Which command allows a user to run tasks regularly at specific intervals in a Linux environment?

The command that allows a user to run tasks regularly at specific intervals in a Linux environment is cron. Cron is a time-based job scheduler in Unix-like operating systems that enables users to schedule scripts or commands to be executed automatically at specified times and dates. The scheduling is configured using a crontab file, where the user can define when and how often a task should run, such as daily, weekly, or at custom intervals.

Using cron is particularly useful for automated maintenance tasks, backups, or any repetitive job that needs to run consistently without requiring manual intervention. The flexibility of cron allows for the specification of exact minute, hour, day of the month, month, and day of the week when a task should be executed.

In contrast, the at command is designed for one-time execution of tasks rather than regular scheduling. The repeat and time commands do not exist as standard commands for scheduling tasks in Linux. Therefore, cron stands out as the appropriate choice for running tasks regularly at specific intervals.