AWS Shell Scripting

1) Stop EC2 Instances by Tag - Finds and stops all running EC2 instances with a given tag key and value.

#!/bin/bash

TAG_KEY="Environment"
TAG_VALUE="Development"

INSTANCE_IDS=$(aws ec2 describe-instances \
--filters "Name=tag:${TAG_KEY},Values=${TAG_VALUE}" "Name=instance-state-name,Values=running" \
--query "Reservations[*].Instances[*].InstanceId" \
--output text)

if [ -z "$INSTANCE_IDS" ]; then
echo "No running instances found with tag $TAG_KEY=$TAG_VALUE."
exit 0
fi

echo "Stopping instances: $INSTANCE_IDS"
aws ec2 stop-instances --instance-ids $INSTANCE_IDS