The difference between a Command-Line Interface (argv-based) and a Textual User Interface (e.g. ncurses or fdisk-style interactive) is very important; the latter generally just means "a very bad but low-bandwidth GUI with no mouse support", but the former implies several attributes that allow for automation and programability: the course of interaction with a program (its command-line invocation) becomes an object trivially manipulable in its own right by users and programs.

We need to improve from the command-line by enabling even more expressive operations on programs invocations: programs should cooperate to enable perfect completion in a way that doesn't require writing custom completion scripts for every (shell, tool) combination, and they could describe their input and output formats to allow the shell to do "program search" in the space of command-lines. Given fairly rough user input, the shell can help guide the user to where they were trying to go with less work. Computers should be using some CPU time to actually help us figure out what we're trying to do, instead of everyone still hunting down syntax errors and reading man pages like it's the 1980's.