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Anatomy of a Cron Schedule Expression

Chapter: 12 — File Management, Packages, and Remote Access on the Pi 500+

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About This Poster

The chapter explains cron's five time fields in one dense paragraph — this poster breaks the */15 * * * * /home/pi/battery_check.sh example into six labeled segments students can check while writing their own crontab entries.

How to Use

  • Explore — hover or tap a numbered marker to read about that field.
  • Quiz — test whether you can identify each field from a visual hint alone.
  • Edit mode — open main.html?edit=true to drag markers and recalibrate positions once the poster image is generated.

Labeled Structures

  1. Minute Field
  2. Hour Field
  3. Day-of-Month Field
  4. Month Field
  5. Day-of-Week Field
  6. Command