List of DOS commands

From Wikipedia, the free encyclopedia

A partial list of the most common commands for Microsoft's MS-DOS operating system follows. In versions 5 and later only, the user can get help by typing HELP at the shell prompt. (Before version 6, the help displayed by this command is very basic and not interactive.) In the interactive help of versions 6 and later, square brackets indicate optional parameters, while italicized items should be replaced with specific values.

In DOS version 5 or later, to get help on a DOS command, at the DOS prompt, type /? after the command name. For example, to get help for the xcopy command, type the following at the DOS prompt:

xcopy /?

The operating system will execute the command and the /? parameter display a help page about itself, in this case xcopy. To view this help page, see the xcopy entry on this page.

In the list below, when a command can accept more than one filename, or a filename including wildcards (* and ?), it is said to accept a filespec parameter. Commands that can accept only a single filename are said to accept a filename parameter.

For most of the commands, the Unix equivalent is given. It should be noted that Unix commands typically provide ranges of functionality and flexibility that are not approached by the equivalent DOS command, so all comparisons are approximate. For example, the DOS commands copy and xcopy are said to be equivalent to the Unix cp command, but in reality cp has much greater power than copy, and a similar functionality to xcopy.

Also most of those commands are shared with other DOS'es like DR-DOS, Enhanced DR-DOS and FreeDOS, but there are some of them having syntax differences as well as several completely different commands.

More than 100 other commands are available in different releases of DOS, all of which are described in the last reference; the most useful not described here are call, debug, doskey, edit, for, goto, if, mode, pause, and subst.

[edit] Commands

[edit] append

(External)

Display or sets the search path for data files. DOS will search the specified path(s) if the file is not found in the current path. This had some creative uses, such as allowing non-CD based games to be run from the CD, with configuration/save files stored on the HD.

append ;
append [d:]path[;][d:]path[...]
append [/X:on|off][/E]

[edit] attrib

Change or view the attributes of one or more files. It defaults to displaying the attributes of all files in the current directory.

Options:

• To add an attribute attach a '+' in front of it.
• To remove an attribute attach a '-' in front of it
• Attributes include
  • R - Read-only
  • A - Archive
  • S - System
  • H - Hidden

attrib [+|-ahrs] [filespec]

Roughly equivalent to the Unix commands chattr and lsattr.

[edit] cd or chdir

Change current directory. Displays the current working directory when used without parameters

cd 

cd directory
chdir directory

Equivalent to the Unix command cd (with parameters), or pwd (without parameters). (cd .. changes to the parent directory.)

[edit] chkdsk

Verifies a hard disk or a floppy disk for file system integrity.

Options:

• /F : Fixes errors on the disk
• /V : Displays the full path and name of every file on the disk
• /P : Forces a full disk verification
• /R : Searches for defective sectors and recovers legible information (applies /F)

chkdsk drive [[path]filename] [/F] [/V]

Equivalent to the Unix command fsck

[edit] cls

Clears the screen.

cls

Equivalent to the Unix command clear.

[edit] copy

Copies files from one location to another. The destination defaults to the current directory. If multiple source files are indicated, the destination must be a directory, or an error will result.

copy filespec [destination]

Equivalent to the Unix command cp.

Files may be copied to devices (e.g. "copy file lpt1" would send the file to the printer on lpt1. "copy file con" would output to screen, which would be the same as type.

Most useful to note that "copy file.txt+file2.txt file_cat.txt" will concatenate the files and output them as file_cat.txt. Which is just like the "cat" command.

When using this command to concatenate files there are two switches to modify its behaviour:

copy /a alpha.txt + beta.txt gamma.txt

Text mode - which will copy the text content of the file, stopping when it reaches the EOF character.

copy /b alpha.mpg + beta.mpg gamma.mpg

Binary mode - which will concatenate files in their entirety, ignoring EOF characters.

Equivalent in RT-11/RSX-11/OpenVMS operating systems line is copy command.

[edit] copy device

copy device filename

In this usage, data is written from the given device to the file until the end-of-file character (ASCII character 26, which may be typed as ctrl-Z) is encountered. The most commonly used device is named con, which is short for "console"; thus, copy con filename would allow the user to type directly into a file, and press ctrl-Z when finished.

In Unix, this functionality is provided by the cat command. cat > filename (with ctrl+D to finish) would be equivalent to the DOS command copy con filename.

Equivalent in RT-11/RSX-11/OpenVMS operating systems line is copy command.

[edit] defrag

Defragments disk drive

defrag driveletter:

Analyses the fragmentation of a disk drive

defrag driveletter: -a -v

No Unix equivalent.

DR DOS equivalent was the diskopt command.

