xmlstarlet - 使用 xmlstarlet 提取多个值

Question

如何从所有元素中提取“失败”并将它们相加？

<gateway>
    <smscs>
        <count>3</count>
        <smsc>
            <id>a</id>
            <received><sms>0</sms><dlr>0</dlr></received>
            <sent><sms>10537</sms><dlr>0</dlr></sent>
            <failed>13</failed>
            <queued>6272</queued>
        </smsc>
        <smsc>
            <id>b</id>
            <received><sms>0</sms><dlr>0</dlr></received>
            <sent><sms>10530</sms><dlr>0</dlr></sent>
            <failed>10</failed>
            <queued>6284</queued>
        </smsc>
        <smsc>
            <id>c</id>
            <received><sms>0</sms><dlr>0</dlr></received>
            <sent><sms>10679</sms><dlr>0</dlr></sent>
            <failed>11</failed>
            <queued>6291</queued>
        </smsc>
    </smscs>
</gateway>

Answer 1

我只是用过

xmlstarlet sel -t -v "sum(/gateway/smscs/smsc/failed)" -n input.xml

哪个返回了

34

想法是使用 sum()该函数采用节点集并返回所有元素的字符串值转换为数字的总和。