How can i open and write in cron file task using symfony2

Question

I'm creating an application in Symfony2.4. I also have the command, I want to add the command in cron a task using symfony2, not manually namely, the via symfony2, open and write. Any suggestions to get this done.

Answer 1

faost thanks. but I know how to add in cron manually via the console, I was interested how it do through the controller. In short, I found the solution :)

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$output = shell_exec('crontab -l');
file_put_contents('/crontab.txt', $output.'* * * * * command'.PHP_EOL, FILE_APPEND | LOCK_EX);
echo exec('crontab /crontab.txt');