Operating System Tutorial

Operating System Tutorial Types of Operating System Evolution of Operating System Functions of Operating System Operating System Properties Operating System Services Components of Operating System Needs of the Operating System

Operating Systems

Linux Operating System Unix Operating System Ubuntu Operating System Chrome Operating Systems Fedora Operating System MAC Operating System MS Windows Operating System Solaris Operating System Cooperative Operating System CorelDRAW Operating System CentOS FreeBSD Operating Systems Batch Operating System MS-DOS Operating System Commercial Mobile Operating Systems


Difference Between Multi-programming and Multitasking Difference between C-LOOK and C-SCAN Difference between Rotational Latency and Disk Assess Time Trap vs Interrupt Difference between C-SCAN and SSTF Difference between SCAN and FCFS Difference between Seek Time and Disk Access Time Difference between SSTF and LOOK Difference between Process and Program in the Operating System Difference between Protection and Security in Operating System

How To

How to implement Monitors using Semaphores How to Install a Different Operating System on a PC


What is Kernel and Types of Kernel What is DOS Operating System What is Thread and Types of Thread What is Process Scheduler and Process Queue What is Context Switching What is CPU Scheduling What is Producer-Consumer Problem What is Semaphore in Operating System Monitors in Operating System What is Deadlock What is Paging and Segmentation What is Demand Paging What is Virtual Memory What is a Long term Scheduler What is Page Replacement in Operating System What is BSR Mode What is Convoy Effect What is Job Sequencing in Operating System Why is it critical for the Scheduler to distinguish between I/O-bound and CPU-bound programs Why is there a Need for an Operating System


Process Management Process State Scheduling Algorithm FCFS (First-come-First-Serve) Scheduling SJF (Shortest Job First) Scheduling Round-Robin CPU Scheduling Priority Based Scheduling HRRN (Highest Response Ratio Next) Scheduling Process Synchronization Lock Variable Mechanism TSL Mechanism Turn Variable Mechanism Interested Variable Mechanism Deadlock Avoidance Strategies for Handling Deadlock Deadlock Prevention Deadlock Detection and Recovery Resource Allocation Graph Banker’s Algorithm in Operating System Fixed Partitioning and Dynamic Partitioning Partitioning Algorithms Disk Scheduling Algorithms FCFS and SSTF Disk Scheduling Algorithm SCAN and C-SCAN Disk Scheduling Algorithm Look and C-Look Disk Scheduling Algorithm File in Operating System File Access Methods in Operating System File Allocation Method Directory Structure in Operating System N-Step-SCAN Disk Scheduling Feedback Queue in Operating System Contiguous Memory Allocation in Operating System Real-time Operating System Starvation in Operating System Thrashing in Operating System 5 Goals of Operating System Advantages of Operating System Advantages of UNIX Operating System Bit Vector in Operating System Booting Process in Operating System Can a Computer Run Without the Operating System Dining Philosophers Problem in Operating System Free Space Management in Operating System Inter Process Communication in Operating System Swapping in Operating System Memory Management in Operating System Multiprogramming Operating System Multitasking Operating Systems Multi-user Operating Systems Non-Contiguous Memory Allocation in Operating System Page Table in Operating System Process Scheduling in Operating System Segmentation in Operating System Simple Structure in Operating System Single-User Operating System Two Phase Locking Protocol Advantages and Disadvantages of Operating System Arithmetic operations in binary number system Assemblers in the operating system Bakery Algorithm in Operating System Benefits of Ubuntu Operating System CPU Scheduling Criteria in Operating System Critical Section in Operating System Device Management in Operating System Linux Scheduler in Operating System Long Term Scheduler in Operating System Mutex in Operating System Operating System Failure Peterson's Solution in Operating System Privileged and Non-Privileged Instructions in Operating System Swapping in Operating System Types of Operating System Zombie and Orphan Process in Operating System 62-bit operating system Advantages and Disadvantages of Batch Operating System Boot Block and Bad Block in Operating System Contiguous and Non - Contiguous Memory Allocation in Operating System Control and Distribution Systems in Operations Management Control Program in Operating System Convergent Technologies in Operating System Convoy Effect in Operating System Copy Operating Systems to SSD Core Components of Operating System Core of UNIX Operating System Correct Value to return to the Operating System Corrupted Operating System Cos is Smart Card Operating System Cosmos Operating Systems Examples Generation of Operating System Hardware Solution in Operating System Process Control Block in Operating System Function of Kernel in Operating System Operating System Layers History of Debian Operating Systems Branches and Architecture of Debian Operating Systems Features and Packages of Debian Operating Systems Installation of Operating System on a New PC Organizational Structure and Development in Debian Operating Systems User Interface in Operating System Types Of Memory in OS Operating System in Nokia Multilevel Paging in OS Memory Mapping Techniques in OS Memory Layout of a Process in Operating System Hardware Protection in Operating System Functions of File Management in Operating System Core of Linux Operating System Cache Replacement Policy in Operating System Cache Line and Cache Size in Operating System What is Memory Mapping? Difference Between Network Operating System And Distributed Operating System What is the difference between a Hard link and a Soft Link? Principles of Preemptive Scheduling Process Scheduling Algorithms What is NOS? What is the Interrupt I/O Process? What is Time Sharing OS What is process termination? What is Time-Sharing Operating System What is Batch File File system manipulation What is Message-passing Technique in OS Logical Clock in Distributed System

