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";
}

[download]
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_

[download]


John.
--

In reply to Re: ASCII Rulers by jmcnamara
in thread ASCII Rulers by grinder

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