Manual: apt-config

APT-CONFIG(8) APT APT-CONFIG(8)

NAME
apt-config - APT Configuration Query program

SYNOPSIS

apt-config [--empty] [--format '%f "%v";%n'] [-o=config_string] [-c=config_file] {shell | dump | {-v | --version} |
{-h | --help}}

DESCRIPTION
apt-config is an internal program used by various portions of the APT suite to provide consistent configurability. It
accesses the main configuration file /etc/apt/apt.conf in a manner that is easy to use for scripted applications.

Unless the -h, or --help option is given, one of the commands below must be present.

shell
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:

OPTS="-f"
RES=`apt-config shell OPTS MyApp::options`
eval $RES
This will set the shell environment variable $OPTS to the value of MyApp::options with a default of -f.

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.

dump
Just show the contents of the configuration space.

OPTIONS
All command line options may be set using the configuration file, the descriptions indicate the configuration option
to set. For boolean options you can override the config file by using something like -f-,--no-f, -f=no or several
other variations.

--empty
Include options which have an empty value. This is the default, so use --no-empty to remove them from the output.

--format '%f "%v";%n'
Defines the output of each config option. %t will be replaced with its individual name, %f with its full
hierarchical name and %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 %n will
be replaced by a newline, and %N by a tab. A % can be printed by using %%.

-h, --help
Show a short usage summary.

-v, --version
Show the program version.

--audit
Show audit (and notice) messages. This overrides the quiet option, but only for notice messages, not progress
ones.

-c, --config-file
Configuration File; Specify a configuration file to use. The program will read the default configuration file and
then this configuration file. If configuration settings need to be set before the default configuration files are
parsed specify a file with the APT_CONFIG environment variable. See apt.conf(5) for syntax information.

-o, --option
Set a Configuration Option; This will set an arbitrary configuration option. The syntax is -o Foo::Bar=bar. -o
and --option can be used multiple times to set different options.

--cli-version
Requests a specific CLI version. This is a pattern that takes a MAJOR.MINOR version. You may omit the MINOR
version, in which case the latest supported minor level will be used.

Version tracks are presented as follows: The version 3.2 has equivalent versions 0.32, 1.22, and 2.12,
implementing new features for their specified major versions.

A special case is the X.9 version pattern: A version like 2.9 is followed by 3.0, but 2.10 follows directly on
2.8; given that we use odd version numbers as development series (2.9 is the 3.0 development series).

This feature has been introduced in APT 3.1.10, and replaces the binary-specific configuration. You may use the
APT::Version to similar effect on older binaries, for example, use -o APT::Version=2 to make apt(8) behave like
the 2.x series.

The default value is the current APT version for apt(8) and 0.(10 * major + minor) for the classic commands. The
0.X series is soft-deprecated and the other commands will roll over to the 2.x series in the future.

--no-color, --color
Turn colors on or off. Colors are on by default on supported terminals for apt(8) and can also be disabled using
the NO_COLOR or APT_NO_COLOR environment variables, or further configured by the APT::Color configuration option
and scope, see apt.conf(5) for information on that.

Manual: apt-config

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