Advantages of UNIX Operating System

What is UNIX OS?

UNIX is a family of multitasking, multiuser operating systems that are used on a wide variety of computer platforms. It was developed in the late 1960s and early 1970s by a group of researchers including Ken Thompson and Dennis Ritchi at AT&T Bell Labs.  

UNIX is known for its portability, security, and reliability, as well as its ability to support multiple users and processes simultaneously. It has a modular design, which makes it easy to customize and extend, and it has a large ecosystem of software applications available for it.

There are many different versions of UNIX available, including commercial versions such as IBM's AIX and HP's HP-UX, as well as open source versions such as Linux and BSD.

Components of UNIX


The kernel is the central part of the UNIX operating system that controls all the other parts of the system and manages the hardware resources of the computer. It is responsible for things like scheduling tasks, managing memory, and handling input/output operations.


The shell is the interface between the user and the kernel. It is basically a command-line interface that allows the users to enter commands so as to receive output from the system. The shell interprets the commands that are entered by the user and sends them to the kernel so that they can be executed. There are different types of shells available for UNIX, each of which has its own features and syntax.

Some of the most commonly used shells are the Bourne shell (sh), the C shell (csh), and the Bourne-Again shell (bash).

Working of UNIX OS

In a UNIX-based operating system, the kernel is the central component that manages the system's resources and communicates with the hardware. It is responsible for managing processes, memory, and input/output (I/O) operations, as well as enforcing security by controlling access to the system's resources.

  • The kernel communicates with the system's hardware through device drivers, which are specialized programs that control specific hardware devices. The kernel also communicates with other software programs through system calls, which are requested for services or access to resources.
  • User programs and utilities, such as text editors and command line interpreters, run on top of the kernel and interact with it through system calls. These programs and utilities provide the interface that users interact with to perform tasks on the system.
  • In addition to the kernel and system programs, a UNIX-based operating system also includes a set of libraries, which are collections of pre-compiled code that can be used by multiple programs. This allows programs to share common functionality and reduces the amount of code that needs to be written and maintained.
  • Overall, the UNIX operating system is designed to be modular, flexible, and efficient, allowing it to support a wide range of hardware and software platforms and meet the needs of a variety of users.

Types of UNIX OS

There are many different flavours of UNIX, also known as UNIX-like operating systems. Some of the more well-known versions include:


This version of UNIX is the primary operating system used on Apple Macintosh computers.


This is a free and open-source UNIX-like operating system that is widely used on a variety of hardware platforms, including servers, desktops, and embedded devices.

Different types of UNIX available are:

This version of UNIX was developed by Sun Microsystems and is now owned by Oracle Corporation. It is primarily used on enterprise-level servers and workstations.


This is a version of UNIX developed by IBM for use on its Power Systems line of computers.


This is a version of UNIX developed by Hewlett-Packard for use on its HP 9000 series of computers.


BSD stands for Berkeley Software Distribution, and IS based on the original UNIX code developed at the University of California, Berkeley. There are several different versions of BSD, including FreeBSD, OpenBSD, and NetBSD.

Advantages of UNIX-based Operating System

There are several advantages to using a UNIX-based operating system, such as:


UNIX is designed to be portable, it means, it can be run on a variety of different hardware platforms. This makes it easy to move applications from one system to another.


UNIX systems have a strong focus on security, with features such as file permissions and access controls to help prevent unauthorized access to sensitive data.


UNIX systems are designed to be scalable, it means, they can handle a large number of users and processes without slowing down. This makes them well-suited for use in enterprise environments.


UNIX systems are known for their reliability and uptime, making them a popular choice for mission-critical applications.


UNIX systems offer a high degree of customizability, with a wide range of tools and utilities that allow users to tailor the system to their specific needs.


UNIX systems can easily communicate with other systems and share data, making them a good choice for environments where interoperability is important.

Large software ecosystem:

There is a large ecosystem of software available for UNIX, including applications for a wide range of purposes. This makes it easy to find tools and utilities to meet specific needs.