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How to setup a custom login screen message on macOS

Updated 2021-12-01 · Published 2016-12-11

You can display a custom message to be displayed on the login screen of your macOS system. This is different from setting a policy banner that a user must accept before they are allowed to continue. Run the following command from the terminal in order to enable or disable a custom message.

Enable a custom message

sudo defaults write /Library/Preferences/ LoginwindowText "powered by"

Disable a custom message

sudo defaults delete /Library/Preferences/ LoginwindowText