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Ubuntu - Cron - Delete Crontab

To terminate all pre-scheduled tasks, deleting the crontab for the currently logged in user.

crontab -r

Simply pass the -r (remove) flag to crontab for removing the crontab.

Delete the Crontab of a specific User

crontab -u User -r

The same can be done using the below command.

crontab -r User