code: def add_cron(self, name, command, minute="*", hour="*", mday="*", month="*", wday="*", who="root", env=None):
          
          if minute == 'random':
              minute = str(random.randrange(60))
          if hour == 'random':
              hour = str(random.randrange(24))
          fp = open('/etc/cron.d/%s' % name, "w")
          if env:
              for key, value in env.items():
                  fp.write('%s=%s\n' % (key, value))
          fp.write('%s %s %s %s %s %s %s\n' % (minute, hour, mday, month, wday, who, command))
          fp.close()
docs: Write a file to /etc/cron.d to schedule a command
              env is a dict containing environment variables you want to set in the file
              name will be used as the name of the file