comint-bol is an interactive compiled Lisp function in `comint.el'.

(comint-bol &optional ARG)

Go to the beginning of line, then skip past the prompt, if any.
If prefix argument is given (C-u) the prompt is not skipped.
If `comint-use-prompt-regexp' is non-nil, then the prompt skip is done
by skipping text matching the regular expression `comint-prompt-regexp',
a buffer local variable.