# Ejecutar tareas crontab

Podemos indicarle que hacer y cuando por medio de cron en el router, necesitamos que tenga Firmware merlin, tener activado la ejecución de scripts en la carpeta `/jffs/scripts` y un usb conectado al router.

Para crear un cron, la sintaxis es la siguiente, importante! este cron se borrara en cada reinicio del router

```sh
cru a NOMBRE_DE_LA_TAREA "programacion comandos"
```

\
Listar los cron que tenemos corriendo.

```sh
r00t@RT-AX88U_Pro:/# cru l
11 14 */7 * * service restart_letsencrypt #LetsEncrypt#
*/2 * * * * /etc/openvpn/server1/vpn-watchdog1.sh #CheckVPNServer1#
0 */12 * * * /bin/sync && /bin/echo 3 > /proc/sys/vm/drop_caches #freeram#
0 */2 * * * /jffs/scripts/status.sh #telegram#
25 17 * * * sh /jffs/scripts/firewall banmalware #Skynet_banmalware#
21 1 * * Mon sh /jffs/scripts/firewall update #Skynet_autoupdate#
0 * * * * sh /jffs/scripts/firewall save #Skynet_save#
34 */12 * * * sh /jffs/scripts/firewall debug genstats #Skynet_genstats#
r00t@RT-AX88U_Pro:/#
```

Si queremos que sea persistente, ya que en cada reinicio se borran, debemos crear un script y guárdalo con permisos de ejecución en `/jffs/scripts`

Mi script en `/jffs/scripts/post-mount.sh`

```sh
#!/bin/sh
echo "Mount file swap..."
swapon /tmp/mnt/sda1/file.swp

echo "Add Free RAM to cron..."
cru a freeram "0 */12 * * * /bin/sync && /bin/echo 3 > /proc/sys/vm/drop_caches"

echo "Add Telegram to cron..."
cru a telegram "0 */2 * * * sh /jffs/scripts/status.sh"
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://blog.azagra.dev/asus-router/ejecutar-tareas-crontab.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.