Cron job text fro crontab?

I need to add command to the crontab. It was never done. But, I an not sure where to find the command to add. I am sure it is available on my installation somewhere.

Then, what is the command that pulls up the file to which I add the command?

Special instructions to follow when adding it?

Thanks

Please navigate to Admin -> Schedulers . There you will find instructions on how to add the cron and the command to add it as per your instance.