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It is defaults with an s. And you can try this to narrow down the search:
Code:
defaults find .scaling|grep Global -A 5
 
The command "defaults find scaling" searches all of your preferences for the text "scaling". If you just want to disable mouse pointer acceleration, then enter the following command:

defaults write -g com.apple.mouse.scaling -float -1

Note: The change won't take effect until you next log in.
 
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