How to tell how full HDD in terminal?

TY, I think I fudged my debian server as one of my HDD was 100% full. Sabnzbd, mediatomb and samba all stopped working lol.

Data was safe and it didn't matter as I needed to update the HW anyway.

Now using arch in a non-gui server, is this wise?
 
My arch desktop hasn't fell over yet either lol.

The server is only running sabnzbd, mediatomb, NFS, samba, transmission-cli. So not much to go wrong is there?
 
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