Table of Contents

Normal rebuild:

sudo nixos-rebuild switch


Update the root user's channel named ‘nixos’ before rebuilding the system:

 sudo nix-channel --update

or 

sudo nixos-rebuild switch --upgrade


Delete last 5 generations:

sudo nix-env --profile /nix/var/nix/profiles/system --delete-generations +5


Clear unused packages

sudo nix-collect-garbage -d


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