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+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
+<!ENTITY % aptent SYSTEM "apt.ent"> %aptent;
+<!ENTITY % aptverbatiment SYSTEM "apt-verbatim.ent"> %aptverbatiment;
+<!ENTITY % aptvendor SYSTEM "apt-vendor.ent"> %aptvendor;
+]>
+
+<refentry>
+
+ <refentryinfo>
+ &apt-author.jgunthorpe;
+ &apt-author.team;
+ &apt-email;
+ &apt-product;
+ <!-- The last update date -->
+ <date>2013-11-30T00:00:00Z</date>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>apt-config</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="manual">APT</refmiscinfo>
+ </refmeta>
+
+ <!-- Man page title -->
+ <refnamediv>
+ <refname>apt-config</refname>
+ <refpurpose>APT Configuration Query program</refpurpose>
+ </refnamediv>
+
+ &synopsis-command-apt-config;
+
+ <refsect1><title>Description</title>
+ <para><command>apt-config</command> is an internal program used by various
+ portions of the APT suite to provide consistent configurability. It accesses
+ the main configuration file <filename>/etc/apt/apt.conf</filename> in a
+ manner that is easy to use for scripted applications.</para>
+
+ <para>Unless the <option>-h</option>, or <option>--help</option> option is
+ given, one of the commands below must be present.
+ </para>
+
+ <variablelist>
+ <varlistentry><term><option>shell</option></term>
+ <listitem><para>
+ shell is used to access the configuration information from a shell
+ script. It is given pairs of arguments, the first being a shell
+ variable and the second the configuration value to query. As output
+ it lists shell assignment commands for each value present.
+ In a shell script it should be used as follows:
+ </para>
+
+<informalexample><programlisting>
+OPTS="-f"
+RES=`apt-config shell OPTS MyApp::options`
+eval $RES
+</programlisting></informalexample>
+
+ <para>This will set the shell environment variable $OPTS to the value of
+ MyApp::options with a default of <option>-f</option>.</para>
+
+
+ <para>The configuration item may be postfixed with a /[fdbi]. f returns
+ file names, d returns directories, b returns true or false and i returns
+ an integer. Each of the returns is normalized and verified
+ internally.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry><term><option>dump</option></term>
+ <listitem><para>
+ Just show the contents of the configuration space.</para>
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1><title>options</title>
+ &apt-cmdblurb;
+
+ <variablelist>
+ <varlistentry>
+ <term><option>--empty</option></term>
+ <listitem><para>Include options which have an empty value. This is the default, so
+ use --no-empty to remove them from the output.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--format '<replaceable>&percnt;f &#x0022;&percnt;v&#x0022;;&percnt;n</replaceable>'</option></term>
+ <listitem><para>Defines the output of each config option. &percnt;t will be replaced with its individual name,
+ &percnt;f with its full hierarchical name and &percnt;v with its value.
+ Use uppercase letters and special characters in the value will be encoded to ensure that
+ it can e.g. be safely used in a quoted-string as defined by RFC822. Additionally
+ &percnt;n will be replaced by a newline, and &percnt;N by a tab. A &percnt; can be
+ printed by using &percnt;&percnt;.</para></listitem>
+ </varlistentry>
+
+ &apt-commonoptions;
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1><title>See Also</title>
+ <para>&apt-conf;
+ </para>
+ </refsect1>
+
+ <refsect1><title>Diagnostics</title>
+ <para><command>apt-config</command> returns zero on normal operation, decimal 100 on error.
+ </para>
+ </refsect1>
+
+ &manbugs;
+
+</refentry>
+