Simple generic command line script for WordPress

wp-command-line-script.php

<?php

// Let's load WordPress
require( 'wp-load.php' );

if ( ! function_exists( 'wp' ) )
	die( 'Sorry, looks like WordPress isn\'t loaded.' );

// Run the core code for our script
my_command_line_script();

function my_command_line_script() {
	
	// We're going to run through batches of 50 posts at a time
	$posts_per_page = 50;
	
	// Set up the main query args
	$args = array(
		
		'posts_per_page' => $posts_per_page,
		'offset' => 0,
	);
	
	// Let's get our first batch
	$query = new WP_Query( $args );
	
	// Now let's loop through out posts until we've gone through all of them
	while ( $query->have_posts() ) {
		$query->the_post();
		
		// Our main script actions would go here...
		
		// Let's get the next batch
		$args['offset'] += $posts_per_page;
		$query = new WP_Query( $args );
	}
}

hello,
how can I execute this script via command line ?