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This article mainly introduces whether unix is an application software or not. It is very detailed and has a certain reference value. Interested friends must finish reading it!

Unix is not an application. Unix is a time-sharing operating system that appeared in the early 1970s. It can be used not only as a network operating system, but also as a stand-alone operating system. Unix operating system is mainly used in engineering applications, scientific computing and other fields.

Unix is an operating system that appeared in the early 1970s. It can be used not only as a network operating system, but also as a stand-alone operating system. Unix has been widely used as a development platform and desktop operating system. At present, it is mainly used in engineering applications, scientific computing and other fields.

UNIX system is a time-sharing system. The earliest UNIX system came out in 1970. Previously, there were only operating systems for batch jobs, which were too slow for users who needed an immediate response. In the late 1960s, both Kenneth Thompson and Dennis Ritchie participated in the design of the interactive time-sharing system Multics, and the tool used to develop the system was CTSS. These two systems have had a significant impact on the development of the operating system. On this basis, in the process of refining and developing the existing technology at that time, K.Thompson developed the UNIX system on a minicomputer in 1969 and put it into operation in 1970.

UNIX system plays an important role in the history of computer operating system. It does inherit and transform the existing technology meticulously, cautiously and selectively, and it has developed in the overall design concept of the operating system, which makes it so successful. The main characteristics of UNIX system are shown in the following aspects:

The main contents are as follows: (1) the structure of UNIX system is divided into two parts: core program (kernel) and peripheral program (shell), and the two are organically integrated into a whole. The core part undertakes the functions of each module within the system, that is, processor and process management, storage management, device management and file system. The core program is characterized by well-designed, concise and capable, only needs to occupy a small amount of space and resident memory, in order to ensure the efficient operation of the system. The peripheral part includes the user interface of the system, the system utility and the application program, and the user uses the computer through the peripheral program.

(2) the UNIX system provides a good user interface and has the characteristics of easy to use, complete functions, clear and flexible, easy to expand and modify. The use of UNIX system has two forms: one is the operation command, namely Shell language, which is the interface through which the user can interact with the system through the terminal; the other is the user program-oriented interface, which provides services to users not only in assembly language, but also in C language.

(3) the file system of UNIX system is a tree structure. It consists of a basic file system and a number of detachable sub-file systems, which can not only expand the file storage space, but also conducive to security and confidentiality.

(4) the UNIX system unifies the processing of files, file directories and devices. It accesses files sequentially or randomly as character streams regardless of any record, and makes files, file directories and devices have the same syntax and semantics and the same protection mechanism, which not only simplifies the system design, but also facilitates users' use.

(5) the UNIX system contains very rich language processing programs, utility programs and tool software for developing software, which provides users with a quite complete software development environment.

(6) most of the programs in UNIX system are programmed in C language, and only about 5% of the programs are programmed in assembly language. C language is a high-level programming language, which makes the UNIX system easy to understand, modify and expand, and has a very good portability.

(7) the UNIX system also provides a simple communication function between processes.

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