What is the principle behind implementing scheduled tasks in Linux?

The implementation principle of Linux scheduled tasks is achieved through cron (Cron is a task scheduler for Unix and Unix-like operating systems).

Cron is a daemon that executes scheduled commands or scripts at specified times. It reads and interprets the system’s crontab file, which lists tasks and their corresponding execution times. Each user can create their own crontab file to define their own scheduled tasks.

Cron will periodically check the crontab file in the system. If any tasks need to be executed, Cron will run the corresponding command or script at the specified time.

Cron uses the system’s timer and time management functions to schedule tasks. It checks the current time against the scheduled time at specified intervals, and if they match, it executes the corresponding command or script.

With cron, various timed tasks can be implemented, such as backing up data or cleaning temporary files. It offers flexible configuration options to meet the needs of different users.