Unix operating system

Unix operating system-:

Unix  is a powerful computer Operating System who is control from multiple users at the same time. Unix was established in 1969 at AT&T Bell Labs by Ken Thompson and Dennis Ritchie.

Unix is a stable, multi-user and multi-tasking system for servers, desktops and laptops.Unix system have provide  a graphical user interface.GUI providing an easy environment.Unix is required for operations which aren’t covered by a graphical program, or for when there is no windows interface available.

The Unix operating system is a set of programs that work as a mediator both the  computer and the user.The computer programs that allocate the system resources and give the details of the computer’s internals is called the operating system or the kernel.

When Users communicate with the kernel through a program known as the shell. The shell is a command line interpreter. it translates commands entered by the user and converts them into a machine  language that is understand  by the kernel.

Type of Unix Operating system-: There are many different versions of Unix is available in the market these are the same but most popular version  of Unix are MacOsX, Sun Solaris and  Gnu/Linux.

Unix are using for different purpose as like if we are using for study or work we can use it.

The Unix operating system-: There are has three main part of Unix operating system ..

  •  Kernel
  •  Shell
  •  Programs

Kernel-: It is a hub of Unix operating system. Kernel is  allocates time to the process . It also allocated  memory to programs and handles the files store. After the process it’s give the response to system calls.

Both are work together means  shell and the kernel work together.

Shell-:  Shell providing an interface to the Unix System. It gathers input from the User and executes programs based on that input. When a program end after  executing the programme it gives the output.

Shell is a free environment platform which providing  commands, programs, and shell scripts. There are different types  of a shell as like different type of operating systems. Each type of shell has its own set of recognized commands and functions.

Types of shell -:  There are two type shell

Bourne shell − When we are using a Bourne-type Shell the $ character is the default prompt. This $ sign is use for command.

C shell − When we are  using a C-type shell, the % character is the default prompt. This % sign is use for command.

Programmes-: In using graphical user interfaces programming has been forgotten.Unix was developed for a  software development platform .These programs were created for various other platforms.

Unix was written  in the C programming language. As a result, Unix has always been closely tied to C and then later C++. Most other languages are available on Unix, but systems programming is still primarily a C/C++ kind of thing.

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