Cron Expression
0 */4 * * *
Cron Expression: Cron Every 4 Hours
Learn how to create a cron expression for 'cron every 4 hours'. Runs every 4 hours with our free cron generator tool.
Expression Breakdown
0
Minute(0-59)
*/4
Hour(0-23)
*
Day(1-31)
*
Month(1-12)
*
Weekday(0-6)
| Field | Value | Meaning |
|---|---|---|
| Minute | 0 | At minute 0 |
| Hour | */4 | Every 4 hours |
| Day of Month | * | Any day |
| Month | * | Any month |
| Day of Week | * | Any day of the week |
This cron expression represents: cron every 4 hours
Cron Expression
0 */4 * * *
What This Expression Does
Runs every 4 hours
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 */4 * * * /path/to/your/script.sh - Save and exit
Alternative Formats
-
With logging:
0 */4 * * * /path/to/script.sh >> /var/log/cron.log 2>&1 -
With email notification:
0 */4 * * * /path/to/script.sh || mail -s "Cron job failed" admin@example.com