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D O S. Disk Operating System. What is an Operating System?. A set of programs (called commands) that tell the computer how to make all its hardware work It is always running in the background, no matter what task you are using your computer for at any given time. An Operating System….

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d o s

D O S

Disk Operating System

what is an operating system
What is an Operating System?
  • A set of programs (called commands) that tell the computer how to make all its hardware work
  • It is always running in the background, no matter what task you are using your computer for at any given time
an operating system
An Operating System…
  • Recognizes messages (input) coming from the keyboard or mouse
  • Sends messages (output) to the video screen or the printer
  • Controls any additional devices (printers, modems, etc) you have attached to your computer

major components of any os
Major Components of Any OS
  • Input/Output Interface
    • What the user sees and interacts with
    • Text based or graphical user interface (GUI) icons
  • File Management System
    • Organizes program files
  • Command Processor
    • Works with program files and is the core of the operating system

A-M

dos disk operating system
DOS – Disk Operating System
  • DOS can refer to any operating system, but most often used to mean MS-DOS
  • Originally developed by Microsoft for IBM in the early 1980’s and became the standard operating system for the PC world
  • Before using your computer, DOS needs to be up and running
dos input output interface
DOS Input/Output Interface
  • Text based
    • Commands are entered by typing combinations of letters and symbols on a command line
    • Example: C:\>copy a: c:
  • Does not use icons or the mouse

dos prompt screen

_

MS-DOS Prompt



X

Auto

A

Microsoft ® Windows 98

© Copyright Microsoft Corp. 1981-1998.

C:\>

DOS Prompt Screen

C = Designates the disk drive being accessed.

\ = Represents a level in the hierarchy of the file structure

> = Symbolizes the prompt itself

basic dos directory commands

_

MS-DOS Prompt



X

Auto

A

Microsoft ® Windows 98

© Copyright Microsoft Corp. 1981-1998.

C:\>dir

C:\>md DOSCLASS

C:\>cd DOSCLASS

C:\DOSCLASS>cd ..

C:\>rd DOSCLASS

Basic DOS Directory Commands
  • Views the contents of the root directory
  • Makes a new directory called DOSCLASS
  • Changes to the DOSCLASS directory
  • Changes the directory back to the previous one. Notice how the prompt changes when you change the directory
  • Removes the DOSCLASS directory. All files in the directory must be removed before removing the directory.
basic dos file commands

_

MS-DOS Prompt



X

Auto

A

Microsoft ® Windows 98

© Copyright Microsoft Corp. 1981-1998.

C:\>ren list.wp mylist.wp

C:\>copy animals.doc dogs.doc

C:\>copy animals.doc a:

C:\>del a:\animals.doc

C:\>type animals.doc

Basic DOS File Commands
  • Changes a file name from list to mylist
  • Duplicate a file, commonly done to create a backup copy of your original file
  • Creates an exact copy of the animal file on a different disk
  • Deletes the animal file
  • Displays a file on the computer screen so you can read it
dos file names
DOS File Names
  • All filenames must follow a pattern
    • Up to 8 characters in the descriptive part
    • Followed by a “.” with up to three more characters referred to as the extension.
    • Example: animal.doc
  • File names can be entered in upper or lowercase letters
  • You cannot use the following characters in a filename
    • . / \ [ ] * < > = , ; : “ | + ?
common file extensions
Common File Extensions
  • TXT ---------------- A text file
  • EXE ---------------- An executable file
  • SYS ---------------- A system file
  • COM --------------- A command program
  • BAT ---------------- A batch file
dos to windows
DOS to Windows
  • Many people find typing commands too technical
  • Windows created with icons to make file management easier
  • DOS is needed to run in the background of Windows
  • Newer operating systems, such as Windows NT, do not rely on DOS, although they can execute DOS-based programs.
  • It is expected that as the newer operating systems gain market share, DOS will eventually disappear.
dos web sites resources
DOS Web Sites Resources
  • www.pcwebopaedia.com/disk_operating_system.htm
  • w3.ag.uiuc.edu/AIM/CCSOcourses/DOS-rev.html
  • www.computerhope.com/msdos.htm
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