ConfigOverrideCommand.php

<?php
/**
 * @file
 * Contains \Drupal\AppConsole\Command\ConfigOverrideCommand.
 */
namespace Drupal\AppConsole\Command;

use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class ConfigOverrideCommand extends ContainerAwareCommand
{
    protected function configure()
    {
        $this
          ->setName('config:override')
          ->setDescription($this->trans('commands.config.override.description'))
          ->addArgument('config-name', InputArgument::REQUIRED,
            $this->trans('commands.config.override.arguments.config-name'))
          ->addArgument('key', InputArgument::REQUIRED, $this->trans('commands.config.override.arguments.key'))
          ->addArgument('value', InputArgument::REQUIRED, $this->trans('commands.config.override.arguments.value'));
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $table = $this->getHelperSet()->get('table');
        $configName = $input->getArgument('config-name');
        $key = $input->getArgument('key');
        $value = $input->getArgument('value');

        $config = $this->getConfigFactory()->getEditable($configName);

        $configurationOverrideResult = $this->overrideConfiguration($config, $key, $value);

        $config->save();

        $output->writeln(sprintf(
          ' <info>%s:</info> <comment>%s</comment>',
          $this->trans('commands.config.override.messages.configuration'),
          $configName
        ));

        $table->setHeaders(
          [
            $this->trans('commands.config.override.messages.configuration-key'),
            $this->trans('commands.config.override.messages.original'),
            $this->trans('commands.config.override.messages.updated'),
          ]);
        $table->setlayout($table::LAYOUT_COMPACT);
        $table->setRows($configurationOverrideResult);
        $table->render($output);

        $config->save();
    }

    protected function overrideConfiguration($config, $key, $value)
    {
        $result[] = [
          'configuration' => $key,
          'original' => $config->get($key),
          'updated' => $value,
        ];
        $config->set($key, $value);

        return $result;
    }
}