Trigger Notification Center Message using Mac Terminal Command

If you have a use case where you want to trigger a Notification Alert on your Mac using the terminal, you can do that using the osascript display notification command,

osascript -e 'display notification "Message!" with title "Title"'

You can also add subtitle to the notification using subtitle, example,

% osascript -e '
display notification "This is a test message!" 
with title "This is test Title" 
subtitle "This is subtitle"'