using jq to return multiple elements? - json

Question

I'm trying to use jq to return multiple elements from a JSON object. The data is coming from an AWS cli lookup, this is just a tiny section of the output:
{
"ReservedInstancesOfferings": [{
"OfferingClass": "convertible",
"OfferingType": "No Upfront",
"AvailabilityZone": "ap-southeast-2a",
"InstanceTenancy": "default",
"PricingDetails": [],
"ProductDescription": "Linux/UNIX",
"UsagePrice": 0.0,
"RecurringCharges": [{
"Amount": 0.167,
"Frequency": "Hourly"
}],
"Marketplace": false,
"CurrencyCode": "USD",
"FixedPrice": 0.0,
"Duration": 94608000,
"Scope": "Availability Zone",
"ReservedInstancesOfferingId": "1fc8c02b-bcc0-42b8-82ef-47c6f6d1c1b5",
"InstanceType": "c4.xlarge"
},
{
"OfferingClass": "convertible",
"OfferingType": "No Upfront",
"AvailabilityZone": "ap-southeast-2a",
"InstanceTenancy": "dedicated",
"PricingDetails": [],
"ProductDescription": "Red Hat Enterprise Linux",
"UsagePrice": 0.0,
"RecurringCharges": [{
"Amount": 0.243,
"Frequency": "Hourly"
}],
"Marketplace": false,
"CurrencyCode": "USD",
"FixedPrice": 0.0,
"Duration": 94608000,
"Scope": "Availability Zone",
"ReservedInstancesOfferingId": "24aaceee-f54e-4882-aba3-ce710a5036c9",
"InstanceType": "c4.xlarge"
}
]
}
I'm trying to extract the fields:
.ReservedInstancesOfferings[].ProductDescription
.ReservedInstancesOfferings[].InstanceType
.ReservedInstancesOfferings[].RecurringCharges[].Amount
I would like to output to appear like this:
"Red Hat Enterprise Linux"
"c4.xlarge"
0.183
As you can see above I understand how to extract all the elements individually, but I can't work out how to put them all together to attain the desired output. I've trued separating the queries with a comma, but that doesn't provide the desired output.
Any help would be very much appreciated.
Thank you!
EDIT:
Oh oh, I got it! Full answer is below. Boy oh boy jq is powerful!
Hopefully this helps someone :)

Answer 1

OK, so I managed to get what I was after. I still have a little tidying up to do as some of the input fields aren't completely uniform, but it's close enough to move forward with:
aws ec2 describe-reserved-instances-offerings --availability-zone "ap-southeast-2a" --instance-type "c4.xlarge" |
jq '.ReservedInstancesOfferings[] | [.ProductDescription, .InstanceType, .RecurringCharges[].Amount]'
Output:
[
"Linux/UNIX",
"c4.xlarge",
0.167
]
[
"Red Hat Enterprise Linux",
"c4.xlarge",
0.243
]
[
"Red Hat Enterprise Linux",
"c4.xlarge",
0.227
]
[
"Linux/UNIX",
"c4.xlarge",
0.183
]
[
"SUSE Linux",
"c4.xlarge",
0.2
]