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  1. or download this
    LANG=ru_RU LANGUAGE=ru_RU:ru LC_ALL=ru_RU.CP1251 LC_MESSAGES=ru_RU.CP1
    +251 perl  -e 'open my $f, "<", "notafile" or print $!'
    
  2. or download this
    LANG=ru_RU LANGUAGE=ru_RU:ru LC_ALL=ru_RU.utf8 perl  -e 'open my $f, "
    +<", "notafile" or print $!'
    
  3. or download this
    my $errno = decode("SOMEENCODING", $!)