What is UNIX And Used For | Two Parts of UNIX Operating System

What is UNIX And Used For What is UNIX And Used For | Two Parts of UNIX Operating System I Hope You Like The What is UNIX And Used For Don't Forget To Share And Comment.



What is UNIX?


Unix is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, development starting in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others. 


What is UNIX Used For



Developer: Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna
Initial release date: 3 November 1971
License: Varies; some versions are proprietary, others are free/open-source software
Default user interface: Command-line interface and Graphical (X Window System)
Written in: C, Assembly language

During the design phase of Unix, programmers decided to model every high-level device as a file, because they believed the purpose of computation was a data transformation

What is UNIX Used For


For instance, printers were represented as a "file" at a known location — when data was copied to the file, it printed out. Other systems, to provide similar functionality, tended to virtualize devices at a lower level — that is, both devices and files would be instances of some lower level concept. Virtualizing the system at the file level allowed users to manipulate the entire system using their existing file management utilities and concepts, dramatically simplifying operation. 



As an extension of the same paradigm, Unix allows programmers to manipulate files using a series of small programs, using the concept of pipes, which allowed users to complete operations in stages, feeding a file through a chain of single-purpose tools. Although the end result was the same, using smaller programs in this way dramatically increased flexibility as well as ease of development and use, allowing the user to modify their workflow by adding or removing a program from the chain.

Two Parts of UNIX Operating System 


In the Unix model, the Operating System consists of two parts; 
  • first, the huge collection of utility programs that drive most operations, 
  • The other the kernel that runs the programs.


Under Unix, from a programming standpoint, the distinction between the two is fairly thin; the kernel is a program, running in supervisor mode, That acts as a program loader and supervisor for the small utility programs making up the rest of the system, and to provide locking and I/O services for these programs; beyond that, the kernel didn't intervene at all in userspace.

What is UNIX Used For


Over the years the computing model changed, and Unix's treatment of everything as a file or byte stream no longer was as universally applicable as it was before. Although a terminal could be treated as a file or a byte stream, which is printed to or read from, the same did not seem to be true for a graphical user interface. Networking posed another problem. Even if network communication can be compared to file access, the low-level packet-oriented architecture dealt with discrete chunks of data and not with whole files. As the capability of computers grew, Unix became increasingly cluttered with code. It is also because the modularity of the Unix kernel is extensively scalable. While kernels might have had 100,000 lines of code in the seventies and eighties, kernels of modern Unix successors like Linux have more than 13 million lines. 


Examples of this are the QNX




Modern Unix-derivatives are generally based on module-loading monolithic kernels. Examples of this are the QNX, a microkernel owned by BlackBerry, Linux kernel in its many distributions as well as the Berkeley software distribution variant kernels such as FreeBSD, DragonflyBSD, OpenBSD, NetBSD, and Mac OS X. Apart from these alternatives, amateur developers maintain an active operating system development community, populated by self-written hobby kernels which mostly end up sharing many features with Linux, FreeBSD, DragonflyBSD, OpenBSD or NetBSD kernels and/or is compatible with them.


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NEtechy: What is UNIX And Used For | Two Parts of UNIX Operating System
What is UNIX And Used For | Two Parts of UNIX Operating System
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