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System Programs - YouTube
Channel: Neso Academy
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in this lecture we'll be studying about
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system programs in the previous lecture
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we studied about system calls and we saw
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how system calls work now in this
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lecture we'll be seeing what are system
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programs and what are they used for
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so an important aspect of a modern
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system is the collection of system
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programs so in order to understand what
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the system programs are and in order to
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understand where the system program
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resides in our computer system hierarchy
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let us look at the diagram of our
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computer system hierarchy that we
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discussed in the very first lecture of
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this lecture series so as we see this is
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a diagram of our computer system
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hierarchy that we discussed in the very
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first lecture of this lecture series so
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if we look at this we find that in the
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lowest level we have our computer
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hardware which comprises of resources
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like the CPU memory and input/output
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devices and just on top of that we have
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the operating system and on top of this
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operating system we have the system
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programs and on top of the system
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programs we have our application
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programs like the word processors
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spreadsheets compilers text editors web
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browsers and so on then we have the
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users here who are interacting with the
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system's so what we are going to discuss
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today is about this system programs so
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we see that system programs are just
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above the operating system now we will
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see what are the system programs and
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what are they useful and we'll also see
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some examples of system programs and we
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will also study how we can categorize
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our system programs into different
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categories based on the kind of task
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that they perform so system programs
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they provide a convenient environment
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for program development and execution so
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the system programs what they do is they
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are going to provide you with a
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particular environment which is
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convenient for program development and
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execution so you will understand this
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when we take the examples and some of
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them are simple user interface to system
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calls while others are considerably more
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complex now we will see how we can
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categorize these system programs into
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different categories based on the kind
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of task that they were
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so system programs can be divided into
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the following categories so we will see
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the categories one by one the first one
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being file management so the system
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programs that helps in managing your
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files they fall under the category of
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file management system programs for
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example they helps to create files
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delete files copy files rename print or
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dump files or list files and in
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generally we can say that they help in
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manipulating files and directories so
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the system programs that help in
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manipulating files and directories they
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fall under the category of file
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management system programs all right now
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let's see what is the next one so the
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next one is status information so the
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system programs that fall under this
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category are those system programs that
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ask the system for its status
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information like for example it can ask
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the system for the system's date and
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time it can ask for the amount of
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available memory or disk spaces and it
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can also ask for the number of users and
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also it can ask for other detail
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performance and also other complex
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informations like logging and debugging
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informations etc so all the system
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programs that are dealing with the
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status information of your system they
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fall under this category of status
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information system programs and then the
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next one is file modification so these
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are the system programs that helps in
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modifying your files so you may be
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thinking what is the difference between
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file management and file modification
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because we have just discussed the file
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management in the first point now file
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management they deal with the outer
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layer of your file that means like
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creating your files deleting your files
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renaming copying moving and so on but
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file modification it deals with
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modifying the inner content of your file
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alright so if you want to modify the
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inner content of your file for that you
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use the system programs which fall under
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the category of file modification so we
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have several text editors which may be
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available to create and modify
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the contents of files stored on disk or
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other storage devices and there may also
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be special commands to search contents
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of files or perform transformations of
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the text so we see that if you want to
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modify the contents of your file like
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modifying or transforming the text or
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anything like that for that we have the
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system programs which fall under this
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category of file modification which
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helps us to accomplish this task now
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coming to the next one
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the next one is programming language
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support so these are the system programs
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that provide you with programming
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language support so there are different
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programming languages like C C++ Java
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Visual Basic Perl and so on now your
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system may have to compile and run
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programs that are written in this kind
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of different languages so your system
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must have support for these programming
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languages otherwise it will not be able
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to compile or run this kind of programs
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so in order to give you support for
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these programming languages there are
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system programs that helps in providing
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you with this programming language
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support so there are things like
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compilers assemblers debuggers and
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interpreters for common programming
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languages such as this which are often
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provided to the user with the operating
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system so these things are provided
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usually with the operating system so
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that your system will be able to compile
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the codes that are written in these
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languages so that your system works
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flawlessly even if it have to compile
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some source code related to some
