defcustom: store variable value permanently

Question

When I have a custom variable and a function that changes it's value:

(defcustom current-fileset nil "Currently selected fileset" :type 'string)

(defun set-val ()
  (setq current-fileset "value")
  )

and call (set-val), the value of current-fileset is change until I restart Emacs. How can I store the value permanently?

Answer 1

This saves the new value to your init files.

(customize-save-variable
 'current-fileset "newvalue")

Or

You can copy this to your init file directly

(custom-set-variables
 '(current-fileset "newvalue"))

... and restart Emacs.