I'm reading this article, it works.
But how can I turn off macOS Mojave screenshot preview thumbnails with defaults write command?
I just don't know the key value to use.
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The domain is com.apple.screencapture and the key is show-thumbnail.
So:
defaults write com.apple.screencapture show-thumbnail -bool TRUE
and
defaults write com.apple.screencapture show-thumbnail -bool FALSE
