>>112
Fix(IFS文字が頭と末尾にある場合。dirname,basenameにしたのは気分)&Variation
find . -name '*[ ()]*' -print | sort -r | (IFS=''; while read item; do
mv "$item" "$(dirname "$item")/$(basename "$item" | tr ' ()' '_')"
done)


find . -name '*[ ()]*' -print | sort -r | (IFS=''; while read item; do
dir="$(dirname "$item")"; newname="$(basename "$item" | tr ' ()' '_')"; newpath="$dir/$newname"
[ ! -e "$newpath" ] && mv "$item" "$newpath" || echo "can't rename $item, exists $newname" >&2
done
# can't rename $item 〜 メッセージは単なる目安


find . -name '*[ ()]*' -print | sort -r | (IFS=''; while read item; do
dir="${item%/*}"; newname="$(tr ' ()' '_' <<< ${item##*/})"

[ -e "$dir/$newname" ] && {
name="${newname%.*}_"
ext="${newname#*.}"; [ "$ext" = "$newname" ] && ext='' || ext=".$ext"
while [ -e "$dir/$name$ext" ]; do
name+='_'
done
newname="$name$ext"
}

mv "$item" "$dir/$newname"
done)