$ irb
require 'aws/s3' AWS::S3::Base.establish_connection!( :access_key_id => 'abc', :secret_access_key => '123' ) b = AWS::S3::Bucket.find('electnext')
curl http://169.254.169.254/latest/meta-data/iam/security-credentials/staging-db
https://github.com/broamski/aws-mfa
pip install aws-mfa
Add aws_mfa_device = .... to your ~/.aws/credentials.
Then say:
AWS_PROFILE=foo aws-mfa --long-term-suffix=none --short-term-suffix=mfa AWS_PROFILE=foo-mfa aws ec2 describe-instances --region us-west-2