How do you define print?

Question

Print in most languages is what appears to be a predefined function, but without the pre-existing ability to to post stuff on the command line, how do you define a function that can do so? I would guess there is some kind of API to interface with for it,but its not the sort of thing that you ever see done.

Answer 1

I would guess its something you have to define in the early stages of building a language, and there you show it how by referring the print command to another language or assembly code that knows how to do it already,and you bake that into your compiler/interpreter, does anyone have any further useful info on this? As I would be very interested, currently learning how to build languages.