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 requirement

Identify what must change and what must remain unchanged. Then choose the command whose scope matches that requirement.

Hint 2: Check each command's role

Separate commands that display information, change state, remove data, or affect a child process.

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

Check whether the command acts on the current shell, a new process, an existing process, or a file.

Use the supplied command and compare the output with the expected result.

Question IDKL-102-1048

Environmentatrm help / ジョブ削除なし

Last technical review2026-08-13