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use ConfigIni; #my own wrapper
use Getopt::Long;
...

#now %config holds all your parameters and they're properly initialize
+d -- the command line overrides anything in the ini file

sub get_options
{
...
    croak "Password must be specified in [General] ini file" if !defin
+ed $config->{password};
    croak "Data_dir must be specified in [General] section of ini file
+" if !defined $config->{data_dir};
} #sub init_config

package ConfigIni;

...
}

1;