http://www.perlmonks.org?node_id=69266


in reply to ASCII Rulers

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"
}

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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"
}

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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

In Section Cool Uses for Perl