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programming languages so the programs
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which gives you the support for these
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programming languages they fall under
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this category of programming language
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support system programs now the next one
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is program loading and execution so in
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the previous point we saw that our
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programs were compiled and assembled
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using those system programs which fall
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under the programming language support
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category now after your program is
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compiled it has to be loaded and
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executed so in order to do that there
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are some system programs that allows you
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or helps you
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do that so those are the system programs
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that fall under this category of program
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loading and execution so it says once
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the program is assembled or compiled it
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must be loaded into memory and executed
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so once your compilation and assembly is
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complete you need to load that program
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to the memory so that it can be executed
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so the system may provide you different
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kind of loaders in order to accomplish
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this task like the absolute loaders
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relocatable orders linkage editors and
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overlay loaders and also sometimes
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debugging system for higher level
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languages or machine languages are
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needed as well so debugging means
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whenever there is a problem in your code
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or in anything you need to find out what
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is the problem and you need to solve
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that problem so that is what we mean by
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debugging and the program's responsible
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for this task is known as debuggers so
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debuggers also may be necessary so all
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these programs that helps in loading the
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programs and executing the programs they
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fall under this category of program
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loading and execution system program now
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coming to the last one we have
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communications so these are the system
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programs that helps in communications so
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even when we discuss our system calls we
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had the system calls that helped in
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communications so in the same way the
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system programs that helps in
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communication between processes or users
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or allows users to surf the web and so
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on these system programs they fall under
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this category of communications so these
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programs they provide the mechanism for
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creating virtual connections among
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processes users and computer systems and
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they also allow users to send messages
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to one another screens to browse
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webpages just an electronic mail
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messages that is your email and to log
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in remotely or to transfer files from
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one machine to another so we see that
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all the tasks that are related to
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communications there are the things that
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we are talking about here so the system
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programs that help you in this
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communication processes they are the
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ones that fall under this category of
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communications
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programs so these are the main
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catagories unto which you can divide
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your system programs based on the kind
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of tasks that you perform now apart from
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the system programs there are also other
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programs that are provided by the
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operating system in order to perform
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certain tasks so as I told you in
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addition to system programs most
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operating systems are supplied with
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programs that are useful in solving
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common problems or performing common
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operations so some examples of those are
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like your web browsers you have web
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browsers like Mozilla Firefox Google
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Chrome and all which helps you to browse
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the web so these web browsers may be
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provided with your operating system I'm
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not saying that specifically Mozilla
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Firefox and Google Chrome will be
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provided with your operating system but
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based on the operating system that you
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are using one or more of the web
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browsers may be provided along with it
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like for example in your Windows
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operating system you have your Internet
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Explorer that is provided with your
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Windows operating system so that you can
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browse your web using that browser so in
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the same way there are word processors
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so depending again depending on the kind
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of operating system that you use and
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kind of the office tools that is
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installed in your system you may have
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the word processors installed in your
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system which is used for processing your
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word documents like for example in
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Windows you have your Microsoft Word and
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if you are using Linux and if you are
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having Libre Office installed in it
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you have your libera office writer which
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is the word processing software or
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application in libre office and then you
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have spreadsheet programs like your
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Microsoft Excel in your windows and in
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libreoffice in Linux you may have the
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LibreOffice calc
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see ALC so those are spreadsheet
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programs and then you may have database
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systems so you can have database systems
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that helps in managing your databases so
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they also can be of different types like
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you have Oracle database MySQL database
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and so on and then you may have games
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for your entertainment purposes exit
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so these are some other programs that
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are provided along with the operating
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system for the users to perform certain
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tasks so keep in mind that these are not
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system programs but they are application
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programs so once again I repeat these
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are not system programs but these are
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application programs which are provided
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along with the operating system for the
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users to perform certain tasks all right
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so let us just have a quick recap of the
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system programs which was the main focus
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of this lecture so what were the
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categories of system programs that we
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discussed so the categories of system
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programs are we discussed in this
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lecture our file management status
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information file modification
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programming language support program
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loading and execution and communications
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so these are the categories into which
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we can divide our system programs so I
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hope this lecture was played to you
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thank you for watching and see you in
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the next one
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[Music]
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[Applause]
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[Music]
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