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When I add some lisp program in the init.el. I don't want to restart emacs in order to make effect. Then how can I do that?

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In addition to Drew's answer, if you add more than one expression, and don't want to have to evaluate them all individually, there's eval-region. Its docstring:

Execute the region as Lisp code.

Select the region (move point to before the first expression, press C-space, move point to after the expression), then run M-x eval-region.

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Evaluate it: call it with its arguments, using, for example C-x C-e. If the function foo takes arguments arg1 and arg2, type (foo arg1 arg2), put the cursor after ), and hit C-x C-e.

But if you are going to use some Emacs Lisp you really should start to read the Intro to Emacs Lisp manual - use C-h i then choose Emacs Lisp Intro.

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If your function has defvar or defcustom and you want those reset as part of the eval, then consider C-M-x (eval-defun). A plain eval will not reset previous values of the defvars, if any.

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