I want to be able to create some mock-up sketches for a command line program so I can visually display some new changes to a command line program and what the command line UI would look like but I don't know how I could create them. This is so that I can visually plan/show what my changes would look like in a command line prompt box (the picture below is just a bare bones start of what I would want to be able to sketch in a program before moving onto other more complex sketches) before I start coding/implementing.
I would want to display what new commands I would add to a help section (so like a list of commands). Additionally I would want to display line by line some new features such as an user authentication prompt followed by a space to input a username/password.
I thought about trying to use command line itself to display these planned changes but I don't know how I would go about this (i.e. without coding anything yet). I also thought about using Photoshop but I want to see if that is recommended for this kind of thing or something else is better before I go and get it/learn how to use it.
I see a lot of things out there for sketching mock up website and app designs but nothing dedicated for command line so any recommendations or advice are welcome!