at

The 'at' command is a Unix/Linux utility for scheduling one-time tasks to run at a specified future time. It allows users to queue commands or scripts for execution without requiring continuous monitoring, using a simple time specification format. It is commonly used for automating administrative tasks, backups, or reminders on systems.

Also known as: at command, at utility, atd, at daemon, atq

Why learn at?

Developers should learn 'at' for automating one-off tasks in Unix-like environments, such as scheduling system maintenance, running scripts after hours, or setting up delayed notifications. It is particularly useful in scenarios where cron (for recurring jobs) is overkill, and immediate execution is not required, offering a lightweight alternative for time-based job scheduling.

Learning Resources

• tutorial: Linux at Command Tutorial
• docs: at man page
• tutorial: How to Use at Command in Linux
• tutorial: Linux at Command Examples