#+AUTHOR:

#+OPTIONS: toc:nil

#+PROPERTY: header-args:emacs-lisp :var tar-file="bar.tar.gz" :exports none

#+NAME: tar-eg

#+BEGIN_SRC emacs-lisp

  (let ((contents (format "> tar xzvf %s" tar-file)))

    (with-temp-buffer

      (insert contents)

      (write-file "results.txt"))

    contents)

#+END_SRC

#+CALL: tar-eg() :wrap example :exports results