Config::Tiny is what I use for ini-style config files. It allows you to access the items close to how shagbark suggested:

use Config::Tiny;
my $ini = Config::Tiny->read( 'config.ini', 'utf8' );
my $foo = $ini->{bar}->{foo};
$foo = 'baz';
$ini->{bar}->{foo} = $foo;
$ini->write( 'config.ini', 'utf8' );
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