Use JQ to parse AWS CLI requests

aws-jq-simple-requests.sh

#!/bin/bash

# Display the EIPs associated with all of your instances:
aws ec2 describe-instances \
    | jq -r .Reservations[].Instances[].PublicIpAddress

# Display the EIP attached to a specific EC2 instance:
aws ec2 describe-instances --instance-ids i-1a2b3c4d5e6f7g8h9i \
    | jq -r .Reservations[0].Instances[0].PublicIpAddress

# Retrieve all tags associated with an instance:
aws ec2 describe-instances --instance-ids i-1a2b3c4d5e6f7g8h9i \
    | jq -r .Reservations[0].Instances[0].Tags

# List all EC2 instances attached to an ELB:
aws elb describe-load-balancers \
    | jq -r .LoadBalancerDescriptions[0].Instances[0].InstanceId

# Put a value into a variable for logic. This request tells you 
# the state of an instance [stopped|running]
state=`aws ec2 describe-instances --instance-ids i-02438e5e535b738a0 \
    | jq -r .Reservations[0].Instances[0].State.Name`
echo $state