vb.net barcode library PART 7 in Java

Generate USS Code 39 in Java PART 7

PART 7
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Keeping Your System Running
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Installing and Removing Software
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ne of the fun things about running any operating system is the ability to expand it to add in new software over time to improve your workflow or just for entertainment value. Linux is blessed in this regard, because tens of thousands of software titles are available to meet just about every need. However, even if you ve tracked down the ideal software title, there s just one barrier to overcome: actually installing it on your system. Installing software under Ubuntu isn t the same as with Windows. Users are afforded a lot more power over what happens to their systems, but this comes at the expense of needing to take a little time to understand the terminology and techniques. That is what you ll learn in this chapter.
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Software Installation Basics
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Installing programs on Windows is relatively easy. If you wish to use the WinZip archive tool, for example, you can browse to the web site, download the installer .exe file, and install the software. Although you might not realize it, a lot of work goes into making this seemingly simple task possible. Once the original software has been created by the programmers, it must be made into a form that you, the end user, can deal with. The first thing to happen is that the software is compiled. This is the process of turning the source code created by programmers into an actual file (or set of files) that can be used on a daily basis. On most systems, compiling source code involves a lot of number crunching. This takes time hours, in some cases and this is why it isn t normal practice to compile the source code every time you want to run the program. Once the program files have been compiled, there needs to be a way they can be installed on various systems and easily transported across the Internet. This is where packaging comes into the equation. Programs usually consist of many files. To make each program file individually available would mean that some are sure to get lost or corrupted, and the program wouldn t work. Therefore, the files are usually combined into a single archive file. In addition, third-party system files are added to ensure compatibility on all computers
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CHAPTER 28 INSTALLING A ND REM OVING SOFTWARE
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and an extra program, called an installer, is added so that users can quickly get the files onto their systems. All of this means that, to be able to install a program like WinZip on Windows, all you need to do is download the installer .exe file and run it once. No more work is necessary. Linux is a little more involved, largely because it never assumes that users want their environment to be simplistic and with limited options. However, most Linux distributions still embrace the paradigm of packaging software into a single, easily transported file. We will explain how software packages work in Ubuntu in a moment, but first it s necessary to understand other typical software distribution file formats used in the world of Linux.
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Formats of Linux Installation Files
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If you visit the web site of a particular Linux application, you may find that it s available to download in a number of different formats. The program will almost certainly be available as source code the original human-readable text that the developer created. But it might also be available as a binary or a package file.
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Tip Linux isn t the only operating system for which open-source programs are created and used. There
are open-source projects for both Windows and Apple Macintosh, many of which are hosted at the http:// sourceforge.net web site. Many other, less widely used operating systems also rely on open-source software to a greater or lesser extent.
Here are the formats by which Linux software is normally distributed: Source code: Programmers write their software in various programming languages, such as C and C++, and the code that results is known as source code. To make source code usable, it must be compiled into a binary. Because the cornerstone of the Linux philosophy is the sharing of source code, you ll almost always find the source code of a program available at the developer s web site. You can then download and compile this on your own system (or, if you re so inclined, study the source code to further your understanding). Although compiling source code isn t very hard to do, it s more convenient to download either a binary version of the program or a package. Binary files: You might find ready-made binary files are available at the developer s web site. In other words, the programmer has taken his or her own source code and, as a service to users of the program, compiled it so that it s ready for use as soon as it s downloaded. For example, this is how Linux versions of the Mozilla Foundation software, like Thunderbird and Firefox, are currently distributed if you download them directly from www.mozilla.com. Sometimes binary files come with scripts to help you install them. However, in most cases, you simply place the files in a convenient location on your hard disk, and then run them from there.
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