LoadFixturesCommand.php

<?php
namespace Acme\DemoBundle\Command;

use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

class ImportCSVCommand extends ContainerAwareCommand
{
    protected function configure()
    {
        $this
            ->setName('demo:load-fixtures')
            ->setDescription('Import CSV into database')
            ->addArgument(
                'filename',
                InputArgument::OPTIONAL,
                'What file do you want to import?',
                __DIR__.'/../../../app/Resources/fixtures.csv'
            )
        ;
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $filename = $input->getArgument('filename');
        $output->writeln(sprintf('<info>Parsing %s</info>',$filename));

        if (!is_file($filename)) {
            $output->writeln('<error>No such file!</error>');
            return;
        }

        $loader = $this->container->get('fixture_loader');
        $loader->load($filename);
    }
}