward troubleshooting, security, and planning any upgrade. The operating system rebranded itself from OS X to macOS to align with iOS, watchOS, and tvOS, but the history sometimes causes uncertainty.
How to Use Your macOS Version Info for Troubleshooting
Select "About" at the top of the right-hand pane. When a browser warns that a plugin is outdated, when a creative suite requests specific system requirements, or when a technician asks for your build number, they are referencing this exact version string.
More About What macos version do i have
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