Functions.php: Exclude Category from “Blog”

http://codex.wordpress.org/Function_Reference/is_main_query

add_action( 'pre_get_posts', 'foo_modify_query_exclude_category' );
function foo_modify_query_exclude_category( $query ) {
    if ( $query->is_main_query() && ! $query->get( 'cat' ) )
        $query->set( 'cat', '-5' );
}

So it’s quite obvious to how exclude certain categories from within a
template, …

Actually it’s not. Are you talking about query_posts() !?

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