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# CRON usage
## Configuration for CRON
Cronjobs are usually CLI scripts. But JoliNotif's Unix/Linux drivers are GUI
applications. This means you need to specify the display where the notification
will be sent.
You can achieve this by setting the `XDG_RUNTIME_DIR` environment variable in your
cronjob:
```
* * * * * XDG_RUNTIME_DIR=/run/user/$(id -u) php /path/to/your/script
```
> **Note**
> On some system, you may also/instead need to set DISPLAY env var and/or to
> run `xhost +local:`. For more information, please have a look at
> [https://help.ubuntu.com/community/CronHowto#GUI_Applications](https://help.ubuntu.com/community/CronHowto#GUI_Applications)
## Next readings
* [CLI usage](05-cli-usage.md)
Previous pages:
* [Drivers](03-drivers.md)
* [Notification](02-notification.md)
* [Basic usage](01-basic-usage.md)
* [README](../README.md)
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