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=over

=item -model-dir

Specify an alternate directory to find model files. Mostly useful for
tests.

=item -root-dir

Specify a pseudo root directory to read and write the configuration
files. (Actual default directory and file names depends on the model
(See C<-model> option). For instance, if you specify C<~/mytest>, the
C</etc/ssh/sshd_config> files will be written in C<~/mytest/etc/ssh/>
directory.

=item -stack-trace

Provides a full stack trace when exiting on error.

=item -try-app-as-model

When set, try to load a model using directly the application name specified as 3rd parameter
on the command line. Experimental.

=back

=head1 Embedding cme

You can use cme from another program by using C<-ui simple>
option. This way you will be able to send command on the standard input
of C<cme> and get the results from the standard output.

=head1 Logging

All Config::Model logging is now based on L<Log::Log4perl>.
Logging can be configured in the following files:

=over

=item *

 ~/.log4config-model

=item *

 /etc/log4config-model.conf

=back

A sample of a C<.log4config-model> is provided in contrib directory in C<Config::Model>
distribution of on L<github|https://github.com/dod38fr/config-model/blob/master/contrib/log4config-model>

Without these files, the following Log4perl config is used:

 log4perl.rootLogger=WARN, Screen
 log4perl.logger.Model.Legacy = INFO, SimpleScreen
 log4perl.additivity.Model.Legacy = 0

 log4perl.appender.Screen        = Log::Log4perl::Appender::Screen
 log4perl.appender.Screen.stderr = 0
 log4perl.appender.Screen.layout = Log::Log4perl::Layout::PatternLayout
 log4perl.appender.Screen.layout.ConversionPattern = %M %m (line %L)%n

 log4perl.appender.SimpleScreen        = Log::Log4perl::Appender::Screen
 log4perl.appender.SimpleScreen.stderr = 0
 log4perl.appender.SimpleScreen.layout = Log::Log4perl::Layout::PatternLayout
 log4perl.appender.SimpleScreen.layout.ConversionPattern = %p: %m%n

 log4perl.oneMessagePerAppender = 1

Log4perl uses the following categories:

=over

=item Anything

=item Anything::Change

Trace change notification through configuration tree and instance.

=item Backend

=item Backend::Debian::Dpkg

=item Backend::Debian::Dpkg::Control

=item Backend::Debian::Dpkg::Copyright

=item Backend::Fstab

=item Backend::IniFile

=item Backend::PlainFile

=item Backend::ShellVar

=item Backend::Yaml

=item FuseUI

=item Instance

=item Loader

=item Model::Searcher

=item Tree::Element::CheckList

=item Tree::Element::Id

=item Tree::Element::Id::Hash

=item Tree::Element::Id::List

=item Tree::Element::Value

=item Tree::Element::Value::Dependency

=item Tree::Node

=item Tree::Node::Warped

=item ValueComputer

=item Warper