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diff --git a/nixpkgs/nixos/doc/manual/man-nixos-option.xml b/nixpkgs/nixos/doc/manual/man-nixos-option.xml
deleted file mode 100644
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--- a/nixpkgs/nixos/doc/manual/man-nixos-option.xml
+++ /dev/null
@@ -1,134 +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-option</command>
-  </refentrytitle><manvolnum>8</manvolnum>
-  <refmiscinfo class="source">NixOS</refmiscinfo>
-<!-- <refmiscinfo class="version"><xi:include href="version.txt" parse="text"/></refmiscinfo> -->
- </refmeta>
- <refnamediv>
-  <refname><command>nixos-option</command></refname>
-  <refpurpose>inspect a NixOS configuration</refpurpose>
- </refnamediv>
- <refsynopsisdiv>
-  <cmdsynopsis>
-   <command>nixos-option</command>
-
-   <arg>
-    <group choice='req'>
-     <arg choice='plain'><option>-r</option></arg>
-     <arg choice='plain'><option>--recursive</option></arg>
-    </group>
-   </arg>
-
-   <arg>
-    <option>-I</option> <replaceable>path</replaceable>
-   </arg>
-
-   <arg>
-    <replaceable>option.name</replaceable>
-   </arg>
-  </cmdsynopsis>
- </refsynopsisdiv>
- <refsection>
-  <title>Description</title>
-  <para>
-   This command evaluates the configuration specified in
-   <filename>/etc/nixos/configuration.nix</filename> and returns the properties
-   of the option name given as argument.
-  </para>
-  <para>
-   When the option name is not an option, the command prints the list of
-   attributes contained in the attribute set.
-  </para>
- </refsection>
- <refsection>
-  <title>Options</title>
-  <para>
-   This command accepts the following options:
-  </para>
-  <variablelist>
-   <varlistentry>
-    <term><option>-r</option></term>
-    <term><option>--recursive</option></term>
-    <listitem>
-     <para>
-      Print all the values at or below the specified path recursively.
-     </para>
-    </listitem>
-   </varlistentry>
-   <varlistentry>
-    <term>
-     <option>-I</option> <replaceable>path</replaceable>
-    </term>
-    <listitem>
-     <para>
-      This option is passed to the underlying
-      <command>nix-instantiate</command> invocation.
-     </para>
-    </listitem>
-   </varlistentry>
-  </variablelist>
- </refsection>
- <refsection>
-  <title>Environment</title>
-  <variablelist>
-   <varlistentry>
-    <term>
-     <envar>NIXOS_CONFIG</envar>
-    </term>
-    <listitem>
-     <para>
-      Path to the main NixOS configuration module. Defaults to
-      <filename>/etc/nixos/configuration.nix</filename>.
-     </para>
-    </listitem>
-   </varlistentry>
-  </variablelist>
- </refsection>
- <refsection>
-  <title>Examples</title>
-  <para>
-   Investigate option values:
-<screen><prompt>$ </prompt>nixos-option boot.loader
-This attribute set contains:
-generationsDir
-grub
-initScript
-
-<prompt>$ </prompt>nixos-option boot.loader.grub.enable
-Value:
-true
-
-Default:
-true
-
-Description:
-Whether to enable the GNU GRUB boot loader.
-
-Declared by:
-  "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/boot/loader/grub/grub.nix"
-
-Defined by:
-  "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/boot/loader/grub/grub.nix"
-</screen>
-  </para>
- </refsection>
- <refsection>
-  <title>Bugs</title>
-  <para>
-   The author listed in the following section is wrong. If there is any other
-   bug, please report to Nicolas Pierron.
-  </para>
- </refsection>
- <refsection>
-  <title>See also</title>
-  <para>
-   <citerefentry>
-    <refentrytitle>configuration.nix</refentrytitle>
-    <manvolnum>5</manvolnum>
-   </citerefentry>
-  </para>
- </refsection>
-</refentry>