How to get list of instances attached to ELB in form of comma separated list

问题

I want to get list of all instances attached to an ELB (need to use them in further processing).

Here is what I have done so far :

aws elb describe-load-balancers --load-balancer-name 'my-elb' --output json --query "LoadBalancerDescriptions[*].Instances[*].InstanceId"

However, above command gives me the list in JSON format.

[
    [
        "i-05676776d8cd4ab5344b0d",
"i-05676776"
    ]
]

How can I do?

Thanks!

回答1:

--output text and pipe it to paste

aws elb describe-load-balancers --load-balancer-name 'my-elb' --output text --query "LoadBalancerDescriptions[*].Instances[*].InstanceId" | paste -d, -s

来源：https://stackoverflow.com/questions/42706884/how-to-get-list-of-instances-attached-to-elb-in-form-of-comma-separated-list