How to modify the contents of all the alive buffers in emacs lisp?

The output of buffer-list is a list of buffer objects Functions dealing with a specific buffer will typically accept a buffer object as an argument: (buffer-name (car (buffer-list))) The syntax is explained here: M-: (info "(elisp) Printed Representation") RET I can't imagine why you'd want to modify all buffers (remember this includes the minibuffer, possibly some internal-use buffers, various others like *Help*, *Messages*, and maybe some read-only buffers), but you could use the following as the basis: (let ((buffers (buffer-list))) (while (car buffers) (set-buffer (car buffers)) (let ((contents (save-restriction (widen) (buffer-string)))) do something with contents ) (setq buffers (cdr buffers)))).

The output of buffer-list is a list of buffer objects. Functions dealing with a specific buffer will typically accept a buffer object as an argument: (buffer-name (car (buffer-list))) The # syntax is explained here: M-: (info "(elisp) Printed Representation") RET I can't imagine why you'd want to modify all buffers (remember this includes the minibuffer, possibly some internal-use buffers, various others like *Help*, *Messages*, and maybe some read-only buffers), but you could use the following as the basis: (let ((buffers (buffer-list))) (while (car buffers) (set-buffer (car buffers)) (let ((contents (save-restriction (widen) (buffer-string)))) do something with contents ) (setq buffers (cdr buffers)))).

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