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I'm going through the documentation for the interactive function and there are some code letters which are documented like this:

d -- Value of point as number.  Does not do I/O.
P -- Prefix arg in raw form.  Does not do I/O.

My question is what does it mean when it mentions "Does not do I/O" ? We have the function recompile which uses (interactive "P"). The recompile function also uses the variable compile-command whose default value is this:

(defcustom compile-command (purecopy "make -k ")

Now I believe executing make command is actually a form of I/O as it involves spawning new process, possibly creating object files. But probably I'm mis-understanding how it's used in the context of Emacs.

1 Answer 1

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It just means that it doesn’t prompt the user for any information.

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