Use jq to extract sublist into a single line

From,

jq '.DistributionList.Items[] | select(.Aliases.Items != null) | .Id + "," + .DomainName' << EOF
{
"DistributionList": {
    "Items": [
        {
        "Id": "EG3MOA",
        "Status": "Deployed",
        "LastModifiedTime": "2022-12-03T19:32:35.007000+00:00",
        "DomainName": "a***.cloudfront.net",
            "Aliases": {
                "Quantity": 1,
                "Items": [
                "a.domain.tld",
                "b.domain.tld"
                ]
            }
        },
        {
        "Id": "EG3MOB",
        "Status": "Deployed",
        "LastModifiedTime": "2022-12-03T19:32:35.007000+00:00",
        "DomainName": "b***.cloudfront.net",
            "Aliases": {
                "Quantity": 1,
                "Items": [
                "c.domain.tld",
                "d.domain.tld"
                ]
            }
        }
    ]
    }
}
EOF

It yields:

"EG3MOA,a***.cloudfront.net"
"EG3MOB,b***.cloudfront.net"

How would I also get the `Alias Items, so that I have:

"EG3MOA,a***.cloudfront.net,'a.domain.tld,b.domain.tld'"
"EG3MOB,b***.cloudfront.net,'c.domain.tld,d.domain.tld'"

>Solution :

To extract the Aliases.Items array and combine it into a single string, you can use the join() method in jq. For example, this jq filter would extract the Id, DomainName, and Aliases.Items values and combine them into a single string, with the Aliases.Items values joined together with a comma:

jq '.DistributionList.Items[] | select(.Aliases.Items != null) | .Id + "," + .DomainName + ",'" + (.Aliases.Items | join(",")) + "'"

Here’s an example of how you could use this filter in your command:

jq '.DistributionList.Items[] | select(.Aliases.Items != null) | .Id + "," + .DomainName + ",'" + (.Aliases.Items | join(",")) + "'" << EOF
{
"DistributionList": {
    "Items": [
        {
        "Id": "EG3MOA",
        "Status": "Deployed",
        "LastModifiedTime": "2022-12-03T19:32:35.007000+00:00",
        "DomainName": "a***.cloudfront.net",
            "Aliases": {
                "Quantity": 1,
                "Items": [
                "a.domain.tld",
                "b.domain.tld"
                ]
            }
        },
        {
        "Id": "EG3MOB",
        "Status": "Deployed",
        "LastModifiedTime": "2022-12-03T19:32:35.007000+00:00",
        "DomainName": "b***.cloudfront.net",
            "Aliases": {
                "Quantity": 1,
                "Items": [
                "c.domain.tld",
                "d.domain.tld"
                ]
            }
        }
    ]
    }
}
EOF

This should output the following:

"EG3MOA,a***.cloudfront.net,'a.domain.tld,b.domain.tld'"
"EG3MOB,b***.cloudfront.net,'c.domain.tld,d.domain.tld'"