Reading user crontab time fields | LPIC-1 102-500 Exam original practice question

107.2Standard

Interpret a line in a user's crontab edited with crontab -e.

30 2 * * * /home/alice/bin/backup

When does this job run?

Hint 1: Focus on scheduling scope

Separate recurring and one-time jobs, access-control files, and execution context before comparing the choices.

Hint 2: Key terms

Review the short definitions of recurring jobs, one-time jobs, and scheduling controls.

Cron expression: A recurring schedule written with minute, hour, day-of-month, month, and weekday fields.
Five time fields: The standard cron fields from minute through weekday; seconds are not included.
Minute field: The first cron field that selects minutes from 0 through 59.
Command field: The text after the five time fields that runs when the schedule matches.

Detailed explanation

Correct毎日2時30分

Correct. Minute 30 and hour 2 mean 02:30 each day when the other fields are wildcards.

Incorrect毎月2日30時

Incorrect. Cron has no 30 o'clock and the field order is wrong.

Incorrect毎時2分30秒

Incorrect. Standard cron has no seconds field.

Incorrect毎月30日の2時

Incorrect. The day-of-month field is a wildcard in this line.

An example you can run in a temporary verification environment.

printf '%s\n' '30 2 * * * /home/alice/bin/backup' | awk '{print "minute="$1, "hour="$2}'

minute=30 hour=2

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 IDKP-107-685

Environmentawk / 合成crontab行

Last technical review2026-08-13

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