The cron daemon is a long-running process that executes commands at specific dates and times. You can use this to schedule activities, either as one-time events or as recurring tasks. And Crontab (CRON TABle) is a file which contains the schedule of cron entries to be run and at specified times. Now the question is, how do I find the crontab file in my Linux system?  I searched for it in Google but this simple question wasn't answered simply at all. So I had to come out with an easy solution for Fedora and CentOS users.

Open your terminal window and type

cd /var/spool/cron/

For example: for root user the file is -  /var/spool/cron/root.

Suppose you are another user who has permission to access the directory and write, just type

crontab -e

Even if you don't have a crontab file for your name, it will create one according as your user account and you can edit it later.

You can read this article for further knowlege regarding crontab