Najlepiej użyć chyba perla albo... PHPa
Kod
perl -pe 'BEGIN { binmode STDIN, ":utf8" }; tr/x{0104}x{0106}x{0118}x{0141}x{0143}x{00D3}x{015A}x{0179}x{017B}x{0105}x{0107}x{0119}x{0142}x{0144}x{00F3}x{015B}x{017A}x{017C}/xa1xc6xcaxa3xd1xd3xa6xacxafxb1xe6xeaxb3xf1xf3xb6xbcxbf/' < plik.unicode > plik.iso
[php:1:efc31ccaa3]<?php
print strtr(file_get_contents('plik.unicode'), array("xc4x84" => "xa1", "xc4x86" => "xc6", "xc4x98" => "xca", "xc5x81" => "xa3", "xc5x83" => "xd1", " xc3x93" => "xd3", "xc5x9a" => "xa6", "xc5xb9" => "xac", "xc5xbb" => " xaf", "xc4x85" => "xb1", "xc4x87" => "xe6", "xc4x99" => "xea", "xc5x8 2" => "xb3", "xc5x84" => "xf1", "xc3xb3" => "xf3", "xc5x9b" => "xb6", "xc5xba" => "xbc", "xc5xbc" => "xbf"));
?>[/php:1:efc31ccaa3]