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Subject: Re: Persistence of variables
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(defun write-string-to-file (string file)
  "Write STRING to FILE.
Create nonexistent FILE otherwise overwrite."
  (interactive "sstring: \nFfile: ")
  (with-temp-file file
    (insert string "\n") ))
;; (write-string-to-file "Leeloo Dallas Multipass" "~/5ifth.txt")

(require 'subr-x)
(defun file-to-string (file)
  "Put the contents of FILE into a string and return it."
  (interactive "Ffile: ")
  (with-temp-buffer
    (insert-file-contents file)
    (string-trim
     (buffer-substring-no-properties (point-min) (point-max)))
    ))
;; (file-to-string "~/5ifth.txt")

(defmacro read-from-file (var file)
  `(setq ,var ,(file-to-string file)) )

(defvar string-value)
(setq string-value "")

;; (read-from-file string-value "~/5ifth.txt")
;; string-value

-- 
underground experts united
http://user.it.uu.se/~embe8573