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<?xml version="1.0" encoding="utf-8" standalone="no"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
<!ENTITY % aptent SYSTEM "apt.ent">
%aptent;
<!ENTITY % aptverbatiment SYSTEM "apt-verbatim.ent">
%aptverbatiment;
]>
<refentry>
<refentryinfo>
&apt-author.jgunthorpe;
&apt-author.team;
&apt-email;
&apt-product;
<!-- The last update date -->
<date>29 February 2004</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>
<!-- Arguments -->
<refsynopsisdiv>
<cmdsynopsis>
<command>apt-config</command>
<arg><option>-hv</option></arg>
<arg><option>-o=<replaceable>config string</replaceable></option></arg>
<arg><option>-c=<replaceable>file</replaceable></option></arg>
<group choice="req">
<arg>shell</arg>
<arg>dump</arg>
</group>
</cmdsynopsis>
</refsynopsisdiv>
<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 by 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>shell</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 a series of shell assignments commands for each present value.
In a shell script it should be used like:
</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>dump</term>
<listitem><para>
Just show the contents of the configuration space.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1><title>options</title>
&apt-cmdblurb;
<variablelist>
&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>
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