echo ü > umlaut
gzip -k umlaut

##</code><code>##

perl -e '
  use IO::Uncompress::Gunzip;
  binmode(STDOUT, ":utf8");
  open my $in, "<:utf8", "umlaut";
  $_=<$in>;
  print "Uncompressed: $_ ",ord($_),"\n";
  my $gin= IO::Uncompress::Gunzip->new("umlaut.gz");
  binmode($gin, ":utf8");
  $_=<$gin>;
  print "  Compressed: $_ ",ord($_),"\n";
'

##</code><code>##

perl -e '
  use IO::Uncompress::Gunzip;
  use Encode;
  binmode(STDOUT, ":utf8");
  my $gin= IO::Uncompress::Gunzip->new("umlaut.gz");
  $_=<$gin>;
  $_ = Encode::decode("UTF-8", $_);
  print "  Compressed: $_ ",ord($_),"\n";
'

##</code><code>##

        my $encoding = ":utf8";
        if ( $filename =~ /\.gz$/ ) {
            $encoding = ":gzip$encoding";
        }
        open $in, "<$encoding", $filename or die "Can't read $filename: $!\n";