LFCS Question #521: Real Exam Question with Answer & Explanation

Question

Which of the following is the main difference between the batch and at commands?

Options

• AThe batch command will run multiple times.
• BThe batch command will run when system load is low.
• CThe at command reads commands from standard input.
• DThe at command emails results to the user.

Explanation

The main difference between batch and at commands is that batch runs jobs when the system load is low, while at runs jobs at a specific time regardless of load.

Common mistakes.

• A. Both batch and at commands typically schedule a job for a single execution at a specified time or condition, not multiple times unless explicitly rescheduled.
• C. Both the at and batch commands, by default, read the commands to be executed from standard input.
• D. Both at and batch commands are configured to email the standard output and standard error of the executed commands to the user who submitted them, provided the mail system is properly set up.

Concept tested. Linux job scheduling (at vs. batch)

Reference. https://man7.org/linux/man-pages/man1/at.1.html

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