Create shortcode with parameter wordpress

Here is the code

First step create shortcode function

function portfolio() {
 return get_home_url();
}
add_shortcode('portfolio', 'portfolio');

Create parameter

function portfolio($atts) {
 $attributes = shortcode_atts( array(
        'perpage' => -1 
    ), $atts );
 return $attributes ['perpage']; 
}
add_shortcode('portfolio', 'portfolio');

 Usage

[portfolio perpage='10']