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   enc-converter cp1252 < file.txt > file_utf8.txt
#or
...
#or a mix:
   some-process | enc-converter koi8-r > file_utf8.txt
   enc-converter iso-8859-1 < file.txt | utf8-process

#!/usr/bin/perl

...
binmode STDOUT, ":utf8";

print while (<>);

perl -MEncode -le 'print for(Encode->encodings(":all"))'

perl -CO -pe 'BEGIN{binmode STDIN,":encoding(cp936)"}' < file.txt > fi
+le.utf8