Question

I would like to copy an entire line from buffer A -to-> buffer B.

The same way you would do it in an Ediff session.
That you just press A or B and the entireline is copied.

However I’m not in an ediff because both files are different.

Is there a fast way to do it?

Or will a keyboard macro be the best option??

Answer 1

A keyboard macro is definitely the best option here unless you’re interested in learning emacs-lisp.

Here is C-h l lossage from recording this macro

C-x ( C-a C-SPC C-n M-w C-x o C-a C-y C-u – 1 C-x o C-x )

Here is the macro dumped as text (edit-last-kbd-macro)

;; Keyboard Macro Editor.  Press C-c C-c to finish; press C-x k RET to cancel.
;; Original keys: C-a C-SPC C-n M-w C-x o C-a C-y C-u -1 C-x o

Command: last-kbd-macro
Key: none

Macro:

C-a         ;; le::beginning-of-line
C-SPC           ;; set-mark-command
C-n         ;; next-line
M-w         ;; le::kill-ring-save
C-x o           ;; other-window
C-a         ;; le::beginning-of-line
C-y         ;; yank
C-u -1 C-x o        ;; other-window

Here is the code to bind the macro to a key in your init file:

(global-set-key (kbd "C-c c") [?\C-a ?\C-  ?\C-n ?\M-w ?\C-x ?o ?\C-a ?\C-y ?\C-u ?- ?1 ?\C-x ?o])