DOS or MSDOS

Disk operating system or Microsoft Disk Operating System - basically it is an OS which works as an intermediary between computer hardware and user. MSDOS consist of four main programs.

IO.Sys, Boot Record, Command.Com,MSDOS.Sys. it is single user single tasking operating system. there is no use of mouse and only supported command means it was CUI or CLI based OS.

DOS Commands

• Internal Command
• External Command

Internal commands

which are loaded in to computer's memory during booting process automatically.

Some commands

cd- for changing directory

md or mkdir- for making directory.

cls- for clearing screen.

dir- for displaying the list of dir and subdir.

cd..- for coming one dir back.

F6 and Ctrl+z- is used for saving file.

copy con- it is used for creating file.

date - for displaying current time.

time - for displaying current time.

ver- for displaying current version.

ren- for renaming file or directory.

rd- for deleting empty directory.

External Commands

it is disk resident commands like harddisk, floppy, cd, dvd etc.

Move- for moving directory or file one place to another

Mem- for displaying total available memory.

Deltree- it will delete all files and directories containing sub directories and hidden files.

Edit- it is dos editor it is used for editing text files.

Format- for formatting disk.

Xcopy- this is for copying files directories and sub directories .

Note

• it is not case sensitive .
• you can not keep keep space between two files names
• DOS is Boss of all operating systems.