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Dos Os: 2. Types of DOS Commands

DOS (Disk Operating System) was the first operating system used with PCs. It was designed for early IBM computers to manage hard disks and floppy disks. DOS used text-based commands instead of a graphical user interface. There are two types of DOS commands: internal commands that are built into DOS and external commands that are separate program files. The document then lists and describes some common DOS commands for directories, file management, and general system tasks. It also notes that users could get help for DOS commands by typing "help" followed by the command name.

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Manisha Vipul Sethi
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70 views1 page

Dos Os: 2. Types of DOS Commands

DOS (Disk Operating System) was the first operating system used with PCs. It was designed for early IBM computers to manage hard disks and floppy disks. DOS used text-based commands instead of a graphical user interface. There are two types of DOS commands: internal commands that are built into DOS and external commands that are separate program files. The document then lists and describes some common DOS commands for directories, file management, and general system tasks. It also notes that users could get help for DOS commands by typing "help" followed by the command name.

Uploaded by

Manisha Vipul Sethi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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DOS OS

 The DOS as OS. DOS is designed for the early IBM XT (COMPATIBLE X 86 PROCESSORS). DOS (Disk Operating
System) is the first operating system used with the PC.The keys and specific characters of DOS.DOS work in text mode
using a prompt: order must be known by user, they are not very complex it includes related English word. The graphical
interface using the mouse came later with an additional layer (window 2.0,3.0,3.1,3.11, workgroup). DOS is initially designed
to manage hard disk and floppy disk as well as their use for backup and recovery of files .Some special commands are used
by DOS. ...
 2. Types of DOS commands
 Any instruction given to the computer to perform a specific task is called command. The DOS has several
commands, each for a particular task and these are stored in DOS directory on the disk. The commands are
of two types :
 (a)Internal Commands : These are in built commands of MS-DOS i.e. these are stored in Command
interpreter file (COMMAND.COM). These commands reside in the memory as long as the machine is at he
system prompt(C:\>) level. To use these commands no extra /external file is required. E.g. DATE, TIME,
DIR, VER etc.
 (b) External commands : These are separate program (.com) files that reside in DOS directory and when
executed behave like commands. An external command has predefined syntax. for e.g. HELP, DOSKEY,
BACKUP, RESTORE, FORMAT etc.
 13. BASIC DOS COMMANDS :
 a) Directory Commands :
 DIR : To list all or specific files of any directory on a specified disk.
 MD : To make directory or subdirectory on a specified disk/drive.
 CD or CHDIR : Change DOS current working directory to specified directory on specified disk or to check
for the current directory on the specified or default drive.
 RMDIR or RD : Removes a specified sub-directory only when it is empty. This command cannot remove
root directory (C:\) or current working directory.
 TREE : Displays all of the directory paths found on the specified drive.
 PATH : Sets a sequential search path for the executables files, if the same are not available in the current
directory.
 SUBST : Substitutes a string alias for the pathname and creates a virtual drive.
 b) File Management Commands :
 COPY : Copies one or more files from source disk/drive to the specified disk/drive.
 XCOPY : Copies files and directories, including lower-level directories if they exists.
 DEL : Removes specified files from specified disk/drive.
 REN : Changes the name of a file(Renaming).
 ATTRIB : Sets or shows file attributes (read, write, hidden, Archive).
 BACKUP : Stores or back up one or more files/directories from source disk/drive to other destination
disk/drive.
 RESTORE : Restores files that were backed up using BACKUP command.
 EDIT : Provides a full screen editor to create or edit a text file.
 FORMAT : Formats a disk/drive for data storage and use.
 c) General Commands :
 TIME : sets or displays the system time.
 DATE : Sets or displays system date.
 TYPE : Displays the contents of at the specified file.
 PROMPT : Customizes the DOS command prompt.
 If a users requires help on any DOS commands he/she may type help and command name at the command
prompt.
 them on the desktop.

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