Revised Commands -> use symfony/console -> php ma (MyAAC)

Usage:
php ma list
php ma cache:clear
php ma plugin:install guild-wars.zip

More sophisticated:
echo "Hello, this is hello world message" | php ma mail:send test@test.com --subject "This is subject"

Also: custom commands can be added via Plugins: just need to return new class instance that extends \MyAAC\Commands\Command in plugins/*/commands folder

system/src/Commands/CronjobInstallCommand.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace MyAAC\Commands;
+
+use GO\Scheduler;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+class CronjobInstallCommand extends Command
+{
+	protected function configure(): void
+	{
+		$this->setName('cronjob:install')
+			->setDescription('This command automatically registers into your crontab');
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int
+	{
+		$io = new SymfonyStyle($input, $output);
+
+		if (MYAAC_OS !== 'LINUX') {
+			$io->error('This script can be run only on linux.');
+			return 2;
+		}
+
+		$job = '* * * * * /usr/bin/php ' . SYSTEM . 'bin/cronjob.php >> ' . SYSTEM . 'logs/cron.log 2>&1';
+
+		if ($this->cronjobExists($job)) {
+			$io->info('MyAAC cronjob already installed.');
+			return Command::FAILURE;
+		}
+
+		exec('crontab -l', $content);
+
+		$content = implode(' ', $content);
+		$content .= PHP_EOL . $job;
+
+		file_put_contents(CACHE . 'cronjob', $content . PHP_EOL);
+		exec('crontab ' . CACHE. 'cronjob');
+
+		$io->success('Installed crontab successfully.');
+		return Command::SUCCESS;
+	}
+
+	private function cronjobExists($command): bool
+	{
+		exec('crontab -l', $crontab);
+
+		if(isset($crontab) && is_array($crontab)) {
+			$crontab = array_flip($crontab);
+
+			if(isset($crontab[$command])){
+				return true;
+			}
+		}
+
+		return false;
+	}
+}