tailieunhanh - Suse Linux 9.3 For Dummies- P3

Suse Linux For Dummies- P3:This part is all about getting you started on your way to a lasting relationship with SUSE Linux. Before you can begin your SUSE Linux experience, I spend a chapter explaining what SUSE Linux is and what you can do with SUSE Linux (pretty much anything you can do with a PC that runs Windows). | 10 Part I Getting to Know SUSE_ Memory Transient storage where programs are loaded and executed by the CPU Figure 1-1 A simplified view of a computer and how it runs computer programs. Central Processing Unit CPU The computer s brain the microprocessor that executes the instructions contained in the program loaded into memory User Disk Permanent storage where programs are loaded and data are stored in files The operating system is software that manages all the hardware and runs other software at your command. You the user communicate those commands by clicking menus and icons or by typing some cryptic text. Linux is an operating system as are UNIX Windows 98 Windows 2000 and Windows XP. The Linux operating system also called the Linux kernel is modeled after UNIX. The operating system is what gives a computer any computer its personality. For example you can run Windows 98 or Windows XP on a PC and on that same PC you can also install and run Linux. That means depending on which operating system is installed and running at any particular time the same PC can be a Windows 98 Windows XP or Linux system. The primary job of an operating system is to load software computer programs from the hard drive or other permanent storage into the memory and get the CPU to run those programs. Everything you do with your computer is possible because of the operating system so if the operating system somehow messes up the whole system freezes up. You know how infuriating it is when your favorite operating system maybe even the one that came with your PC suddenly calls it quits just as you were about to click the Send button after composing that long e-mail to your friend. You try the three-finger salute pressing Ctrl Alt Del but nothing happens. Then it s time to try the Reset button provided your computer s builders were wise enough to include one . Luckily that sort of thing almost never happens with Linux it has a reputation for