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ShiftJISからUTF8へ一括変換
find /path/to/directory -type f -exec bash -c 'iconv -f SHIFT_JIS -t UTF-8 "$1" -o "$1.utf8" && mv "$1.utf8" "$1"' _ {} \;
find /path/to/directory -type f -exec bash -c 'iconv -f SHIFT_JIS -t UTF-8 "$1" -o "$1.utf8" && mv "$1.utf8" "$1"' _ {} \;