'Return the command line for writing a crontab'

def _write_execute(self, path):

    user = ''
    if self.user:
        if (platform.system() in ['SunOS', 'HP-UX', 'AIX']):
            return ("chown    %s    %s    ;    su    '%s'    -c    '%s    %s'" % (pipes.quote(self.user), pipes.quote(path), pipes.quote(self.user), CRONCMD, pipes.quote(path)))
        else:
            user = ('-u    %s' % pipes.quote(self.user))
    return ('%s    %s    %s' % (CRONCMD, user, pipes.quote(path)))
