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<!-- -*- mode: sgml; mode: fold -*- -->
<!doctype refentry PUBLIC "-//OASIS//DTD DocBook V3.1//EN" [
<!ENTITY % aptent SYSTEM "apt.ent">
%aptent;
]>
<refentry>
&apt-docinfo;
<refmeta>
<refentrytitle>apt-config</>
<manvolnum>8</>
</refmeta>
<!-- Man page title -->
<refnamediv>
<refname>apt-config</>
<refpurpose>APT Configuration Query program</>
</refnamediv>
<!-- Arguments -->
<refsynopsisdiv>
<cmdsynopsis>
<command>apt-config</>
<arg><option>-hv</></arg>
<arg><option>-o=<replaceable/config string/</></arg>
<arg><option>-c=<replaceable/file/</></arg>
<group choice=req>
<arg>shell</>
<arg>dump</>
</group>
</cmdsynopsis>
</refsynopsisdiv>
<RefSect1><Title>Description</>
<para>
<command/apt-config/ is an internal program used by various portions of
the APT suite to provide consistent configurability. It accesses the main
configuarion file <filename>/etc/apt/apt.conf</> in a manner that is
easy to use by scripted applications.
<para>
Unless the <option/-h/, or <option/--help/ 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/.
<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.
</VarListEntry>
<VarListEntry><Term>dump</Term>
<ListItem><Para>
Just show the contents of the configuration space.
</VarListEntry>
</VariableList>
</RefSect1>
<RefSect1><Title>Options</>
&apt-cmdblurb;
<VariableList>
&apt-commonoptions;
</VariableList>
</RefSect1>
<RefSect1><Title>See Also</>
<para>
&apt-conf;
</RefSect1>
<RefSect1><Title>Diagnostics</>
<para>
<command/apt-config/ returns zero on normal operation, decimal 100 on error.
</RefSect1>
&manbugs;
&manauthor;
</refentry>
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