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There are two optional parameters that can be passed, a file
name to use instead of the current one, and a reference of a
hash to write out instead of the currently loaded one.

  $config->write(
    config_file => '/path/to/somewhere/else',
    configuration => $settings);

The method returns true on success. If the file already exists
then it is backed up first. The write is not 'atomic' or
locked for reading in anyway. If the file cannot be written to
then it will die.

Configuration data passed by this method is only written to
file, it is not stored in the internal configuration object.
To store data in the internal use the set_configuration data
method. The option to pass a hash_ref in this method may
be removed in future versions.

=head2 get_error