I'm delighted to find such a tool as this, and eager to start syncing my log files to S3 for consumption by EMR.

I have installed s3cmd version 1.5.0-alpha3
We have an IAM user "s3common" with an access key, but I can't find that it has a secret key.
s3cmd --configure asks for both access and secret keys. 
When will it ask for the user name, and where do I get the secret key?

Should I create a role instead? If so, how do I configure s3cmd?

Thanks for any suggestions!