in reply to help neeed in identifying file encoding

You can use File::BOM to determine the encoding of a file:

open $fh, '<', 'd:\input.txt' or die 'Could not open file';
$encoding = get_encoding_from_filehandle($fh);

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The intelligent reader will judge for himself. Without examining the facts fully and fairly, there is no way of knowing whether vox populi is really vox dei, or merely vox asinorum. — Cyrus H. Gordon

In Section Seekers of Perl Wisdom