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efaq: Evaluating Emacs Lisp code

 
 5.31 How do I execute (“evaluate”) a piece of Emacs Lisp code?
 ==============================================================
 
 There are a number of ways to execute (“evaluate”, in Lisp lingo) an
 Emacs Lisp “form”:
 
    • If you want it evaluated every time you run Emacs, put it in a file
      named ‘.emacs’ in your home directory.  This is known as “your
      ‘.emacs’ file,” and contains all of your personal customizations.
 
    • You can type the form in the ‘*scratch*’ buffer, and then type
      <LFD> (or ‘C-j’) after it.  The result of evaluating the form will
      be inserted in the buffer.
 
    • In ‘emacs-lisp-mode’, typing ‘C-M-x’ evaluates a top-level form
      before or around point.
 
    • Typing ‘C-x C-e’ in any buffer evaluates the Lisp form immediately
      before point and prints its value in the echo area.
 
    • Typing ‘M-:’ or ‘M-x eval-expression’ allows you to type a Lisp
      form in the minibuffer which will be evaluated once you press
      <RET>.
 
    • You can use ‘M-x load-file’ to have Emacs evaluate all the Lisp
      forms in a file.  (To do this from Lisp use the function ‘load’
      instead.)
 
      The functions ‘load-library’, ‘eval-region’, ‘eval-buffer’,
      ‘require’, and ‘autoload’ are also useful; see Emacs Lisp
      documentation, if you want to learn more about them.
 

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