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UNIX is an operating system consisting of a set of programs which is helpful for the computer in its working. It is a stable, multi-user and multi tasking operating system. It has Graphical User Interface capability ,command language , scripting language.
UNIX OS is composed of 6 components Kernel ,Shell,Programs, Development environment,Commands ,Documentation
System structure of the UNIX operating System mainly consists of three modes which are described below:
- User Mode: It is further consists of two parts: Applications and Libraries.
- Kernel Mode: It is also further consists of the following: CPU Scheduling, Virtual Memory, Demand Paging, File System, Signals Terminal etc.
- Hardware: It is also involves the following: Physical memory, Memory controllers, Disk and tapes etc.
UNIX has involved some approaches like Users, Groups, Permissions and Network-Shared Resources built into its system. This approach is well understood and simple to implement.
- Users ,Username ,Password ,Default group ,Contact info ,Home directory, Default shell ,Groups ,Permissions ,Network-Shared Resources
A command interpreter that provides the interfaces between Unix Operating system and user is termed as Shell process. It acts as an environment in which a user can run their programs, shell scripts and commands. UNIX shell programming enables user to build their functions and use them when they needed.
Pthreads Synchronization is the advanced concept of UNIX which mainly shared memory, so there is need for synchronization.
Unix File System management utilities, disk management, Berkley Sockets API ,advanced filters, Client/server programming, Standard I/O vs System I/O, System V Interprocess Communication ,Files, Directories, and Printing ,UNIX Shell Environment ,Networking Commands ,UNIX File Information ,Data Backup
A broad ranges of UNIX products include Open Server ,UnixWare ,Open Server 6
Various Distributions of UNIX System include SCO UNIX, Solaris, MINIX, IRIX, Tru64, ULTRIX, Xenix etc.
Several useful features of the UNIX are mentioned below:
- Hierarchical directory structure
UNIX is an operating system that controls a computer system and its peripherals. Operating system acts as an interface between user and system. Unix is a multi tasking and multi user system which allows user to do more than one task. Unix has consists three main parts: The kernel ,The shell ,The programs.
The kernel is used to allocate the times and memory to programs. The shells acts as an interface between user and system. Unix consists large number of programs according to the user needs. Main characteristics of unix are as follows:
- Multi tasking
- Multi user
- Flexible and reliable
- Open source
- Shared libraries
It includes commands such as chgrp, cat, cd, chmod, cp, date, file, find, grep, head, In ,Is , more, pwd, tail, touch, rmdir, rm, mv, mkdir. These all commands are used to handle files and directories. Unix consists everything as a file or process. Process is a program that can be identified by unique process identifier. File is a collection of data. In unix, file system is arranged in hierarchical structure. Collection of file is known as directory. There are three types of files in UNIX that are Directories,Ordinary files andSpecial files
It is best for that situation where lot of power is required for database applications and computing.
In UNIX programming there are many shells such as c shell, Bourne shell and Korn shell which is highly programmable. In UNIX programming shell is the command line interpreter. Shell is the program or a command that interacts with the kernel. Any shell can be run easily by just typing its name.
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