Aliases are great for saving typing time, and you probably already have a handful set up. But you may not be aware that it's possible to set up aliases that take command line variables as an argument. Read on for an example.

Virtual aliases can map to addresses that do not terminate on the local system while regular aliases can only map to addresses which terminate on the local system. If you were going to add a number of domains you would want to create a map file. Create the file /etc/postfix/virtual_alias_domains and enter one domain on each line and include the creation date on the right.

Network security is a primary consideration in any decision to host a website as the threats are becoming more widespread and persistent every day. One means of providing additional protection is to invest in a firewall.

The ethtool utility provides ethernet card information and management to die for. Do you think you have a network bottleneck that’s somehow related to your NIC’s speed or other settings? If so, ethtool might be the utility that will save the day and many painful conversations.

One of the really useful features almost every Unix shell has is support for command aliases – a way to run a command or a series of Unix commands using a shorter name you get associated with such commands.

The Eye-Fi card is a nifty solution for adding wireless capabilities to virtually any digital camera, but it does have one serious drawback: the card relies on proprietary software that runs only on Windows and Mac OS X. Fortunately, the standalone Eye-Fi server written in Python will happily run on Linux, courtesy of the enterprising hacker Jeff Tchang.

Your business card is a symbol of yourself and your company. It is a very important marketing tool, and will probably be the first encounter potential clients have with you or your company. Designing a business card takes a lot of thought and one of the things you must consider is whether you want to print one side of the card or two.

Familiarity with command prompts and shell scripts is still necessary if you want to get the most from your GNU/Linux system, but the less time you spend doing that the better, right? Two powerful ways to minimize your time at the command line are shell aliases and functions.

Many organizations face a productivity problem with employees who abuse chat programs like MSN Messenger. Some IT departments are instructed to block this kind of traffic for users who either abuse or simply don't require the software.