Emacs: what is the shortcut key to clear buffer?

Like, Control-A (select all开发者_Python百科) followed by delete?

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How about using:

M-x erase-buffer

Which you could bind to whatever you want.

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C-x h + del key clears the buffer

Note: This requires transient-mark-mode to be enabled (which it is by default).

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Select all in Emacs is:

C-x h

(technically, that's mark-whole-buffer) and kill-region (to kill the marked region, which is now the entire buffer) is:

C-w

If you want to delete the region without copying it to the kill-ring, you can use

M-x delete-region

instead. If you do this alot, you'll want to bind delete-region to a key/key combo.

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These macros build on the answers given above. To start using them paste them into your .emacs then restart emacs or (while in the .emacs buffer) type M-x eval-buffer.

(defun clear-buffer ()
  "clear whole buffer add contents to the kill ring"
  (interactive)
  (kill-region (point-min) (point-max))
  )

(defun clear-buffer-permenantly ()
  "clear whole buffer, contents is not added to the kill ring"
  (interactive)
  (delete-region (point-min) (point-max))
  )

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Old folks might like to call it hk rather than clear-buffer-permanently, and assign it to the nostalgic key sequence like so:

(define-key esc-map "\^[hk" 'hk)

That's the pre-Gnu TECO EMACS command to clear the buffer (ESC ESC wHole Kill).

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Go to the begin of the buffer, go to the end (both set the mark), then cut:

M-< M-> C-w

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There is no shortcut, but you can define one... Follow this link to get a macro for clearing a buffer.