Mac OS X Display Access Warnings Message For The Login Window

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To display access warnings message for the login window on a Mac running macOS X, you can use the following steps:

  1. Open the “Terminal” application on your Mac. You can find it in the “Utilities” folder within the “Applications” folder.
  2. Type the following command into the Terminal and press Enter:
sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "ACCESS WARNING: Unauthorized access to this system is prohibited."
  1. You will be prompted to enter your administrator password. Type it in and press Enter.
  2. The access warning message has now been set for the login window. You can log out and view the message by clicking on the Apple icon in the top left corner of the screen, selecting “Log Out”, and then viewing the login window.

Note that you can replace the text between the quotation marks with any message you want to display on the login window.

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