Scheduling a one-time command | LinuC Level 1 102 Exam original practice question

1.08.2Basic

Pass the command through standard input to at.

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.

at: A scheduler that queues a command for one execution at a specified time.
Standard input: The input stream from which at reads the command to schedule.
One-time job: A scheduled task intended to run once rather than on a recurring timetable.
atq: A command that lists pending at jobs instead of creating one.

Detailed explanation

Incorrectat 18:30 /usr/local/bin/report

Incorrect. This is not the usual at input form.

Correctecho '/usr/local/bin/report' | at 18:30

Correct. It feeds the command to at for 18:30.

Incorrectatq 18:30 /usr/local/bin/report

Incorrect. atq lists existing jobs.

Incorrectatrm 18:30 /usr/local/bin/report

Incorrect. atrm removes jobs by ID.

An example you can run in a temporary verification environment.

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

atの時刻指定を含む使用方法

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-102-1046

Environmentat help / ジョブ登録なし

Last technical review2026-08-13

More practice in this area