Using jq to fetch key value from json output

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暖寄归人
暖寄归人 2021-02-12 08:29

I have a file that looks as below:

{
  \"repositories\": [
   {
    \"id\": \"156c48fc-f208-43e8-a631-4d12deb89fa4\",
    \"namespace\": \"rhel12\",
    \"namesp         


        
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  • 2021-02-12 08:46

    Here is another solution. Assuming the requirements

    I want to get only name values with each of them in a new line so that I can use while read -r line.

    Can you please how can i get output in format rhel12/rhel6.6 In other words, I need o/p in format namespace/name

    if the data is in data.json then the command

    jq -M -r '.repositories[] | "\(.namespace)/\(.name)"' data.json
    

    should produce

    rhel12/rhel6.6
    rhel12/rhel7
    
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  • 2021-02-12 08:50

    You need to combine filters by means of | operator:

    $ jq -r '.[] | .[] | .name' test.json 
    rhel6.6
    rhel7
    

    The first .[] fetches repositories array. The next .[] fetches all the items of the repositories array. Finally, .name extracts properties from the array items(objects).

    Note, the first .[] works on object because it is a documented feature:

    .[]
        If you use the .[index] syntax, but omit the index entirely, it
        will return all of the elements of an array...
    
        You can also use this on an object, and it will return all the
        values of the object.
    
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  • 2021-02-12 09:00

    You want to look at the repositories array instead of treating the input as an array:

    $ jq -r '.repositories[].name' file
    rhel6.6
    rhel7
    
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