Shell script resolution for garbled Chinese-encoded Japanese UTAU voicebanks

convert.sh

#!/bin/sh
for f in ./*
do
  mv $f `echo $f | iconv -f UTF-8 -t GBK | iconv -f shift-jis -t UTF-8`
done

Or a one-liner that can be directly executed, of course
for f in ./*; do mv $f `echo $f | iconv -f UTF-8 -t GBK | iconv -f shift-jis -t UTF-8`; done

This method works well with filenames in the mojibake form of _偁偁偄偁偆偊偁.wav.
The reason for not using convmv is that it does not accept the nonsense produced in the middle of the conversion.
I find this way works kind of more elegant than 菲菲更名宝贝.
Please do test out the result of iconv command before the actual conversion.