1. By Umesh ks

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

3. Version 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

4. 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

5. 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

6. ATTRIB – specifies the attribute of file e.g. To view Attributes C:\>ATTRIB To set Attributes C:\ATTRIB +r trial.doc AttributeAction 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.

7. REN – renames a file e.g. C:\>ren *.doc *.txt C:\>ren tr3.doc tr2.doc DEL – deletes a file e.g. C:\>del *.txt MD – creates directory under a root or subdirectory e.g. C:\>md trial RD – removes a subdirectory (empty directory) e.g. C:\>rd trial

8. FORMAT – formats a disk e.g. C:\>FORMAT driveletter :/switches SwitchDescription /sTransfer the system files and make it bootable /qQuick format that saves time by skipping the surface scan procedure for error checking /uAn unconditional format that reformats a disk and does not save the information required for it to be unformatted later