echo '<?xml version="1.0" encoding="utf-8"?><d:multistatus xmlns:d="DAV:"><d:response><d:href>/SN/</d:href><d:propstat><d:status>HTTP/1.1 200 OK</d:status><d:prop><d:quota-used-bytes>21496748972</d:quota-used-bytes><d:quota-available-bytes>23600407636</d:quota-available-bytes></d:prop></d:propstat></d:response></d:multistatus>' | sed -r 's/>/>\n/g'| sed -r 's/([^<]+)(<.+)/\1\n\2/'| awk '$0~/<[^\/?].*|^[^<]/{r++}{f=r;while(f>1){printf "\t"; f--};printf $0"\n"} $0~/^[^<]|<\/.*/{r--}'

<?xml version="1.0" encoding="utf-8"?>
<d:multistatus xmlns:d="DAV:">
    <d:response>
        <d:href>
            /SN/
        </d:href>
        <d:propstat>
            <d:status>
                HTTP/1.1 200 OK
            </d:status>
            <d:prop>
                <d:quota-used-bytes>
                    21496748972
                </d:quota-used-bytes>
                <d:quota-available-bytes>
                    23600407636
                </d:quota-available-bytes>
            </d:prop>
        </d:propstat>
    </d:response>
</d:multistatus>