Cron Expression for Every 2 Hours
0 */2 * * *→Runs every 2 hours at minute 00
Minute
0–59
*/2
Hour
0–23
*
Day
1–31
*
Month
1–12
*
Weekday
0–7
Quick Examples
How It Works
The expression
0 */2 * * * runs at minute 0 of every even hour: 00:00, 02:00, 04:00 … 22:00. The step */2 is applied to the hour field. This is useful for medium-frequency batch jobs that would be wasteful to run every hour but need more than a daily cadence.Common Use Cases
- 1Database backup snapshots
- 2Sitemap regeneration for medium-traffic sites
- 3Aggregating IoT sensor data
Linux Crontab Example
0 */2 * * * pg_dump mydb > /backups/mydb_$(date +\%H).sqlAdd this line to your crontab with crontab -e
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More Every X Hours
Runs once every hour at minute 0
0 * * * *
Runs every 3 hours at minute 0
0 */3 * * *
Runs 4 times a day: 00:00, 06:00, 12:00, 18:00
0 */6 * * *
Runs twice a day: midnight and noon
0 */12 * * *
Runs every 4 hours at minute 0
0 */4 * * *
Runs every 8 hours at minute 0
0 */8 * * *
Runs at 15 minutes past every hour
15 * * * *
Runs at 30 minutes past every hour
30 * * * *
Runs at 45 minutes past every hour
45 * * * *
Runs every 5 hours at minute 0
0 */5 * * *
Runs every 7 hours at minute 0
0 */7 * * *