[S3tools-general] s3cmd put not doing anything. Why?

[Ryan G. <ngs...@gm...>]

I'm trying to upload myfile.tar.gz to a s3 bucket called my_data that
contains a directory set1, using the following command.

Why would this not work?  It seems (intuitive) to me, that is should upload
the local file to the s3 bucket, but it doesn't.  Why?

[ryang@bic fastq]$ s3cmd -v put myfile.tar.gz s3://my_data/set1/
INFO: Compiling list of local files...
INFO: Applying --exclude/--include
INFO: Summary: 0 local files to upload

I'm assuming 1.1.0-beta:

[ryang@bic fastq]$ s3cmd --version
s3cmd version 1.1.0-beta3