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  1. or download this
    #!/usr/bin/perl
    use strict;
    ...
    print "That line is: $line\n";
    $line =~ s/\x{f6}/o/;
    print "That line in ascii is: $line\n";
    
  2. or download this
    open my $in, '-|:raw:encoding(utf8)', "echo \xc3\xb6" or die $!;