/**
* Reads content from system crontab of the current user.
* @throws AccessDeniedException if access to crontab is denied.
* @return string
*/
public function read()
{
$result = $this->shell->execute($this->getCronCommand() . ' -l');
if ($this->shell->isFailed()) {
throw new AccessDeniedException($result, $this->shell->getErrorCode());
}
return $this->shell->getOutput();
}
