Here is my quick and nasty solution. This loads the first
file into a hash so it may use up lots of memory. Though
if it too is 130,000 lines that is only a few megabytes.
Should run fast! (Tested also ;-)
use strict;
die "Syntax: $0 <names> < djb-file > output-file" unless @ARGV == 1;
my %name_to_ip;
open(IN, "<".shift) or die;
while (<IN>)
{
chomp;
my ($ip, $name) = split /:/;
$name_to_ip{$ip} = $name;
}
close IN or die;
while (<>)
{
chomp;
my ($name, $ip) = split /:/;
print $name_to_ip{$ip} || $name, ":", $ip, "\n";
}
