A couple of minor golfish things, without really changing the algorithm:

sub ruler {
    my $n = 9 + shift; chop $n;
    join "", " ", map(" "x(9-/../).$_, 1..$n), "\n",
    "0123456789" x $n, "0\n"
}
[download]

But for filling exactly to (arg) columns (eg, to avoid wrapping when using $ENV{COLUMNS}):

sub ruler {
    my $n = shift;
    join"", " ", map(" "x(9-/../).$_, 1..$n/10), "\n",
    map(/.$/g, 0..$n), "\n"
}
[download]

update: or (of course) ye olde one-liner:perl -lwe 'print" ",map(" "x(9-/../).$_,1..$ARGV[0]/10),"\n",map/.$/g,0..shift'
further update: chipmunk got it.  He's almost using printf as a map!

p

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

Outside of code tags, you may need to use entities for some characters:

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.