Cron Expression
0,30 * * * *
Cron Expression: Cron Every Half Hour
Learn how to create a cron expression for 'cron every half hour'. Runs at the top and bottom of every hour with our free cron generator tool.
Expression Breakdown
0,30
Minute(0-59)
*
Hour(0-23)
*
Day(1-31)
*
Month(1-12)
*
Weekday(0-6)
| Field | Value | Meaning |
|---|---|---|
| Minute | 0,30 | At minute 0,30 |
| Hour | * | Any hour |
| Day of Month | * | Any day |
| Month | * | Any month |
| Day of Week | * | Any day of the week |
This cron expression represents: cron every half hour
Cron Expression
0,30 * * * *
What This Expression Does
Runs at the top and bottom of every hour
Use Cases
This cron schedule is commonly used for:
- System health monitoring
- Report generation
- Database maintenance
- Cache refresh
How to Use
- Copy the cron expression above
- Open your crontab with
crontab -e - Add a new line with:
0,30 * * * * /path/to/your/script.sh - Save and exit
Alternative Formats
-
With logging:
0,30 * * * * /path/to/script.sh >> /var/log/cron.log 2>&1 -
With email notification:
0,30 * * * * /path/to/script.sh || mail -s "Cron job failed" admin@example.com