IMO, the author's "copy data to stdout" example betrays a lack of language understanding. Here's a more idiomatic version: http://play.golang.org/p/ZWatRuj3Q_
Plus given Go's focus on external dependencies, a common task like reading commandline parameters can (and should) be done with a library that solved that problem for you already - don't reinvent the wheel, and such.
It's actually very simple code, if you're at all familiar with go. That's probably what I would have written just by sitting down at the computer to do so for work.