XFCE taking the picture
XFCE taking the picture
CUI was me messing up. I meant TUI (text user interface).
The command line interface (CLI) is the original TUI and is always prompt and response. You’re prompted for a command, you type it in and then the computer spits out the answer below.
The original CLI were printed on a teletype machine before there were videoterminals. So if your TUI has a real typewriter-kind-of-experience, that’s a CLI. So even something like cowsay is CLI.
TUI is a more broadly encompassing term. This includes CLI, but also programs that display text or text like lines all over the screen. The popular library ncurses is generally used to make these programs. Popular examples would be vim, or emacs, or htop, things like that.
A very simple example of a TUI program is less. It lets you pipe output of a TUI command into it so that it can be scrolled without using only the screen buffer.