(defun my-eshell-kill-line0 ()
   "カーソル位置からプロンプトまでを削除"
   (interactive)
   (save-restriction
     (narrow-to-region (point) (eshell-bol))
     (kill-line 1)))

 (add-hook 'eshell-mode-hook
   (lambda()
     (define-key eshell-mode-map (kbd "C-c k") 'my-eshell-kill-line0)))