???
$ awk '
> /<td>/,/<\/td>/ {
> if (/<\/td>/) {
> print gyujto, $0
> gyujto=""
> } else {
> gyujto = gyujto " " $0
> }
> next
> }
> { print }
> '
<td>
1
2
3
4
5
</td>
<td> 1 2 3 4 5 </td>
$