jq - 在处理数组中的行时打印换行符

Question

Suppose I have a json like this:

{
  "records": [
    {
        "id": 1,
        "name": "hello"
    },
    {
        "id": 2,
        "name": "world"    
    }
  ]
}

I could do this:

$ jq -r '.records[] | "id: \(.id) name: \(.name)"' afile.json
id: 1 name: hello
id: 2 name: world

How can I insert new lines so that I could get this:

id: 1
name: hello

id: 2
name: world

Answer 1

One of many ways would be simply to add \n to the end of the string specification.

If the extra newline at the end is unwanted, you could, for example, use sed '$d' to remove it.

Answer 2

Another option is to use map() combined with join("\n\n") to insert an \n between each iteration. This way there won't be a trailing newline:

jq -rj '.records | map("id: \(.id)\nname: \(.name)") | join("\n\n")' input.json

id: 1
name: hello

id: 2
name: world

---

--raw-output / -r :

With this option, if the filter's result is a string then it will be written directly to standard output rather than being formatted as a JSON string with quotes. This can be useful for making jq filters talk to non-JSON-based systems.

--join-output / -j :

Like -r but jq won't print a newline after each output.