old_contents: from crontab import *
  from ee.core.shellexec import EEShellExec
  from ee.core.logging import Log
  
  """
  Set CRON on LINUX system.
  https://pypi.python.org/pypi/python-crontab
  """
  
  class EECron():
      def setcron_daily(self,cmd,comment='Cron set by EasyEngine',user='root',min=0,hour=12):
          if not EEShellExec.cmd_exec(self, "crontab -l | grep -q \'{0}\'".format(cmd)):
              tab = CronTab(user=user)
              cron_job = tab.new(cmd, comment=comment)
              cron_job.minute.on(min)
              cron_job.hour.on(hour)
              #writes to crontab
              tab.write()
              Log.debug(self, "Cron is set:\n" + tab.render())
          else:
              Log.debug(self, "Cron already exist")
  
  
      def remove_cron(self,cmd):
          if EEShellExec.cmd_exec(self, "crontab -l | grep -q \'{0}\'".format(cmd)):
      #root@e:~# crontab -l | sed '/ee site update example.com --le/d' | crontab -
              if not EEShellExec.cmd_exec(self, "/bin/bash -c "
                                                      "\"crontab "
                                                      "-l | sed '/{0}/d'"
                                                      "| crontab -\""
                                                      .format(cmd)):
                  Log.error(self, "Failed to remove crontab entry",False)
          else:
              Log.debug(self, "Cron not found")
  
new_contents: from crontab import *
  from ee.core.shellexec import EEShellExec
  from ee.core.logging import Log
  
  """
  Set CRON on LINUX system.
  """
  
  class EECron():
      def setcron_daily(self,cmd,comment='Cron set by EasyEngine',user='root',min=0,hour=12):
          if not EEShellExec.cmd_exec(self, "crontab -l | grep -q \'{0}\'".format(cmd)):
              #0 12 * * * ee site update phpbreddddcamp.net --le=renew --min_expiry_limit 30 2> /dev/null # Renew letsencrypt SSL cert. Set by EasyEngine
  
              EEShellExec.cmd_exec(self, "/bin/bash -c \"crontab -l "
                                               "2> /dev/null | {{ cat; echo -e"
                                               " \\\""
                                               "\\n*/0 12 * * * "
                                               "{0}".format(cmd) +
                                               " # {0}".format(comment)+
                                               "\\\"; }} | crontab -\"")
              Log.debug(self, "Cron set")
  
  
  
      def remove_cron(self,cmd):
          if EEShellExec.cmd_exec(self, "crontab -l | grep -q \'{0}\'".format(cmd)):
      #root@e:~# crontab -l | sed '/ee site update example.com --le/d' | crontab -
              if not EEShellExec.cmd_exec(self, "/bin/bash -c "
                                                      "\"crontab "
                                                      "-l | sed '/{0}/d'"
                                                      "| crontab -\""
                                                      .format(cmd)):
                  Log.error(self, "Failed to remove crontab entry",False)
          else:
              Log.debug(self, "Cron not found")
  
subject: fix python-crontab issue