[edit] del or erase

[[Media::Deletes files.]]

del filename
erase filename

Equivalent to the Unix command rm.

Equivalint in RT-11/RSX-11/OpenVMS operating systems line is delete command which can be contracted to del.

[edit] deltree

Deletes a directory along with all of the files and subdirectories that it contains. Normally, it will ask for confirmation of such a drastic action.

deltree [/y] directory

The /y parameter, if present, tells the deltree command to carry out without first prompting for confirmation.

The deltree command is not included in recent Microsoft Windows operating systems. Deleting a non-empty directory in those versions of Windows where the command is not included, can be achieved by using the rmdir command as in the following example:

rmdir /s [/q] directory 

In Unix, the functionality of deltree is provided by the rm command with the parameter -r (or -rf for the /y switch).

[edit] dir

Lists the contents of a directory.

The dir command typed by itself, displays the disk's volume label and serial number; one directory or filename per line, including the filename extension, the file size in bytes, and the date and time the file was last modified; and the total number of files listed, their cumulative size, and the free space (in bytes) remaining on the disk. The command is one of the few commands that exist from the first versions of DOS.

dir [drive:][path][filename] [parameters]

Most commonly used parameters of dir include:

• /W : Displays the listing in wide format, with as many as five filenames or directory names on each line.
• /P : Pause at every page
• /S : Also look in subdirectories
• /Axx: Display files with the specified attributes only
• /Oxx: Modifies sort order
• /B : Uses bare format (no heading information or summary)
• > [drive:][path][filename] : To Store Result in a text file;(c:\dir > c:\fileList.txt)

Possible attributes for the A parameter are D (directories), R (read-only files), H (hidden files), A (files/directories with the archive bit on), and S (system files). The prefix - negates an attribute; attributes can be combined (e.g. /A:DA means directories with the archive bit on).

Possible sort orders are N (name), S (size), E (extension), D (date and time), A (last access date), and G (group directories first). The prefix - reverses the order.

The default parameters of dir can be set using the DIRCMD environment variable.

Equivalent to the Unix command ls (the option -l is "long" list format, it works the opposite way from /w.)

Equivalent in RT-11/RSX-11/OpenVMS operating systems line is directory command which can be contracted to dir.

[edit] echo

Prints its own arguments back out to the DOS equivalent of the standard output stream. Usually, this means directly to the screen, but the output of echo can be redirected like any other command. Often used in batch files to print text out to the user.

echo this is text              Outputs 'this is text'
echo.                          Outputs a blank line

Another important use of the echo command is to toggle echoing of commands on and off in batch files.

echo on               turns on echoing of commands
echo off              turns off echoing of commands

Traditionally batch files begin with the @echo off statement. This says to the interpreter that echoing of commands should be off during the whole execution of the batch file thus resulting in a "tidier" output. The @ symbol declares that this particular command (echo off) should also be executed without echo. For example the following 2 batch files are equivalent:

Batch1.bat:

@echo off
echo The files in your root directory:
dir /b /a-d c:\

Batch2.bat:

@echo The files in your root directory:
@dir /b /a-d c:\

Echo can be used to write to files directly from the console, by redirecting the output stream:

echo text > filename

Echo can also be used to append to files directly from the console, again by redirecting the output stream:

echo text >> filename

To type more than one line from the console into a file, use copy con (above).

Equivalent to the Unix command echo.

[edit] exe2bin

Converts an executable (.exe) file into a binary (.bin) file, which is a memory image of the program.

The size of the resident code and data sections combined in the input .exe file must be less than 64KB. The file must also have no stack segment.

[edit] exit

Exits the current command processor.

 EXIT

Exit also exists in Unix-shells.

[edit] fc

Compares two files or sets of files and displays the differences between them.

FC [/A] [/C] [/L] [/LBn] [/N] [/T] [/W] [/nnnn] [drive1:][path1]filename1 [drive2:][path2]filename2
FC /B [drive1:][path1]filename1 [drive2:][path2]filename2
 /A     Displays only first and last lines for each set of differences.
 /B     Performs a binary comparison.
 /C     Disregards the case of letters.
 /L     Compares files as ASCII text.
 /LBn   Sets the maximum consecutive mismatches to the specified number of lines.
 /N     Displays the line numbers on an ASCII comparison.
 /T     Does not expand tabs to spaces.
 /W     Compresses white space (tabs and spaces) for comparison.
 /nnnn  Specifies the number of consecutive lines that must match after a mismatch.
 [drive1:][path1]filename1      Specifies the first file or set of files to compare.
 [drive2:][path2]filename2      Specifies the second file or set of files to compare.

