如何在Perl中管理配置文件？

cpan install Config::General

key1 = value1
key2 = value2
key3 = value3

use Config::General;

my $config_file = 'config.txt';
my $config = Config::General->new($config_file);
my %config_hash = $config->getall;

my $key1_value = $config_hash{key1};
my $key2_value = $config_hash{key2};
my $key3_value = $config_hash{key3};

$config_hash{key1} = 'new_value1';
$config_hash{key2} = 'new_value2';
$config_hash{key3} = 'new_value3';

$config->save($config_file);