TestCommand.php

<?php
namespace Test\Bundle\TestBundle\Command;

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

class TestCommand extends ContainerAwareCommand
{
    /**
     * configure
     *
     * @access protected
     * @return void
     */
    protected function configure()
    {
        $this->setName( 'test:content' )->setDefinition(
            array(
            )
        );
    }

    protected function setAdmin()
    {
        $repository = $this->getContainer()->get('ezpublish.api.repository');
        $repository->setCurrentUser($repository->getUserService()->loadUser(14));
    }

    protected function execute( InputInterface $input, OutputInterface $output )
    {
        $this->setAdmin();

        $this->container = $this->getContainer();
        $repo = $this->container->get('ezpublish.api.repository');

        $contentTypeService = $repo->getContentTypeService();
        $contentType = $contentTypeService->loadContentTypeByIdentifier('test');

        $fieldDefinition = $contentType->getFieldDefinition('body');
        $updateStruct = $contentTypeService->newFieldDefinitionUpdateStruct();
        $updateStruct->descriptions = array('eng-GB' => 'Body');

        $draft = $contentTypeService->createContentTypeDraft($contentType);

        try {
            $contentTypeService->updateFieldDefinition($draft,$fieldDefinition,$updateStruct);
            $contentTypeService->publishContentTypeDraft($draft);
        } catch (\Exception $e ) {
            var_dump( $e->getTraceAsString() );
            throw $e;
        }
    }
}