CLIs work well when the universe of commands is small or the user is very familiar with the application. Discoverability suffers, even with man pages. Where a G

CLIs work well when the universe of commands is small or the user is very familiar with the application. Discoverability suffers, even with man pages. Where a GUI helps is for the casual user who needs help understanding the options. An interface that can allow both styles of interaction has the flexibility to give both kinds of users what they need.