KeyPair.md

Bash script that uses the AWS CLI to retrieve the name of the key pair used for multiple EC2 instances

Prerequisites

• To access AWS services with the AWS CLI, you need an AWS account and IAM credentials. When running AWS CLI commands, the AWS CLI needs to have access to those AWS credentials.
• Install the latest release of the AWS CLI version on your computer.
• Configure the AWS CLI

Here is the bash script:

#!/bin/bash

# set the region
region=ap-south-1

# set the instance ids
instance_ids="i-0016a559a927f2452 i-0c6f05f8ab0694103"

# loop through each instance id and retrieve the key pair name
for id in $instance_ids; do
    key_name=$(aws ec2 describe-instances --region $region --instance-ids $id --query 'Reservations[*].Instances[*].KeyName' --output text)
    echo "Instance $id is using key pair: $key_name"
done

To use this script, replace the region variable with your desired region code and update the instance_ids variable with the IDs of the instances you want to check.

Save this script as a file with a .sh extension, make it executable with the chmod +x command.

chmod +x keypair.sh

Then, simply run the script in your terminal and it will output the name of the key pair used for each instance.

[Optional] You can also use > operator to save the output in txt file.

sh keypair.sh > output.txt