A command-line interface or command language interpreter (CLI), also known as command-line user interface, console user interface, and character user interface (CUI), is a means of interacting with a computer program where the user (or client) issues commands to the program in the form of successive lines of text (command lines).
fortune is a simple program that displays a pseudorandom message from a database of quotations that first appeared in Version 7 Unix. The most common version on modern systems is …