jq:错误:无法遍历字符串 [英] jq: error: Cannot iterate over string

问题描述

有人可以解释以下警告吗?

could someone please explain below warning?

输入文件为:

{
 "env": "DC",
 "hosts" :
[
{
  "apt_update_last_success": "1495991703",
  "architecture": "amd64",
  "hostname": "h1"
},
{
  "apt_update_last_success": "1495991703",
  "architecture": "amd64",
  "hostname": "h2"
},
{
  "apt_update_last_success": "1496045706",
  "architecture": "amd64",
  "hostname": "h3"
},
{
  "apt_update_last_success": "1496045705",
  "architecture": "amd64",
  "hostname": "h4"
},
{
  "apt_update_last_success": "1496049305",
  "architecture": "amd64",
  "hostname": "h5"
},
{
  "apt_update_last_success": "1496049307",
  "architecture": "amd64",
  "hostname": "h6"
}
]
}

jq命令返回预期的结果，但还会显示我不知道为什么的警告:

the jq command returns what expected but also prints the warning I dont know why:

$ jq -r '.[][] | select(.hostname=="h6")' ddd.json
jq: error: Cannot iterate over string
{
  "apt_update_last_success": "1496049307",
  "architecture": "amd64",
  "hostname": "h6"
}

请告诉我如何摆脱这种情况.

please tell me how to get rid of this.

谢谢.

推荐答案

问题出在您的符号.[][]中.您的输入只是一个 对象 ，但是您试图将其表示为容器" .[][]的容器".

The issue is in your notation .[][]. Your input is just an object but you are trying to present it as a "container" of "containers" .[][].

正确的方法是:

jq '.hosts[] | select(.hostname=="h6")' ddd.json
{
  "apt_update_last_success": "1496049307",
  "architecture": "amd64",
  "hostname": "h6"
}

---

此外，在 jq 1.5 上，此jq -r '.[][] | select(.hostname=="h6")' ddd.json不会返回预期的对象，而只会打印 jq: error (at jq1:36): Cannot iterate over string ("DC")

---

Besides, on jq 1.5 this jq -r '.[][] | select(.hostname=="h6")' ddd.json doesn't return the expected object but only prints jq: error (at jq1:36): Cannot iterate over string ("DC")

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