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In the Terminal: sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "Your Message Here"

sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "Your Message Here"

In Terminal: sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "Your Message Here"

In the Terminal:

sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "Your Message Here"
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Mike Scott
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In Terminal: sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "Your Message Here"