In a terminal in cooked mode, Ctrl+D sends EOF. Literally any program that reads from stdin and doesn't do something special to avoid it will handle Ctrl+D. T

In a terminal in cooked mode, Ctrl+D sends EOF. Literally any program that reads from stdin and doesn't do something special to avoid it will handle Ctrl+D. That's the point about why it's worth it to learn: It's universal to all terminal programs, even if the author of the program didn't know about it.