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LPI

102-500 · Question #115

Given the following user's crontab entry: 15 14 1-5 /usr/local/bin/example.sh When will the script /usr/local/bin/example.sh be executed?

The correct answer is E. At 14:15 local time, Monday to Friday. Crontab format: minute hour day-of-month month day-of-week command The five fields map to 15 14 1-5, meaning minute=15, hour=14, day-of-month=any (`), month=any (), day-of-week=1–5. In cron, day-of-week values 1–5 represent Monday through Friday, so the script runs at 14:15…

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Question

Given the following user's crontab entry: 15 14 * * 1-5 /usr/local/bin/example.sh When will the script /usr/local/bin/example.sh be executed?

Options

  • AAt 14:15 local time, January till May.
  • BAt 15:14 local time, 1st to 5th day of month.
  • CAt 14:15 local time, February till June.
  • DAt 14:15 local time, 1st to 5th day of month.
  • EAt 14:15 local time, Monday to Friday

How the community answered

(46 responses)
  • A
    11% (5)
  • B
    2% (1)
  • C
    4% (2)
  • D
    7% (3)
  • E
    76% (35)

Explanation

Crontab format: minute hour day-of-month month day-of-week command

The five fields map to 15 14 * * 1-5, meaning minute=15, hour=14, day-of-month=any (*), month=any (*), day-of-week=1–5. In cron, day-of-week values 1–5 represent Monday through Friday, so the script runs at 14:15 (2:15 PM) local time on weekdays - making E correct.

Why the distractors fail:

  • A & C misread the day-of-week field (1-5) as a month range (January–May or February–June); months use a separate field (position 4), which is * here.
  • B & D misread 1-5 as the day-of-month (position 3), which is also * here - and B additionally swaps the minute and hour values (15:14 instead of 14:15).

Memory tip: Memorize the field order with the phrase "M H D M W" - Minute, Hour, Day-of-month, Month, Weekday. When you see * * 1-5 at the end, the range is always in the weekday slot (0=Sunday, 1=Monday … 6=Saturday), never months or days of the month.

Topics

#crontab format#job scheduling#day-of-week field#cron syntax

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