Removing an at job by ID | LinuC Level 1 102 Exam original practice question

1.08.2Basic

Delete pending at job ID 12 before it runs.

Which command is appropriate?

Hint 1: Focus on the scheduling model

Separate recurring schedules, one-time jobs, access-control files, and catch-up behavior before comparing the commands or settings.

Hint 2: Key terms

Review the short definitions of recurring schedules, one-time jobs, access-control files, and catch-up behavior involved.

atrm: Removes a pending at job identified by its numeric job ID.
Job ID: The identifier assigned to a queued at job for later inspection or removal.
atq: Lists pending at jobs and their identifiers.
Cron table: The recurring schedule managed by crontab, distinct from the at queue.

Detailed explanation

Incorrectat -r 12

Incorrect. The standard deletion command is atrm.

Incorrectatq 12

Incorrect. atq lists jobs without deleting them.

Incorrectcrontab -r 12

Incorrect. crontab -r removes a user's entire cron table.

Correctatrm 12

Correct. atrm 12 removes job 12.

An example you can run in a temporary verification environment.

atrm --help 2>&1 | sed -n '1,8p'

ジョブ番号を引数に取る使用方法

Foundation review

A scheduler for recurring jobs described by a time-field table.

A scheduler for one-time jobs queued for a specified time.

A scheduler that can run periodic jobs after a system was unavailable.

Question IDKL-102-1048

Environmentatrm help / ジョブ削除なし

Last technical review2026-08-13

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