The Anatomy of 5-Field Cron Syntax
A standard crontab line consists of 5 time fields separated by spaces: Minute (0-59), Hour (0-23), Day of Month (1-31), Month (1-12), and Day of Week (0-7, where both 0 and 7 represent Sunday).
Special operators grant immense flexibility: an asterisk (*) matches every unit, a comma (,) specifies lists (e.g. 1,15), a hyphen (-) defines ranges (e.g. 9-17), and a slash (/) specifies step intervals (e.g. */10).
Common Cloud Pitfalls: Time Zones & Overlapping Execution
If a scheduled database backup task takes 12 minutes to complete but cron runs every 10 minutes (*/10), concurrent processes collide, causing database deadlocks and high CPU spikes.
Always wrap scheduled scripts with flock (file locking) or mutex guards to guarantee single-instance execution.
Step-by-Step Tutorial
Select Execution Frequency
Choose minute, hourly, daily, weekly, or monthly intervals in DocSwift Cron Generator.
Review Natural Language Description
Verify the human-readable explanation (e.g. 'At minute 0 past every 2nd hour').
Copy Crontab Line
Copy the verified 5-field expression directly into your crontab or GitHub Action YAML.
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Frequently Asked Questions
What is the difference between AWS EventBridge cron and standard Linux cron?
AWS EventBridge uses a 6-field syntax that includes a mandatory Year field at the end and requires a question mark (?) in either Day-of-Month or Day-of-Week to avoid conflicts.
Can I run a cron job every 30 seconds?
Standard crontab operates with a minimum granularity of 1 minute. Running sub-minute intervals requires a sleep loop or specialized message queue workers.