01-31-2013
I can see why you're puzzled, that took some thought.
Nothing at all is assigned to X. It's printing a newline. print "" would have the same effect, but they saved one character by using a blank variable. Just print all by itself with no parameters would print the entire line, not what you want.
The printf statements do not print newlines, those must be explicit when using printf. So it prints a bunch of things into one long line, then uses print "" to finish off the line.
Are you sure that's OFS,$i and not OFS $i ? Two things into a single %s is a syntax error as far as I know.
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