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From: Oscar Fuentes <ofv@wanadoo.es>
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Subject: Re: Clearing eshell screen
Date: 25 Oct 2002 01:59:17 +0200
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Oscar Fuentes <ofv@wanadoo.es> writes:

[snip]
> For me (Emacs 21.1.1 on Win2k and Linux) eshell doesn't
> honor the eshell-buffer-maximum-lines variable either
[snip]

Ooops! As the documentation says, adding 'eshell-truncate-buffer' to
'eshell-output-filter-functions' does the trick. Sorry.

Maybe this modification of 'eshell-truncate-buffer' is useful for the
OP:

(defun eshell-clears-buffer ()
  "Deletes the contents of eshell buffer, except the last prompt"
  (interactive)
  (save-excursion
    (goto-char eshell-last-output-end)
    (let ((lines (count-lines 1 (point)))
	  (inhibit-read-only t))
      (beginning-of-line)
      (let ((pos (point)))
	(if (bobp)
	    (if (interactive-p)
		(error "Buffer too short to truncate"))
	  (delete-region (point-min) (point))
	  (if (interactive-p)
	      (message "Buffer cleared")))))))

-- 
Oscar