Run Magento 2 code in console

run-script.php

#!/usr/bin/env php
<?php

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Application;

if (PHP_SAPI !== 'cli') {
    echo 'dev/run-script.php must be run as a CLI application';
    exit(1);
}

try {
    require __DIR__ . '/../app/bootstrap.php';
} catch (\Exception $e) {
    echo 'Autoload error: ' . $e->getMessage();
    exit(1);
}

class RunScriptCommand extends Command
{
    /** @var \Magento\Framework\DB\Adapter\Pdo\Mysql */
    protected $connection;

    protected function configure()
    {
        $bootstrap = \Magento\Framework\App\Bootstrap::create(BP, []);
        $objectManager = $bootstrap->getObjectManager();

        $this->connection = $objectManager->get('Magento\Framework\App\ResourceConnection')
                                          ->getConnection();
        $this
            ->setName('dev:run-script')
            ->setDescription('Run script');
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $output->writeln("Run script");

        // Run sql queries
        //$rows = $this->connection->fetchAll($sql);
        
        // Load order
        //$order = $this->objectManager->create('Magento\Sales\Model\Order');
        //$order->loadByIncrementId($orderNumber);
    }
}

try {
    $handler = new \Magento\Framework\App\ErrorHandler();
    set_error_handler([$handler, 'handler']);
    $application = new Application();
    $application->add(new RunScriptCommand());
    $application->run();

} catch (\Exception $e) {
    while ($e) {
        echo $e->getMessage();
        echo $e->getTraceAsString();
        echo "\n\n";
        $e = $e->getPrevious();
    }
    exit(\Magento\Framework\Console\Cli::RETURN_FAILURE);
}