Variable: comint-input-ring-separator
comint-input-ring-separator is a variable defined in comint.el.gz.
Value
"\n"
Documentation
Separator between commands in the history file.
Source Code
;; Defined in /usr/src/emacs/lisp/comint.el.gz
(defvar comint-input-ring-separator "\n"
"Separator between commands in the history file.")