Turn Off macOS Mojave Screenshot Preview Thumbnails with defaults write command 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.
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