Variable: comint-input-history-ignore
comint-input-history-ignore is a variable defined in comint.el.gz.
Value
"^#"
Documentation
Regexp for history entries that should be ignored when Comint initializes.
Probably introduced at or before Emacs version 21.1.
Source Code
;; Defined in /usr/src/emacs/lisp/comint.el.gz
(defvar comint-input-history-ignore "^#"
"Regexp for history entries that should be ignored when Comint initializes.")