$ cat hash.conf
foo => 'bar',
baz => 'quux',

$ perl -MYAML -0 -e '%h=eval<>; YAML::DumpFile( "$ARGV\.yml", \%h)' hash.conf

$ cat hash.conf.yml
---
baz: quux
foo: bar

$ perl -MYAML -MData::Dumper -e '$h = YAML::LoadFile( shift() ); print Dumper $h' hash.conf.yml
$VAR1 = {
          'baz' => 'quux',
          'foo' => 'bar'
        };