wordpress get user name from id code example

Example 1: wordpress get username

$current_user = wp_get_current_user();
echo($current_user->user_login);

Example 2: how to fetch all user data form user in wp

<?php
$users = get_users( array( 'fields' => array( 'ID' ) ) );
 foreach($users as $user){
	   echo"<pre>";
       print_r(get_user_meta ( $user->ID));
		echo"</pre>;
   }
add_shortcode('userget','getuser');
?>