function manage_pages_columns($columns) {
$columns['slug'] = __('Slug');
return $columns;
}
function add_pages_column($column_name, $post_id) {
if ( 'slug' == $column_name) {
$post = get_post($post_id);
$slug = $post->post_name;
echo attribute_escape($slug);
}
}
add_filter( 'manage_pages_columns', 'manage_pages_columns' );
add_action( 'manage_pages_custom_column', 'add_pages_column', 10, 2 );