Question

I have execute-extended-command bound to alt+a. So when in minibuffer, when i press it, the read-only prompt saying “M-x” is irrelevant for me. I want to change it to something else like “execute command:”. How can i do that?

Answer 1

This prompt is hard-coded. You would need to either redefine read-extended-command, or advise completing-read (but that seems a fairly tenuous approach).

See M-x find-function RET read-extended-command RET

There are comments in the code referring to this very issue:

;; This isn't strictly correct if `execute-extended-command'
;; is bound to anything else (e.g. [menu]).
;; It could use (key-description (this-single-command-keys)),
;; but actually a prompt other than "M-x" would be confusing,
;; because "M-x" is a well-known prompt to read a command
;; and it serves as a shorthand for "Extended command: ".

Honestly, given the lack of a clean solution, I wouldn’t bother trying to do this.