Linux/88.Configuration_File_Options.md at main · Akshayredekar07/Linux · GitHub

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Various Possibilities of Specifying Date and Time

Every minute
```
* * * * *
```
Every 2 minutes
```
*/2 * * * *
```
Every even minute
```
*/2 * * * *
```
Every odd minute
```
1-59/2 * * * *
```
Every 3 minutes
```
*/3 * * * *
```
Every 4 minutes
```
*/4 * * * *
```
Every 15 minutes (quarter-hour)
```
*/15 * * * *
```
Every hour at 30th minute
```
30 * * * *
```
Every half hour
```
*/30 * * * *
```
Every hour
```
0 * * * *
```
Every 2 hours
```
0 */2 * * *
```
Every even hour
```
0 */2 * * *
```
Every odd hour
```
0 1-23/2 * * *
```
Execute at 6:00, 14:00, and 22:00
```
0 6,14,22 * * *
```
Every day at midnight
```
0 0 * * *
```
Every day at 1:00 AM
```
0 1 * * *
```
Every Sunday only once
```
0 0 * * SUN
```
Only on weekdays
```
0 0 * * 1-5
```
Only on weekends
```
0 0 * * 6,0
```
Every month on the 1st
```
0 0 1 * *
```
Every other month
```
0 0 1 */2 *
```
Every 6 months
```
0 0 1 */6 *
```
Every year on January 1st
```
0 0 1 1 *
```
Every leap year
```
0 0 29 2 *
```
Every February 14th
```
0 0 14 2 *
```

Crontab Shortcuts

Shortcut	Equivalent Schedule
`@yearly`	`0 0 1 1 *`
`@annually`	`0 0 1 1 *`
`@monthly`	`0 0 1 * *`
`@weekly`	`0 0 * * 0`
`@daily`	`0 0 * * *`
`@midnight`	`0 0 * * *`
`@hourly`	`0 0-23 * * *`

Example:

@hourly echo "Hello from hourly crontab" >> ~/Desktop/hours.txt

Notes:

Crontab shortcuts may not be supported by most Linux flavors.
Use Crontab Guru to verify your configurations.