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Nix-OS is an odd beast, it is very, very different from any other Linux based OS I have used.
This is both good and bad
The good is that everything is configured and installed by editing and a single installation file positioned at /etc/nixos/configuration.nix and the Nix-OS install then interprets this and installs/updates/recreates itself using a single command nixos-rebuild switch ( add –upgrade to upgrade)