A cron job is a task scheduled to run automatically at specified times or dates, defined using a specific syntax. The task is executed by the cron daemon, which runs in the background. The syntax used to specify a cron job consists of 5 fields: minute (0-59), hour (0-23), day of the month (1-31), month (1-12), and day of the week (0-7, with both 0 and 7 representing Sunday). By combining these fields, a user can specify when and how often a particular task or script should run. Cron jobs are commonly used for system maintenance, log rotation, database backup, and other tasks that need to be executed regularly.
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