*/1 * * * *  echo "1 $(date +'%Y-%m-%d %T')"
*/2 * ? * ?  * echo "2 $(date +'%Y-%m-%d %T')"
*/3 * ? * ? 0 2000-2024/4 echo "3 $(date +'%Y-%m-%d %T')"
*/4 * ? * ?  0 2023 echo "4 $(date +'%Y-%m-%d %T')"
*/5 * ? * ?	  *   2020-2030 echo "5 $(date +'%Y-%m-%d %T')"
*/6 * ? * ?	1,2 echo "6 $(date +'%Y-%m-%d %T')"
*/7 * ? * ?  1#4   2003,2005 echo "7 $(date +'%Y-%m-%d %T')"
*/8 * ? * ? 2-7/3 echo "8 $(date +'%Y-%m-%d %T')"
*/9 * ? * ?  1-6 */5 echo "9 $(date +'%Y-%m-%d %T')"
*/10 * ? * ?   sun-mon * echo "10 $(date +'%Y-%m-%d %T')"
*/11 * ? * ?   sun 2020 echo "11 $(date +'%Y-%m-%d %T')"
*/12 * ? * ?   mon echo "12 $(date +'%Y-%m-%d %T')"
*/13 * ? * ?  1#4  echo "13 $(date +'%Y-%m-%d %T')"