:utf8 on input is insecure. 
binmode STDIN,  ":utf8";
binmode STDOUT, ":utf8";

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should be 

binmode STDIN,  ":encoding(UTF-8)";
binmode STDOUT, ":encoding(UTF-8)";
binmode STDERR, ":encoding(UTF-8)";

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and can be replaced with 

use open ':std', ':encoding(UTF-8)';

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or better yet 

use open ':std', ':locale';

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:utf8 on input is insecure. 
open(IN, "<utf8", "sample.txt");

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should be 

open(IN, "<:encoding(UTF-8)", "sample.txt");

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and can be replaced with 

use open IO => ':encoding(UTF-8)';

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or 

use open IO => ':locale';

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use utf8;

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indicates the source file is encoded using UTF-8. Without it, Perl assumes it's encoded using iso-latin-1.

None of the above decodes the content of @ARGV, data read from open(FH, '-') or data read via <>. The last is being worked on.

In reply to Re: Pragma to handle unicode characters by ikegami
in thread Pragma to handle unicode characters by wanradt

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