====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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