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address 192.168.1.254 should be used as the default gateway, use the command route add default gw 192.168.1.254. If you need to change the default gateway, you should be aware that you first have to remove the old route. Use the route del command to do this. For example, to remove the current setting for the default gateway, use route del default gw.

In both Listings 8-11 and 8-12, we are averaging an expression, rather than just the values directly from the column of our table. We might want to do this for many reasons. Say in another database we have an Order table, which includes the columns Price and Quantity. The net value of each order can be found by multiplying the Price and Quantity. If we want to find the average value for all our orders, we can put the expression Price * Quantity in the parentheses, as in Listing 8-13.

Unfortunately, unlike with Windows, it s not very common to find Linux drivers on the CD that comes with the hardware. Even if you do find a Linux driver supplied, chances are that it will work with only certain enterprise-oriented versions of Linux, such as Red Hat Enterprise Linux or SUSE Linux Enterprise Desktop. Some drivers are usable but imperfect or lack features that are available in their Windows counterparts. At the time of this writing, Ubuntu has yet to gain the kind of momentum that leads manufacturers to specifically produce drivers for it, but this may change in the future, especially as more users encounter the system via Netbooks and mobile devices. Various OEMs have dipped their toes in the open source water. Dell and Shuttle are the biggest names currently bundling Linux with some of their desktop offerings, with smaller specialist companies like System 76 competing with excellent pre-installed offerings.

Note It s possible to use a program called alien to convert software installation packages designed for other distributions into Ubuntu installation files. Doing so isn t complicated but may not work well with driver files because of the subtle differences in where system files are stored across different Linux distributions. You can find more information about alien at http://kitenet.net/~joey/code/alien/. It s contained within the Ubuntu software repositories and can be downloaded using the Ubuntu Software Center or Synaptic Package Manager. A graphical front end to alien is available at http://code.google.com/p/foxoman/wiki/PackageConverter.

If you know what information has to be entered when defining a route, it s easy to do it with either the ifconfig or the ip tool. The only differences are minor changes in the syntax that s used. To set the default gateway to 192.168.1.254 using the ip tool, use the ip route add default via 192.168.1.254 command. This command makes sure that all packets sent to non-local destinations are sent through 192.168.1.254. Likewise, you can delete the default route with ip route del default.

As discussed earlier in this book, Linux is an open source OS This means that the source code underlying Linux programs is available for study and even reuse This is a good thing when it comes to hardware drivers, because bugs in the code can be spotted and repaired by anyone with an interest in doing so If you consider that a bug in a graphics driver could mean your PC crashes every 5 minutes, the value of such an approach is abundantly clear Unfortunately, some hardware manufacturers don t like to disclose how their hardware works, because they want to protect their trade secrets This makes it impossible for them to release open source drivers, because such drivers would expose exactly how the hardware operates.

The examples so far have shown the aggregate functions applied to a whole table, but they can also be applied to the result of a query. For example, we could find the average handicap of women or of junior members by adding an appropriate WHERE clause, as in Listing 8-14.

When you enter information, such as the default gateway, from the command line, it will be lost the next time you reboot your server. To make sure that the information remains after a reboot, store it in the /etc/network/interfaces file. This file is read every time the network is activated. The entry used in this file to store the default route isn t complex: gateway 192.168.1.254