# Cron Jobs

`ps -aux | grep cron`

or

`cat /etc/crontab`

<figure><img src="/files/dVB35mle1mMl0hdROoP0" alt=""><figcaption></figcaption></figure>

```
* * * * * comando_a_ejecutar
- - - - -
| | | | |
| | | | +--- Día de la semana (0 - 7, donde 0 y 7 son domingo)
| | | +----- Mes (1 - 12)
| | +------- Día del mes (1 - 31)
| +--------- Hora (0 - 23)
+----------- Minuto (0 - 59)
```

Ejemplo de explotación:

El script backup.sh fue configurado para ejecutarse cada minuto (en la captura). Vemos su contenido:

<figure><img src="/files/jD9pgx1mB7KxcCiXFqNn" alt=""><figcaption></figcaption></figure>

Podemos modificar el contenido y dar **permiso +x**

<figure><img src="/files/eTfxi0Uhqa3f7bguY9yJ" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/aqFuCheausgbhZk18tFx" alt=""><figcaption></figcaption></figure>


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