EXPLAIN ABOUT OPERATING SYSTEM

                             OPERATING SYSTEM

 “An operating system is  a software, or a series of programs, which performs various types of functions in order to manage and organize files.”

Operating system can be classified as follows:

1)      Multi-user  Allows two or more users to run programs at the same time.

2)      Multi –tasking Allows more then one program on more than one CPU.

3)      Multi-processing Supports running a program on more than one CPU.

4)      Multi-threading Allows different parts of a single program to run concurrently.

5)      Real-time Responds to input instantly. General purpousse operating system, such as DOS and UNIX are not real-time.

MS-DOS
·         The term DOS stands for Disk Operating System.
·         It is the microsoft operating system,it is developed by Microsoft for micro computers.
·         MS-DOS was writtten by “Tim patterson” in 1981 Microsoft.
·         In DOS,one has to key in the commands on prompt. Promt is placed where commands are issued. It may look like
    C:/>
    or
   C:/WINDOWS/>
 The mark (-) is the cursor which indicates that the command can be typed over here.this courser  keeps on blinking on the screen.

       SYSTEM FILES
             In computing, a system file is a method for storing and organizing computer files and the data, they contain to make it easy to find and access them.
         i.            DOS software consists of many files, which are loaded into the main memory from the secondary storage devices, so as to load the OS in the computer.
       ii.            It involes of loading of there essential files of DOS, ie, MSIO.SYS, MSDOD.SYS and COMMAND.COM in the main memory of the computer.
      iii.            Booting up is a step-by-step process that undergoes many steps to load the files.
  
       FEATURES OF DOS

v  DOS is not case sensitive,ie, DIR and dir aare treated as the same.

v  The file name are restricted to 8 characters only.

v  It does not support space entries in the file name.

     INERNAL COMMANDS

Ø  It can be directly excuated.

Ø  These commands are loaded in the primary memory of the computer and can be excuate as 
       and when required in DOS

Ø  For these commands, the specifications are available within the COMMAND.COM file.

CLS   it allows the user to clear the screen completely of all contents and leaves only a prompt.
Syntax C:\> CLS

DATE it is used to check the system date and modify it.
Syntax C:\> DATE
             C:/> DATE mm-dd-yy

TIME it displays the current time of the system
Syntax C:/> TIME
             C:/> TIME hh:mm:ss

WILD CARDS

a.       When more than one file isto be used from a directory, wild cards characters can be used

b.      These character can occupy that position.
Example : DIR*.TXT or dir*.txt
Here * is used to represent any name as the primary name and extension as TXT

BATCH FILES
         In DOS, a batch file is a text file with a series of commands intended to be excuated by the command interpreter.
    The file conaing the commands always has the extension as.BAT and be directly excuated as an external command.

Example:
     
        C:/> copy con frist .bat
        CLS
        DATE
        TIME  
        DIR
      ^Z

      The batch file is created.
EXPLAIN ABOUT OPERATING SYSTEM EXPLAIN ABOUT OPERATING SYSTEM Reviewed by Honey on 19:51:00 Rating: 5

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