message function will show the user a small message
(typically no more than a single column of text). In graphical
applications it won’t bring up a separate window, only
displaying the text in a status bar or something similar. In a
console-based environment, the message will be printed to the
stderr stream, followed by a line break.
Displays a one-line message, the string message. If display-now, every effort will be made to display the message as soon as possible, possibly before the next scheduled screen update (if applicable).
This function is exported by the