title: How to get IAM Credentials from Cognito Username/Password from CLI?
body: <p>I want to be able to get IAM Credentials from an IdentityPool via Cognito user/pass authentication from the command line.</p>
  
  <p>I can't find anything in the aws-cli that does this in one-step ( or even in a number of steps such that it could be used in a bash script)?
  Does anyone know about any cli tools that do it?</p>
  
  <p>I am trying to write a quick script to get IAM Credentials to plugin to Postman for testing an API.</p>