(N23) Operating System part1 What is OS, Kernel and Shell, Types of OS - SOS, NOS, SUST,SUMT,MUMT
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What is an Operating System?
An Operating system (OS) is a software which acts as an interface between the end user and computer hardware.
Every computer must have at least one OS to run other programs.
An application like Chrome, MS Word, Games, etc needs some environment in which it will run and perform its task.
The OS helps you to communicate with the computer without knowing how to speak the computer's language.
It is not possible for the user to use any computer or mobile device without having an operating system.
OS Architecture
Kernel
-interacts with Hardware
Kernel Manages:
-Hardware management
-Disk Management
-Process management
-Network management
-Memory Management
Shell
-Interacts with user
-provide user interface
-runs applications
Linux/Unix:
-*Bourne Again Shell – BASH
-Bourne Shell – Sh
-tsh
-csh
-ksh
User Interface:
CLI – Command Line Interface
GUI – Graphical User Interface
TUI – Text Based or Terminal Based User Interface
Types OS:
SOS – Simple Operating System: Desktop OS: MS DOS, Windows XP, 7 , 10
NOS – Network Operating System:Server OS: Win Server 2019,2016, Linux/Unix
User and Task – Type of OSs
SUST: Single user Single Task: MS DOS
SUMT: Single User Multi Task: Windows XP,7, 10..Win server 2019..
MUMT: Multi User Multi Task: Unix/Linux
Real-time operating system – Any thing that is Automated (RLINIX)
Distributed OS
Mobile Operating System – Android ,IOS, Symbian, Tizen, Black Berry , Windows Phone
Desktop OS: Application, Games, Data processing, Multimedia, web browsing, programming, Playing –Audio, Video, it’s a Client PC or End user Device
Server OS: Support Server Applications, Built in Server features
Type of Server:
DHCP SERVER
DNS SERVER
VPN SERVER
WEB SERVER – Application Server(Middleware Server)
FILE SERVER
Mail Server
Authentication Server – ADDS
Proxy Server
Remote Desktop Server
Deployment Server
Database Server
*Server provide service to Clients
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