I always look at these golf challenges and think "I bet x would be shorter" but it rarely is. Anyway:
sub ruler {
my($n,$r) = (int($_[0]+9)/10, ' ');
$r .= sprintf"%10s",$_ for (1..$n);
"$r\n" . '0123456789' x $n . "0\n";
}
The sprintf would save a few strokes in your code but nothing significant.
I'll take your word for it that there is a column 0. ;-)
For shorter rulers I often use a sequence like this which fits on one line and is easy to count::
123456789_123456789_123456789_123456789_123456789_123456789_
John.
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