The 'at' command is indeed used for one-time task scheduling on Linux systems. It does not provide a way to schedule recurring jobs; that functionality is handled by 'cron'. Therefore, 'at' is suitable for tasks that need to be run once at a certain point in time in the future.
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What is the difference between 'at' and 'cron' commands?
How do you use the 'at' command to schedule a task?
What types of tasks can be scheduled with the 'at' command?