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Linux forms an open source bundle collectively known as LAMP, which is a free alternative to proprietary (and expensive) solutions And LAMP is not just for low-traffic web sites: the mighty Wikipedia runs on Linux on Ubuntu Linux, in fact12) Linux is also hard to beat when it comes to flexibility It not only runs huge servers hidden in datacenters; many Linux derivatives found their ways into the smartphone market, Google s Android being the most popular but not the only one (and there are plans to use it on more devices, such as TV sets) And after HP s acquisition of Palm in late April, 2010, it has plans to use WebOS, which uses the Linux kernel as well, as a platform for its Tablet PCs and connected mobile devices.

13 This flexibility is what allows Linux to be a serious contender many would say the perfect option in the netbook market When the first generation of netbooks came out, the concept was nothing short of a revolution Until that moment, PC manufacturers had thought that users would always be willing to spend money on ever-more powerful computers with a lot of unnecessary software Windows Vista was the logical conclusion of that line of thought: a bloated OS, hungry for hardware resources Microsoft seemed to hope that people would buy a new and expensive computer just to be able to run its latest OS, which was full of functionality many did not want or need What happened was just the opposite: to avoid having to do that, many stuck to Windows XP or turned to Linux.

An external command is a command that is somewhere on disk, and this is their main disadvantage: they need to be loaded first and that takes time Listing 7-2 is a shell script that, although rather simple, still includes all of the basic elements Listing 7-2 Example of a Simple Shell Script That Contains All Basic Elements #!/bin/bash # # This is just a friendly script It echoes "Hello World" to the person # who runs it # # Usage: hello # echo 'Hello World!' exit 0.

Listing 8-4. Return the Number of Members with No Value for Gender SELECT COUNT(*) FROM Member WHERE Gender IS NULL

And some even went one step further, by replacing big desktops and notebooks with the smaller netbooks The unthinkable had happened: people actually wanted less than what the market had been providing What they wanted was a good enough computer that allowed them to do their work, while being cheap enough to be affordable in a time of economic uncertainty Microsoft was startled It was obvious by then that Windows Vista was not designed for that kind of device, so it allowed netbook manufacturers to install Windows XP and wait for Windows 7 to save the day Now that Windows 7 is out, what netbooks have is an artificially reduced version of the Windows OS reduced not to accommodate the simpler hardware imprint, but to make you pay extra money if you want all the functionality Ubuntu Linux sees things differently.

Because it is free, it doesn t have to be limited for commercial purposes Because it needs fewer hardware resources to run, it is natively better suited to small netbooks, and can run more applications on them as a result And because it is relatively safe, it doesn t need antivirus software running constantly in the background, consuming valuable processor cycles and disk I/O on a computer with limited hardware resources..

In the example script, you can see some things happening. After the comment, the command echo is used to greet the user who runs the script. Notice that the text to be echoed to the screen is placed between single quotes. These are also called strong quotes, and they make sure that the shell does not actually interpret anything that appears between them. In this example, it s a good idea to use them because the exclamation mark has a special meaning for the shell. Also note that, after the successful termination of the script, the command exit 0 is used. This command generates the so-called exit status of the script: it tells the parent shell whether or not the script executed successfully. Normally, the exit status 0 is used to indicate that everything went well. If some problems were encountered executing the script, an exit status value of 1 can be used. Any other exit status can be used at the discretion of the programmer. Using more than just 0 and 1 as values for exit status can make troubleshooting much easier. Using an exit status is important in more complex shell script because, based on the success or failure of your script, you can decide that something else needs to happen.