Whitelist an IP in Amazon AWS security group from command line

To white list an IP in Amazon AWS security group using aws command line tool, run

aws ec2 authorize-security-group-ingress --group-id SECURITY_GROUP_ID_HERE --protocol tcp --port PORT_HERE --cidr IP_IN_CIDR_HERE

Example

aws ec2 authorize-security-group-ingress --group-id sg-a777eee6  --protocol tcp --port 443 --cidr 94.31.33.128/27