The following works in El Capitan, so I assume it will work in Sierra as well.
To add a message to your logon screen, do the following:
1. Launch Terminal app from the /Applications/Utilities folder.
2. Type the following in the Terminal:
sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "Hey Bill . . . You are one cool dude for your age."
3. Hit your "return" key.
4. Provide your admin password when requested to do so.
5. Log out of your account, and then back in again.
6. Enjoy!
To remove the message, type the following. It is the same as the previous one, except there is nothing beween the quotes:
sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText ""
Or to change the message to something else, just type something new between the quotes, and repeat steps 3 through 6.
To add a message to your logon screen, do the following:
1. Launch Terminal app from the /Applications/Utilities folder.
2. Type the following in the Terminal:
sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "Hey Bill . . . You are one cool dude for your age."
3. Hit your "return" key.
4. Provide your admin password when requested to do so.
5. Log out of your account, and then back in again.
6. Enjoy!
To remove the message, type the following. It is the same as the previous one, except there is nothing beween the quotes:
sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText ""
Or to change the message to something else, just type something new between the quotes, and repeat steps 3 through 6.
