Cron job Every half hour
*/30 * * * *
minute
hour
day (month)
month
day (week)
Every 30 minutes
Field breakdown
| Field | Value | Meaning |
|---|---|---|
| minute | */30 | every 30 minutes |
| hour | * | any value |
| day (month) | * | any value |
| month | * | any value |
| day (week) | * | any value |
Crontab line
*/30 * * * * /path/to/script.shThe expression */30 * * * * schedules a cron job to run every half hour. This schedule belongs to the "Hour" category and is frequently used for periodic maintenance tasks, report generation, or batch processing that runs several times throughout the day.