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Operating Systems and Linux
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An operating system is a program that manages computer hardware and software for the user. Operating systems were originally designed to perform repetitive hardware tasks. These tasks centered around managing files, running programs, and receiving commands from the user. You interact with an operating system through a user interface. This user interface allows the operating system to receive and interpret instructions sent by the user. You only need to send an instruction to the operating system to perform a task, such as reading a file or printing a document. An operating system's user interface can be as simple as entering commands on a line or as complex as selecting menus and icons on a desktop. An operating system also manages software applications. To perform different tasks, such as editing documents or performing calculations, you need specific software applications. An editor is an example of a software application that enables you to edit a document, making changes and adding new text. The editor itself is a program consisting of instructions to be executed by the computer. To use the program, it must first be loaded into computer memory, and then its instructions are executed. The operating system controls the loading and execution of all programs, including any software applications. When you want to use an editor, simply instruct the operating system to load the editor application and execute it. File management, program management, and user interaction are traditional features common to all operating systems. Linux, like all versions of UNIX, adds two more features. Linux is a multiuser and multitasking system. In a multitasking system, you can ask the system to perform several tasks at the same time. While one task is being done, you can work on another. For example, you can edit a file while another file is being printed. You do not have to wait for the other file to finish printing before you edit. In a multiuser system, several users can log in to the system at the same time, each interacting with the system through his or her own terminal. Operating systems were originally designed to support hardware efficiency. When computers were first developed, their capabilities were limited and the operating system had to make the most of them. In this respect, operating systems were designed with the hardware in mind, not the user. Operating systems tended to be rigid and inflexible, forcing the user to conform to the demands of hardware efficiency. Linux, on the other hand, is designed to be flexible, reflecting its UNIX roots. As a version of UNIX, Linux shares the same flexibility designed for UNIX, a flexibility stemming from UNIX's research origins. The UNIX operating system was developed by Ken Thompson at AT&T Bell Laboratories in the late 1960s and early 1970s. The UNIX system incorporated many new developments in operating system design. Originally, UNIX was designed as an operating system for researchers. One major goal was to create a system that could support the researchers' changing demands. To do this, Thompson had to design a system that could deal with many different kinds of tasks. Flexibility became more important than hardware efficiency. Like UNIX, Linux has the advantage of being able to deal with the variety of tasks any user may face. This flexibility allows Linux to be an operating system that is accessible to the user. The user is not confined to limited and rigid interactions with the operating system. Instead, the operating system is thought of as providing a set of highly effective tools available to the user.
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This user-oriented philosophy means you can configure and program the system to meet your specific needs. With Linux, the operating system becomes an operating environment.
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