ITFT - DOS - Disk Operating System
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Transcript of ITFT - DOS - Disk Operating System
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1) Dos stands for DISK OPERATING SYSTEM.
2) It is the most popular operating system which was developed by Microsoft Corporation of USA in early 1981.
3) It provides a set of commands that enables you to access or manipulate information on your disks, as well as simply interacts with your computer.
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MS-DOS is divided into three layers are:-
1) BIOS(Basic Input Output System)
2) Dos Kernel
3) The Command Processor (Shell)
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This part of Dos is
supplied by the individual manufacturer of the
system. It contain a set of programs called
drivers that manage the following devices
attached to a computer system like screen,
printer, secondary storage devices, system
clock,
block device - a driver that is used for primary
bootstrap.
One part of BIOS is stored in a
read only memory(ROM).The remaining part of
BIOS is stored in a system file called IO.SYS file
resides on the boot disk.
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It is a set of programs called system functions which provide the following services :
a) File Management.
b) Memory Management.
c) Character Device (INPUT/OUTPUT)
d) Access to real time clock.
e) Basic networking function
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The shell or command processor is
an interface between the user and the dos. It is
contained processor is an interface between the
user & the dos. It contained in a file called
command.com
It provides a standard set of
commands that gives users access to file-
management, device management, configuration
& miscellaneous functions, such as maintaining
and verifying the time and miscellaneous
functions, such as maintaining and verifying the
time and date.
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1) Internal commands
2) External commands
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Internal commands are built into
the operating system as part of a file
called COMMAND.COM (or, on a 2000 or
XP machine CMD.EXE) . They are loaded
into memory whenever you switch on your
computer. When you type an internal
command, MS-DOS performs it
immediately.
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• DIR
• TYPE
• COPY
• REN
• MD
• DEL
• CD
• RD
• DATE
• TIME
• VER
• VOL
• CLS
• PROMPT
• EXIT
• COPY CON
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Files with extension COM or
EXE are external commands. Because
these commands are files, they are not
built into the operating system ( these are
the commands that alter between
versions of MS-DOS).
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COPY
RESTORE
ATTRIB
LABEL
BACKUP
MODE
SORT
CHKDSK
SCANDISK
FIND
DELTREE
XCOPY
REPLACE
DISKCOPY
SYS
FORMAT
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DATE COMMAND –
This command is used to display the
current date on the screen. we can also set the
date by using this command.
Syntax :-
c:\> date
Example :-
c:\> date [ dd/mm/yy]
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This command is used to see the
current time or used to set the time.
Syntax :-
c:\> Time
Example :-
c:\> Time [hh/mm/ss]
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This command is used to clear the
screen.
Syntax :-
c:\> cls
Example :-
c:\> cls
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This command is used to see all or
specified files on the specified drive.
Syntax :-
c:\>dir
or
c:\>dir[drive:][pathname]
or
c:\>dir[drive:][pathname][/p][/w]
Example -
c:\>dir d/p
/P - Display page wise listings of directory.
/W – Display widthwise listing of directory.
/B – Displays a bare filename listing without size,date &
time information.
/L – Displays files information in lowercase.
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Type command :-
Display the contents of specified file.
Syntax :-
c:\>type <filename>
or
c:\>type[drive:]<filename>
Example -
c:\>type A: try.txt