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@@ -1,158 +0,0 @@
-<refentry xmlns="http://docbook.org/ns/docbook"
-          xmlns:xlink="http://www.w3.org/1999/xlink"
-          xmlns:xi="http://www.w3.org/2001/XInclude">
- <refmeta>
-  <refentrytitle><command>nixos-version</command>
-  </refentrytitle><manvolnum>8</manvolnum>
-  <refmiscinfo class="source">NixOS</refmiscinfo>
- </refmeta>
- <refnamediv>
-  <refname><command>nixos-version</command></refname>
-  <refpurpose>show the NixOS version</refpurpose>
- </refnamediv>
- <refsynopsisdiv>
-  <cmdsynopsis>
-   <command>nixos-version</command>
-   <arg>
-    <option>--hash</option>
-   </arg>
-
-   <arg>
-    <option>--revision</option>
-   </arg>
-
-   <arg>
-    <option>--configuration-revision</option>
-   </arg>
-
-   <arg>
-    <option>--json</option>
-   </arg>
-
-  </cmdsynopsis>
- </refsynopsisdiv>
-
- <refsection>
-  <title>Description</title>
-  <para>
-   This command shows the version of the currently active NixOS configuration.
-   For example:
-<screen><prompt>$ </prompt>nixos-version
-16.03.1011.6317da4 (Emu)
-</screen>
-   The version consists of the following elements:
-   <variablelist>
-    <varlistentry>
-     <term>
-      <literal>16.03</literal>
-     </term>
-     <listitem>
-      <para>
-       The NixOS release, indicating the year and month in which it was
-       released (e.g. March 2016).
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <literal>1011</literal>
-     </term>
-     <listitem>
-      <para>
-       The number of commits in the Nixpkgs Git repository between the start of
-       the release branch and the commit from which this version was built.
-       This ensures that NixOS versions are monotonically increasing. It is
-       <literal>git</literal> when the current NixOS configuration was built
-       from a checkout of the Nixpkgs Git repository rather than from a NixOS
-       channel.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <literal>6317da4</literal>
-     </term>
-     <listitem>
-      <para>
-       The first 7 characters of the commit in the Nixpkgs Git repository from
-       which this version was built.
-      </para>
-     </listitem>
-    </varlistentry>
-    <varlistentry>
-     <term>
-      <literal>Emu</literal>
-     </term>
-     <listitem>
-      <para>
-       The code name of the NixOS release. The first letter of the code name
-       indicates that this is the N'th stable NixOS release; for example, Emu
-       is the fifth release.
-      </para>
-     </listitem>
-    </varlistentry>
-   </variablelist>
-  </para>
- </refsection>
-
- <refsection>
-  <title>Options</title>
-
-  <para>
-   This command accepts the following options:
-  </para>
-
-  <variablelist>
-
-   <varlistentry>
-    <term>
-     <option>--hash</option>
-    </term>
-    <term>
-     <option>--revision</option>
-    </term>
-    <listitem>
-     <para>
-      Show the full SHA1 hash of the Git commit from which this configuration
-      was built, e.g.
-<screen><prompt>$ </prompt>nixos-version --hash
-6317da40006f6bc2480c6781999c52d88dde2acf
-</screen>
-     </para>
-    </listitem>
-   </varlistentry>
-
-   <varlistentry>
-    <term>
-     <option>--configuration-revision</option>
-    </term>
-    <listitem>
-     <para>
-      Show the configuration revision if available. This could be the full SHA1
-      hash of the Git commit of the system flake, if you add
-      <screen>{ system.configurationRevision = self.rev or "dirty"; }</screen>
-      to the <screen>modules</screen> array of your flake.nix system configuration e.g.
-<screen><prompt>$ </prompt>nixos-version --configuration-revision
-aa314ebd1592f6cdd53cb5bba8bcae97d9323de8
-</screen>
-     </para>
-    </listitem>
-   </varlistentry>
-
-   <varlistentry>
-    <term>
-     <option>--json</option>
-    </term>
-    <listitem>
-     <para>
-      Print a JSON representation of the versions of NixOS and the
-      top-level configuration flake.
-     </para>
-    </listitem>
-   </varlistentry>
-
-  </variablelist>
-
- </refsection>
-
-</refentry>