1. Do nothing when there's no AWS CLI 2. Print error message gracefully if AWS CLI failed
mssh is a Python client for accessing EC2 instances via AWS EC2 Instance Connect. References: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-methods.html#ec2-instance-connect-connecting-ec2-cli https://github.com/aws/aws-ec2-instance-connect-cli https://pypi.org/project/ec2instanceconnectcli/