title: S3: How to do a partial read / seek without downloading the complete file?
body: <p>Although they resemble files, objects in Amazon S3 aren't really "files", just like S3 buckets aren't really directories. On a Unix system I can use <code>head</code> to preview the first few lines of a file, no matter how large it is, but I can't do this on a S3. So how do I do a partial read on S3?</p>