crontab Syntax:
================
MIN HOUR DOM MON DOW CMD

Crontab Fields and Allowed Ranges:
===================================
Field	Description		Allowed Value
-----	-----------		-------------
MIN		Minute field	0 to 59
HOUR	Hour field		0 to 23
DOM		Day of Month	1-31
MON		Month field		1-12
DOW		Day Of Week		0-6
CMD		Command	Any command to be executed.


Example:
========
30 11 * * * /tmp/Crontab.sh
This command will execute every day at 11.30



use crontab to schedule the following shell

Edit the crontab jobs by using below command

crontab -e

and update path and the expected time to schedule the job
  
30 23 * * * /<path>/run_aggregation.sh