英文:
jq search for value and return scalar
问题
我是一个jq新手，正在努力摸索它的用法。
我想要搜索JSON对象中具有特定名称的任何键，并提取第一次出现的值，以将其分配给bash变量以备后用。例如，使用：
{
"fruit":{
"name":"apple","color":"green","sub":{
"name":"crab-apple","color":"red","size":"small"
}
}
}
如果我使用：
jq -r 'map(.name)|.[0]?'
我得到我要找的输出，具体来说是"apple"。另一方面，
jq -r 'map(.size)|.[0]?'
导致
[
null
]
不是标量值，也不是我想要找到的。
英文:
I'm a newbie with jq and struggling to bend it to my will.
I want to search a JSON object for any key with a given name and extract the value for the first occurrence in order to assign this to a bash variable for later use. e.g. with:
{
"fruit":{
"name":"apple","color":"green","sub":{
"name":"crab-apple","color":"red","size":"small"
}
}
}
If I use:
jq -r 'map(.name)|.[0]?'
I get the output I am looking for, specifically "apple". OTOH
jq -r 'map(.size)|.[0]?'
results in
[
null
]
Not a scalar value and not what I wanted to find.
Please don't tell me I should search based on other attributes or the structure of JSON object (unless you're going to explain how to do a depth-first vs breadth-first search).
答案1
得分: 2
你正在寻找这样的东西：
first(recurse | objects | select(has("name")) .name)
<sup>在线演示</sup>
英文:
You're looking for something like this:
first(recurse | objects | select(has("name")) .name)
<sup>Online demo</sup>
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