jq：无法使用 jq 从 Json 文件中检索键/值

Question

我有以下来自 curl 输出的 JSON，我需要从中检索 IP 地址。我尝试了以下 jq 查询，但出现以下错误。我尝试了其他几种方法，但没有运气

curl -sH "X-Requested-By: ambari" -u admin:admin -i http://${AMBARI_IP}:8080/api/v1/hosts?fields=Hosts/host_name,Hosts/ip | jq '.[] | {.items.Hosts.ip}'

jq: error: syntax error, unexpected FIELD (Unix shell quoting issues?) at <top-level>, line 1:
.[] | {.items.Hosts.ip}
jq: 1 compile error
(23) Failed writing body

下面是 curl 的输出

HTTP/1.1 200 OK
Date: Fri, 02 Jul 2021 21:04:27 GMT
X-Frame-Options: DENY
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Cache-Control: no-store
Pragma: no-cache
Set-Cookie: AMBARISESSIONID=123344.node0;Path=/;HttpOnly
Expires: Thu, 01 Jan 1970 00:00:00 GMT
User: admin
Content-Type: text/plain;charset=utf-8
X-Content-Type-Options: nosniff
Vary: Accept-Encoding, User-Agent
Transfer-Encoding: chunked
{
  "href" : "http://10.0.0.33:8080/api/v1/hosts?fields=Hosts/host_name,Hosts/ip",
  "items" : [
    {
      "href" : "http://10.0.0.33:8080/api/v1/hosts/sil.dev.test.com",
      "Hosts" : {
        "host_name" : "test123.sil.dev.test.com",
        "ip" : "10.135.3.119"
      }
    },
    {
      "href" : "http://10.0.0.33:8080/api/v1/hosts/test001.sil.dev.test.com",
      "Hosts" : {
        "cluster_name" : "test_cluster",
        "host_name" : "test001.sil.dev.test.com",
        "ip" : "10.0.0.33"
      }
    },
    {
      "href" : "http://10.0.0.33:8080/api/v1/hosts/test002.sil.dev.test.com",
      "Hosts" : {
        "cluster_name" : "test_cluster",
        "host_name" : "test002.sil.dev.test.com",
        "ip" : "10.0.0.34"
      }
    },
    {
      "href" : "http://10.0.0.33:8080/api/v1/hosts/test003.sil.dev.test.com",
      "Hosts" : {
        "cluster_name" : "test_cluster",
        "host_name" : "test003.sil.dev.test.com",
        "ip" : "10.0.0.35"
      }
    },
}

Answer 1

试试jq '.items[].Hosts.ip'。这会从外部对象中获取 .items 键，迭代 items 数组，然后从每个对象的路径 .Hosts.ip 中提取值。

PS > cat a.json
{
  "href" : "http://10.0.0.33:8080/api/v1/hosts?fields=Hosts/host_name,Hosts/ip",
  "items" : [
    {
      "href" : "http://10.0.0.33:8080/api/v1/hosts/sil.dev.test.com",
      "Hosts" : {
        "host_name" : "test123.sil.dev.test.com",
        "ip" : "10.135.3.119"
      }
    },
    {
      "href" : "http://10.0.0.33:8080/api/v1/hosts/test001.sil.dev.test.com",
      "Hosts" : {
        "cluster_name" : "test_cluster",
        "host_name" : "test001.sil.dev.test.com",
        "ip" : "10.0.0.33"
      }
    },
    {
      "href" : "http://10.0.0.33:8080/api/v1/hosts/test002.sil.dev.test.com",
      "Hosts" : {
        "cluster_name" : "test_cluster",
        "host_name" : "test002.sil.dev.test.com",
        "ip" : "10.0.0.34"
      }
    },
    {
      "href" : "http://10.0.0.33:8080/api/v1/hosts/test003.sil.dev.test.com",
      "Hosts" : {
        "cluster_name" : "test_cluster",
        "host_name" : "test003.sil.dev.test.com",
        "ip" : "10.0.0.35"
      }
    }
  ]
}
PS > cat a.json | jq '.items[].Hosts.ip'
"10.135.3.119"
"10.0.0.33"
"10.0.0.34"
"10.0.0.35"
PS > cat a.json | jq -r '.items[].Hosts.ip'
10.135.3.119
10.0.0.33
10.0.0.34
10.0.0.35