wds-hello-world.php

<?php
/*
Plugin Name: WDS Hello World
Plugin URI: https://webdevstudios.com/
Description: Teaching the basics of WP-CLI
Author: Web Dev Studios
Version: 1.0.0
Author URI: https://webdevstudios.com/
*/

class WDS_CLI {

	/**
	 * Returns 'Hello World'
	 *
	 * @since  0.0.1
	 * @author Scott Anderson
	 */
	public function hello_world() {
		WP_CLI::line( 'Hello World!' );
	}

}

/**
 * Registers our command when cli get's initialized.
 *
 * @since  1.0.0
 * @author Scott Anderson
 */
function wds_cli_register_commands() {
	WP_CLI::add_command( 'wds', 'WDS_CLI' );
}

add_action( 'cli_init', 'wds_cli_register_commands' );