The CLI usage could be dark-mode auto.
The dark mode in the appearance preferences object is boolean. Seems it's impossible to set appearance to auto with a simple AppleScript.
I found a discussion at https://macscripter.net/viewtopic.php?id=48730.
But if there is any other way to set appearance to auto, it would be a great feature.
sindresorhus / dark-mode
Control the macOS dark mode from the command-line
664
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