org-babel-tangle-file
org-babel-tangle-file is an interactive autoloaded compiled Lisp function in `ob-tangle.el
'.
(org-babel-tangle-file FILE &optional TARGET-FILE LANG)
Extract the bodies of source code blocks in FILE.
Source code blocks are extracted with `org-babel-tangle'.
Optional argument TARGET-FILE can be used to specify a default
export file for all source blocks. Optional argument LANG can be
used to limit the exported source code blocks by language.
Return a list whose CAR is the tangled file name.