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Like UNIX, Linux can be generally divided into three major components: the kernel, the environment, and the file structure. The kernel is the core program that runs programs and manages hardware devices, such as disks and printers. The environment provides an interface for the user. It receives commands from the user and sends those commands to the kernel for execution. The file structure organizes the way files are stored on a storage device, such as a disk. Files are organized into directories. Each directory may contain any number of subdirectories, each holding files. Together, the kernel, the environment, and the file structure form the basic operating system structure. With these three, you can run programs, manage files, and interact with the system. An environment provides an interface between the kernel and the user. It can be described as an interpreter. Such an interface interprets commands entered by the user and sends them to the kernel. Linux provides several kinds of environments: desktops, window managers, and command line shells. Each user on a Linux system has his or her own user interface. Users can tailor their environments to their own special needs, whether they be shells, window managers, or desktops. In this sense, for the user, the operating system functions more as an operating environment, which the user can control. The shell interface is simple and usually consists of a prompt at which you type a command, and then press ENTER. In a sense, you are typing the command on a line; this line is often referred to as the command line. You will find that the commands entered on the command line can become quite complex. Over the years, several different kinds of shells have been developed and, currently, three major shells exist: Bourne, Korn, and C shell. The Bourne shell was developed at Bell Labs for System V. The C shell was developed for the BSD version of UNIX. The Korn shell is a further enhancement of the Bourne shell. Current versions of UNIX, including Linux, incorporate all three shells, enabling you to choose the one you prefer. However, Linux uses enhanced or public domain versions of these shells: the Bourne Again shell, the TC shell, and the Public Domain Korn shell. When you start your Linux system, you are placed in the Bourne Again shell, an updated version of the Bourne shell. From there, you can switch to other shells as you choose. As an alternative to a command line interface, Linux provides both desktops and window managers. These use GUIs based on the X Window System developed for UNIX by the Open
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Group consortium (www.opengroup.org). A window manager is a reduced version of a integrated desktop, supporting only window operation, but it still enables you to run any application. A desktop provides a complete GUI, much like Windows and the Mac. You have windows, icons, and menus, all managed through mouse controls. Currently, two desktops are freely available and both are included with most distributions of Linux: Gnome and KDE. In Linux, files are organized into directories, much as they are in Windows. The entire Linux file system is one large interconnected set of directories, each containing files. Some directories are standard directories reserved for system use. You can create your own directories for your own files, as well as easily move files from one directory to another. You can even move entire directories, and share directories and files with other users on your system. With Linux, you can also set permissions on directories and files, allowing others to access them or restricting access to you alone. The directories of each user are, in fact, ultimately connected to the directories of other users. Directories are organized into a hierarchical tree structure, beginning with an initial root directory. All other directories are ultimately derived from this first root directory.
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