I'm not sure if this is homework, but you certainly won't get that code to work.

#!/usr/bin/perl
use warnings;
use strict;

my %colorhash = ( CCgray => ["0","0","0"],
          CCwhite => ["1","0","0"],
          CCgrey => ["0","2","0"],
          CCBlue => ["0","0","3"]);

foreach my $colorname (keys %colorhash) {
  for my $i (0.. $#{ $colorhash{$colorname} } ) { 
    print "$i = $colorhash{$colorname}[$i] "; 
  }
  print "\n"; 
} 

my @light2dark = sort numsort (keys %colorhash); 

sub numsort { 
  $colorhash{$a}[0] <=> $colorhash{$b}[0] 
  or $colorhash{$a}[1] <=> $colorhash{$b}[1] 
  or $colorhash{$a}[2] <=> $colorhash{$b}[2]
}
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