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Clean up AWS Security groups
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| ``` | |
| aws elb describe-load-balancers --query 'LoadBalancerDescriptions[*].SecurityGroups' --output text | tr '\t' '\n' | sort | uniq > used.txt | |
| aws ec2 describe-instances --query 'Reservations[*].Instances[*].SecurityGroups[*].GroupId' --output text | tr '\t' '\n' | sort | uniq >> used.txt | |
| aws rds describe-db-instances --query 'DBInstances[*].VpcSecurityGroups[*].VpcSecurityGroupId' --output text | tr '\t' '\n' | sort | uniq >> used.txt | |
| comm -23 <(aws ec2 describe-security-groups --query 'SecurityGroups[*].[GroupName,GroupId]' --output text | grep -v "default" | cut -f2| sort) <(cat used.txt | sort | uniq ) | |
| ``` |
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