Unset core.editor in Msysgit

I set my editor per an SO entry: How do I setup DiffMerge with msys开发者_如何学编程git / gitk?.

I'm wondering how to undo this because I want to switch back to the default editing program.

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Depending on how you ran git config...

git config --unset core.editor

Or

git config --global --unset core.editor