function f_cron {
  echo "[$SCRIPT_COUNT] /etc/cron and /etc/at"

  rm /etc/cron.deny 2> /dev/null
  rm /etc/at.deny 2> /dev/null

  echo 'root' > /etc/cron.allow
  echo 'root' > /etc/at.allow

  chown root:root /etc/cron*
  chmod og-rwx /etc/cron*

  chown root:root /etc/at*
  chmod og-rwx /etc/at*

  systemctl mask atd.service
  systemctl stop atd.service
  systemctl daemon-reload

  sed -i 's/^#cron./cron./' /etc/rsyslog.d/50-default.conf

  if [[ $VERBOSE == "Y" ]]; then
    systemctl status atd.service --no-pager
    echo
  fi

  ((SCRIPT_COUNT++))
}