#! /usr/bin/env perl
use strict;
use warnings;

use Data::Dumper;


my %data = (
    what => [
        1,2,3
    ],
    ever => [
        qw( a b c )
    ],
);

my $file = "/tmp/filename.txt";


# save %data to file as %name
open my $wh, '>', $file or die "open($file,w) failed: $!";
print $wh Data::Dumper->Dump( [ \%data ], [ "*name" ] );
print $wh <<MESSAGE;
print "Hier schreibt ein Boeser Bube boese Sachen in die Datendatei....\n";
print "Diese prints aus der Datendatei werden ausgefuehrt...\n";
MESSAGE
close $wh or die "close($file) failed: $!";


###  B : read to a package variable
###  retrieve %name from file (you need to know %name before)
our %name;
do $file;


print Data::Dumper->Dump( [ \%name ], [ '*name_it' ] );