Quick presets
Fields:
minute (0–59) · hour (0–23) · day (1–31) · month (1–12) · weekday (0–7)
Syntax:
Syntax:
* any ·
*/n every n ·
n-m range ·
n,m list ·
n-m/o range+step
—
00:00
06:00
12:00
18:00
23:59
Build a complete crontab entry
Enter a command above to generate the full crontab line.
Common command suffixes:
>> /var/log/script.log 2>&1 — append stdout+stderr to log> /dev/null 2>&1 — suppress all output2>&1 | tee -a /var/log/script.log — log and display
Common Patterns
*/5 * * * *
Every 5 minutes
0 */2 * * *
Every 2 hours
0 0 * * *
Daily at midnight
30 2 * * 6
2:30am every Saturday
0 0 1,15 * *
1st and 15th of month
0 9-17 * * 1-5
Business hours (Mon–Fri)
0 0 * * 0
Every Sunday midnight
0 0 1 * *
First of every month
Special Characters
| * | Any value — matches all |
| */n | Every n units (*/15 = every 15 min) |
| n-m | Range (9-17 = 9am to 5pm) |
| n,m,o | List (1,15 = 1st and 15th) |
| n-m/o | Range+step (0-12/2 = every 2h, midnight to noon) |
| 0 or 7 | Weekday Sunday (both values valid) |