Iterate through Hash of Hashes

Here's how you would iterate through multidimensional hashes in Perl:

Create a hash first:

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

my %HoH = (
    flintstones => {
        husband   => "fred",
        wife   => "wilma",
        pal   => "barney",
    },
    jetsons => {
        husband   => "george",
        wife      => "jane",
        "his boy" => "elroy",  # Key quotes needed.
    },
    simpsons => {
        husband   => "homer",
        wife      => "marge",
        kid       => "bart",
    },
);

Connecting one system to multiple networks

Q. I have a Linux server that connects to the external network and internal. Both network cards have a gateway. How can I set it up, so that it can access both networks?

A. You would need to set up source routing. This can be done fairly easily, following those steps:

Open up /etc/iproute2/rt_tables, add those two at the bottom: 

DNS Memory consumption on Windows 2008 R2

Q. I did a fresh install of Windows 2008 R2 and my DNS memory consumption is going through the roof. If I reboot, it's ok briefly, but then it goes up again. How can I stop it?

A. There are a lot of discussions about DNS high memory utilization on Windows 2008 R2 floating around. A lot of them point to disabling EDNS, which does not decrease the memory usage. The real problem is in fact due to the ports that DNS opens up: 2500 UDP IPv4 and 2500 UDP IPv6. This is a nice and round number for a busy production DNS server, however, for an internal DNS in a small office this is way too much.

Multiple IP adresses for network device

Q. I am using Ubuntu Linux and I would like to know how to create alias for eth0 so that I can have multiple IP address?

A. To create alias for eth0 use ifconfig command. It is use to configure a network interface and aliases.

Assuming that your eth0 IP is 192.168.1.10 and you would like to create an alias eth0:0 with IP 192.168.1.11. Type the following command:

Find out if processor is 32bit or 64 (Linux)

Q. How can I find out if my processor is 64 bit or 32, under linux.

A. Open shell and type:

cat /proc/cpuinfo

You will get an output, most likely of more than one CPU. Let's just pick one and look at it:

Clear text formatting (Word)

Q. How do I clear formatting in Word 2007/2003?

A. Here are the steps:

1. Select the text that you want to clear the formatting from.
2. On the Home tab, in the Font group, do one of the following click Clear Formatting icon: