Question

我有以下json数据：

{"jsonrpc":"2.0","result":[],"id":1}
{"jsonrpc":"2.0","result":[{"hostmacroid":"2392","hostid":"10953","macro":"{$GATEWAY}","value":"10.25.230.1"}],"id":1}
{"jsonrpc":"2.0","result":[{"hostmacroid":"1893","hostid":"12093","macro":"{$GATEWAY}","value":"10.38.118.1"}],"id":1}
{"jsonrpc":"2.0","result":[{"hostmacroid":"2400","hostid":"14471","macro":"{$GATEWAY}","value":"10.25.230.1"}],"id":1}
{"jsonrpc":"2.0","result":[{"hostmacroid":"799","hostid":"10798","macro":"{$GATEWAY}","value":"10.36.136.1"}],"id":1}
{"jsonrpc":"2.0","result":[],"id":1}
{"jsonrpc":"2.0","result":[{"hostmacroid":"1433","hostid":"10857","macro":"{$GATEWAY}","value":"10.38.24.129"}],"id":1}
{"jsonrpc":"2.0","result":[{"hostmacroid":"842","hostid":"13159","macro":"{$GATEWAY}","value":"10.38.113.1"}],"id":1}
{"jsonrpc":"2.0","result":[],"id":1}

我试图提取＆＃34;值的价值＆＃34;每一行的字段。 jq -r '.result[].value' <jsonfile>完美无缺，但没有考虑到没有＆＃34;值＆＃34;的JSON行。领域。我希望它为他们打印一个空行。这有可能与jq？

Answer 1

这样可行：

jq -r '.result | if length > 0 then .[0].value else "" end'

Answer 2

您可以使用：

jq -r '.result[].value // "" ' a.json

这使用或运算符//。如果存在.result[].value，则会打印该值，否则会打印一个空行。

Answer 3

由于false // X和null // X生成X，.result[].value // ""可能不是您想要的所有情况。

为了达到我所理解的目标，您可以使用以下过滤器：

.result[] | if has("value") then .value else "" end

使用jq显示非现有字段的空行

3 个答案: