How to show custom message once on plugin activation?

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I know by watching the akismet plugin source how to show a custom message on the plugins page, but I want my message to appear only once after my plugin is activated.

How could i do this?

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  1. The easiest way would be to check for an stub get_option something like

    $run_once = get_option('run_once');

if (!$run_once){
    //show your custom message here
    // then update the option so this message won't show again
    update_option('run_once',true);
}

    hope this helps