List public IP addresses of EC2 instances

Question

I want to list the public IP addresses of my EC2 instances using Bash, separated by a delimiter (space or a new-line).

I tried to pipe the output to jq with aws ec2 describe-instances | jq, but can't seem to isolate just the IP addresses.

Can this be done by aws alone, specifying arguments to jq, or something else entirely?

Answer 1

Directly from the aws cli:

aws ec2 describe-instances \   --query "Reservations[*].Instances[*].PublicIpAddress" \   --output=text 

Answer 2

• Filter on running instances (you can drop that part if you don't need it)
• Query for each PublicIPaddress and the Name Tag, handling when Name isn't set

aws ec2 describe-instances \   --filter "Name=instance-state-name,Values=running" \   --query "Reservations[*].Instances[*].[PublicIpAddress, Tags[?Key=='Name'].Value|[0]]" \   --output text