Network UPS Tools "$ upsc [email protected]"

I have successfully installed Network UPS Tools addon and integration with my Eaton3S UPS. Thanks for Developers to make that so easy for me.

Now I can follow the critical parameter and create an automation to shut down my unit when needed.
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As being just an average Joe I was wondering this command described in documentation:

I must be stupid when trying this with SSH & Web Terminal:
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As a result:
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Am I totally lost? Where should I try the command? Plese Help …

Anyway this result does not affect to my system. I am happy about that but just as a learning point?

And I am playing with RPI3b+, HassOS 3.13, Supervisor 219, Home Assistant 0.108.8

Did you get anywhere with this?

NUT addon is running in its own container while terminal is operating in another one.
Use community (HACS) SSH & Web Terminal, not the core one and execute command

docker exec addon_a0d7b954_nut upsc [email protected]

In order to be able to execute that command You need to disable protected mode of the SSH & Web Teminal addon.
addon_a0d7b954_nut is the container of the NUT addon (read documentation of the addon)