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2 xmlns:xlink="http://www.w3.org/1999/xlink"
3 xmlns:xi="http://www.w3.org/2001/XInclude">
4 <refmeta>
5 <refentrytitle><command>nixos-version</command>
6 </refentrytitle><manvolnum>8</manvolnum>
7 <refmiscinfo class="source">NixOS</refmiscinfo>
8 </refmeta>
9 <refnamediv>
10 <refname><command>nixos-version</command></refname>
11 <refpurpose>show the NixOS version</refpurpose>
12 </refnamediv>
13 <refsynopsisdiv>
14 <cmdsynopsis>
15 <command>nixos-version</command>
16 <arg>
17 <option>--hash</option>
18 </arg>
19
20 <arg>
21 <option>--revision</option>
22 </arg>
23
24 <arg>
25 <option>--json</option>
26 </arg>
27
28 </cmdsynopsis>
29 </refsynopsisdiv>
30
31 <refsection>
32 <title>Description</title>
33 <para>
34 This command shows the version of the currently active NixOS configuration.
35 For example:
36<screen><prompt>$ </prompt>nixos-version
3716.03.1011.6317da4 (Emu)
38</screen>
39 The version consists of the following elements:
40 <variablelist>
41 <varlistentry>
42 <term>
43 <literal>16.03</literal>
44 </term>
45 <listitem>
46 <para>
47 The NixOS release, indicating the year and month in which it was
48 released (e.g. March 2016).
49 </para>
50 </listitem>
51 </varlistentry>
52 <varlistentry>
53 <term>
54 <literal>1011</literal>
55 </term>
56 <listitem>
57 <para>
58 The number of commits in the Nixpkgs Git repository between the start of
59 the release branch and the commit from which this version was built.
60 This ensures that NixOS versions are monotonically increasing. It is
61 <literal>git</literal> when the current NixOS configuration was built
62 from a checkout of the Nixpkgs Git repository rather than from a NixOS
63 channel.
64 </para>
65 </listitem>
66 </varlistentry>
67 <varlistentry>
68 <term>
69 <literal>6317da4</literal>
70 </term>
71 <listitem>
72 <para>
73 The first 7 characters of the commit in the Nixpkgs Git repository from
74 which this version was built.
75 </para>
76 </listitem>
77 </varlistentry>
78 <varlistentry>
79 <term>
80 <literal>Emu</literal>
81 </term>
82 <listitem>
83 <para>
84 The code name of the NixOS release. The first letter of the code name
85 indicates that this is the N'th stable NixOS release; for example, Emu
86 is the fifth release.
87 </para>
88 </listitem>
89 </varlistentry>
90 </variablelist>
91 </para>
92 </refsection>
93
94 <refsection>
95 <title>Options</title>
96
97 <para>
98 This command accepts the following options:
99 </para>
100
101 <variablelist>
102
103 <varlistentry>
104 <term>
105 <option>--hash</option>
106 </term>
107 <term>
108 <option>--revision</option>
109 </term>
110 <listitem>
111 <para>
112 Show the full SHA1 hash of the Git commit from which this configuration
113 was built, e.g.
114<screen><prompt>$ </prompt>nixos-version --hash
1156317da40006f6bc2480c6781999c52d88dde2acf
116</screen>
117 </para>
118 </listitem>
119 </varlistentry>
120
121 <varlistentry>
122 <term>
123 <option>--json</option>
124 </term>
125 <listitem>
126 <para>
127 Print a JSON representation of the versions of NixOS and the
128 top-level configuration flake.
129 </para>
130 </listitem>
131 </varlistentry>
132
133 </variablelist>
134
135 </refsection>
136
137</refentry>