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# Package Management {#sec-package-management}
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This section describes how to add additional packages to your system.
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NixOS has two distinct styles of package management:
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- *Declarative*, where you declare what packages you want in your
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`configuration.nix`. Every time you run `nixos-rebuild`, NixOS will
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ensure that you get a consistent set of binaries corresponding to
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your specification.
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- *Ad hoc*, where you install, upgrade and uninstall packages via the
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`nix-env` command. This style allows mixing packages from different
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Nixpkgs versions. It's the only choice for non-root users.
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2023-02-22 10:55:15 +00:00
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```{=include=} sections
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declarative-packages.section.md
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ad-hoc-packages.section.md
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```
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