视频Operating Systems 1 - Introduction_操作系统教程_操作系统简介

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Hello,my name is Shaun

Today,I'm going explain the basics of operating system

so that you have an understanding of its desired purpose

we will be covering key concepts and definitions whilst briefly touching upon the essentials of operating systems

so what is an operating system

in simple terms

it is chief program that manages all of hardware and software

it has control of every process ,file section of memory and device

it is every important if it work as a middleman

making sure both software and hardware interact correctly

Windows,Mac OS,Linux and UNIX are the big operating system contenders and all have their own the advantage and or disadvantage

but they all base of the same concept

there are four essential managers of every operating system and they all work together like a team to get jobs completed

the operating system works as their boss and to make sure they are all working in harmony
the memory manger is in charge the main memory

it scans every request for memory spaces
and checks if it is valid

it allows allocation of memory spaces that are not taken up already

memory may need to be allocated to free up space for other request

process manager decides how to allocate the brain of the computer known as the central processing unit

it is necessary that the process manager keeps track of the status of each process

it has to handle jobs as they enter the system and manage each process that is associated with those jobs

the device manager monitors every device channel and control unit

it has to choose the most efficient way to allocate all of the system devices
that are connected to the computer

USB sticks printers and external hard drives are examples of this

the file manager

checks the every file that is on the system

this mean data file ,program file,compilers and installed applications

it sets permissions so that certain users can only see certain files

so when you log in to your guest account

you cannot browse through the administrator's files as you do not have the permission to do so

another manager worth mentioning is the network manager

this provides a way for users to share hardware and software resources while also controlling
the users access to them

so we now understand how it works under the hood

so how do we the user interact with the operating system

we rely on the use of a user interface this gives us a visual understanding of what

we are trying to do when we interact with the system

so when you click and hold a file to move it into a folder

you're making the managers work to carry out the request

in the next few tutorials

we will be digging deeper into managers and looking at how they work together

this has been Shaun

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