wenpai.org/wp-content/mu-plugins/vendor/wp-cli/shell-command/shell-command.php

<?php

if ( ! class_exists( 'WP_CLI' ) ) {
	return;
}

$wpcli_shell_autoloader = __DIR__ . '/vendor/autoload.php';
if ( file_exists( $wpcli_shell_autoloader ) ) {
	require_once $wpcli_shell_autoloader;
}

WP_CLI::add_command( 'shell', 'Shell_Command' );