Which statement correctly describes Cron scheduling according to the material?

Which statement correctly describes Cron scheduling according to the material?

• A. Cron allows scheduling tasks to be executed every minute.
• B. Cron and Anacron have identical scheduling semantics.
• C. Anacron runs tasks only at system boot.
• D. Anacron cannot schedule tasks at a specific date.

Answer: (A)

Cron uses a calendar-based schedule defined in a crontab, where a line specifies minute, hour, day of month, month, and day of week, followed by the command. By setting the minute field to an asterisk, cron triggers the job every minute (assuming the other fields allow it), which is exactly what the statement describes. This shows cron’s ability to express fine-grained, recurring timing, including running tasks at every minute when configured that way. The other patterns don’t fit Cron’s behavior as described in the material: Anacron operates on intervals (daily, weekly, monthly) and is designed for systems that aren’t always on, rather than exact calendar-time scheduling; it isn’t limited to system boot, and cron’s semantics aren’t identical to Anacron. Hence, Cron’s capability to run a task every minute matches the described statement.

Cron uses a calendar-based schedule defined in a crontab, where a line specifies minute, hour, day of month, month, and day of week, followed by the command. By setting the minute field to an asterisk, cron triggers the job every minute (assuming the other fields allow it), which is exactly what the statement describes. This shows cron’s ability to express fine-grained, recurring timing, including running tasks at every minute when configured that way.

The other patterns don’t fit Cron’s behavior as described in the material: Anacron operates on intervals (daily, weekly, monthly) and is designed for systems that aren’t always on, rather than exact calendar-time scheduling; it isn’t limited to system boot, and cron’s semantics aren’t identical to Anacron. Hence, Cron’s capability to run a task every minute matches the described statement.