# Why do I see ENV and cannot select anything?

{% hint style="info" %} <mark style="color:orange;background-color:red;">ENV</mark> = This value was set by an environment variable.
{% endhint %}

When starting the software via the shell, various settings can be activated. These settings are called “environment variables” and are marked with <mark style="background-color:red;">ENV</mark>. If a variable is activated at startup, it is no longer possible to adjust it in the graphical user interface.

## Recommended variables

It is not mandatory to set variables. All settings can also be configured via the graphical user interface.

### All environment variables on GitHub

{% embed url="<https://github.com/datarhei/core#environment-variables>" %}
**External URL:** All environments variables on GitHub
{% endembed %}

## Learn more

{% content-ref url="../../premium-support-1" %}
[premium-support-1](https://docs.datarhei.com/restreamer/premium-support-1)
{% endcontent-ref %}

{% content-ref url="../../api/environment-variables" %}
[environment-variables](https://docs.datarhei.com/restreamer/api/environment-variables)
{% endcontent-ref %}

{% content-ref url="../faq/what-are-environment-variables" %}
[what-are-environment-variables](https://docs.datarhei.com/restreamer/knowledge-base/faq/what-are-environment-variables)
{% endcontent-ref %}

{% content-ref url="../user-guides" %}
[user-guides](https://docs.datarhei.com/restreamer/knowledge-base/user-guides)
{% endcontent-ref %}

{% content-ref url=".." %}
[..](https://docs.datarhei.com/restreamer/knowledge-base)
{% endcontent-ref %}