for i in $(find .); do file -ib $i ; done | sort | uniq
inode/directory; charset=binary
inode/x-empty; charset=binary
text/html; charset=utf-8
text/plain; charset=us-ascii
text/xml; charset=us-ascii
text/xml; charset=utf-8
application/x-rpm; charset=binary

s3cmd put --recursive dir -M --default-mime-type "text/plain;charset=UTF-8" --acl-public --add-header="Cache-Control:public,max-age=15552000" s3://my-test-bucket/