Disable single post page

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Is there a way to disable single post page, for example when some tries to go to single post page to show 404 page.

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  1. Although I’m also curious as to why you’d want to do this, and would probably suggest using a custom post type instead, this would probably work (actually works for any single post type except pages and attachments):

    add_action( 'pre_get_posts', 'wpse44983_single_post_404' );
function wpse44983_single_post_404( $query ) {
    if ( $query->is_main_query() && $query->is_single() ) {
        $query->is_404 = true;
     }
}