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1<chapter xmlns="http://docbook.org/ns/docbook"
2 xmlns:xlink="http://www.w3.org/1999/xlink"
3 xmlns:xi="http://www.w3.org/2001/XInclude"
4 version="5.0"
5 xml:id="sec-package-management">
6 <title>Package Management</title>
7 <para>
8 This section describes how to add additional packages to your system. NixOS
9 has two distinct styles of package management:
10 <itemizedlist>
11 <listitem>
12 <para>
13 <emphasis>Declarative</emphasis>, where you declare what packages you want
14 in your <filename>configuration.nix</filename>. Every time you run
15 <command>nixos-rebuild</command>, NixOS will ensure that you get a
16 consistent set of binaries corresponding to your specification.
17 </para>
18 </listitem>
19 <listitem>
20 <para>
21 <emphasis>Ad hoc</emphasis>, where you install, upgrade and uninstall
22 packages via the <command>nix-env</command> command. This style allows
23 mixing packages from different Nixpkgs versions. It’s the only choice
24 for non-root users.
25 </para>
26 </listitem>
27 </itemizedlist>
28 </para>
29 <xi:include href="declarative-packages.xml" />
30 <xi:include href="ad-hoc-packages.xml" />
31</chapter>