Single User Operating System

By

Umesh ks

Introduction

• Dos is a single user operating system.• Its support the all operating system wizards• Support the disk scheduling.• File management• Network wizards.

DOS VersionVersion and Release Date

Features

MS-DOS 1.0 (Aug '81) Distributed on one floppy; required 8 KB of RAM

MS-DOS 1.1 (May '82) Supported 106 KB single-sided and 320 KB double sided disks

MS-DOS 2.0 (Mar ' 83) Supported hard disks, directories, background printing and additional device drivers

MS-DOS 3.0 (Aug '84) Supported hard disks greater than 10 MB and 1.2 MB floppies

MS-DOS 3.1 (Mar '85) Supported networks and file sharing

MS-DOS 3.2 (Jan '86) Supported 3.5" floppy disks drives

MS-DOS 3.3 (Apr '87) Provided new commands and international support

MS-DOS 4.0 (Feb '88) Supported hard disk partitions greater than 32MB; provided the MEM command and DOS shell

MS-DOS 5.0 (May '91) Provided extra memory management tools, Help, Undelete, Unformat, added task swapping to DOS Shell

MS-DOS 6.0 (Mar '93) MemMaker, multiple boot configurations, Windows utilities: Unformat, Undelete, Virus protection and Backup

MS-DOS 6.2 (Oct '93) Provided Scandisk

Features of DOS

• Command Prompt Interface Text-based interface Used for file and disk management and

program execution

• Utility Program Performs file and system management tasks

with help of utilities such as FORMAT, EDIT, MSD and SCANDISK

DOS File Management

• COPY – duplicates the files from one directory to another.

e.g. C:\>copy tr3.doc C:\trial\tr3.doc C:\copy tr3.doc C:\trial\tr2.txt

• MOVE – copies a file from one location to another and delete the same from earlier location

e.g. C:\move tr3.doc C:\trial

• ATTRIB – specifies the attribute of file

e.g. To view Attributes C:\>ATTRIB <filename>To set Attributes C:\ATTRIB +r trial.doc

Attribute Action

Read only (R)

File can be accessed by any program but it cannot be modified or deleted

Archive (A)

The file has changed since it was last archived using the BACKUP or XCOPY utilities

Hidden (H)

The file is hidden and can not be seen when a normal directory listing is done using DIR

System (S)

The file is used by DOS and should not be edited or deleted by users.

Rename The File • REN – renames a filee.g. C:\>ren *.doc *.txt C:\>ren tr3.doc tr2.doc

• DEL – deletes a filee.g. C:\>del *.txt

• MD – creates directory under a root or subdirectorye.g. C:\>md trial

• RD – removes a subdirectory (empty directory)e.g. C:\>rd trial

Format The disk• FORMAT – formats a disk

e.g. C:\>FORMAT driveletter :/switches

Switch Description

/s Transfer the system files and make it bootable

/q Quick format that saves time by skipping the surface scan procedure for error checking

/u An unconditional format that reformats a disk and does not save the information required for it to be unformatted later

Thank you