Equivalent to the Unix commands comm, cmp and diff.

[edit] fdisk

Manipulates hard disk partition tables. The name derives from IBM's habit of calling hard drives fixed disks. When run from the command line, it displays a menu of various partitioning operations:

 1. Create DOS partition or Logical DOS Drive
 2. Set active partition
 3. Delete partition or Logical DOS Drive
 4. Display partition information
 5. Change current fixed disk drive (only available if the computer has more than one hard drive)

FDISK /MBR installs a standard master boot record on the hard drive.

Fdisk exists under Unix with the same name, but it is an entirely different program. However they share purposes.

[edit] find

A filter to find lines in the input data stream that contain or don't contain a specified string and send these to the output data stream.

Find may also be used as a pipe.

find "keyword" < ''inputfilename'' > ''outputfilename''

Searches for a text string in a file or files.

FIND [/V] [/C] [/N] [/I] "string" [[drive:][path]filename[ ...]]

  /V        Displays all lines NOT containing the specified string.
  /C        Displays only the count of lines containing the string.
  /N        Displays line numbers with the displayed lines.
  /I        Ignores the case of characters when searching for the string.
  "string"  Specifies the text string to find.
  [drive:][path]filename Specifies a file or files to search.

If a pathname is not specified, FIND searches the text typed at the prompt
or piped from another command.

Equivalent to the Unix command grep. The Unix command find performs an entirely different function.

[edit] format

Delete all the files on the disk and reformat it for MS-DOS

In most cases, this should only be used on floppy drives or other removable media. This command can potentially erase everything on a computer's hard disk.

/autotest and /backup are undocumented features. Both will format the drive without a confirmation prompt.

format [options] drive
FORMAT drive: [/V[:label]] [/Q] [/F:size] [/B | /S] [/C]
FORMAT drive: [/V[:label]] [/Q] [/T:tracks /N:sectors] [/B | /S] [/C]
FORMAT drive: [/V[:label]] [/Q] [/1] [/4] [/B | /S] [/C]
FORMAT drive: [/Q] [/1] [/4] [/8] [/B | /S] [/C]
 /V[:label]  Specifies the volume label.
 /Q          Performs a quick format.
 /F:size     Specifies the size of the floppy disk to format (such
             as 160, 180, 320, 360, 720, 1.2, 1.44, 2.88).
 /B          Allocates space on the formatted disk for system files.
 /S          Copies system files to the formatted disk.
 /T:tracks   Specifies the number of tracks per disk side.
 /N:sectors  Specifies the number of sectors per track.
 /1          Formats a single side of a floppy disk.
 /4          Formats a 5.25-inch 360K floppy disk in a high-density drive.
 /8          Formats eight sectors per track.
 /C          Tests clusters that are currently marked "bad."

Known as a joke among UNIX users of that time since every user on the machine could easily cause damage with just one command. Therefore, it was known in the UNIX community as "The big DOS timesaver".

There is also an undocumented /u parameter for "unconditional" that will write strings of zeros on every sector.

Equivalent to the Unix command mkfs.

Equivalent in RT-11/RSX-11/OpenVMS operating systems line is format command which can not create filesystem. After formatting one should use initialize (contracted to init) command to create filesystem (equivalint to MS-DOS command format /q or "quick format").

[edit] help

Gives help about DOS. (5.x and later)

help 'command' would give help on a specific command. By itself, it lists the contents of DOSHELP.HLP. Help for a specific command invokes the command with the /? option. In MS-DOS 6.x this command exists as FASTHELP.

MS-DOS 6.xx help command uses qbasic to view a quickhelp HELP.HLP file, which contains more extensive information on the commands, with some hyperlinking etc. The MS-DOS 6.22 help system is included on Windows 9x cdrom versions as well.

PC-DOS 7.xx help uses view.exe to open OS/2 style .INF files (cmdref.inf, dosrexx.inf and doserror.inf), opening these to the appropriate pages.

Windows NT, all versions, uses DOS 5 style help, but versions before VISTA have also a Windows help file (NTCMDS.HLP or NTCMDS.INF) in a similar style to MS-DOS 6.

Partially equivalent to the Unix command man.

[edit] InterSvr / InterLnk

MS-DOS 6 and above command used to network PCs using a null modem cable or LapLink cable. The server-side version of InterLnk, it also immobilizes the machine it's running on as it is an active app (As opposed to a TSR) which must be running for any transfer to take place. First appeared in PC-DOS 5.02.

No direct Unix equivalent, though some Unices offer the ability to network computers with TCP/IP through null modem or Laplink cables using PLIP or SLIP.

DR DOS equivalent is filelink, which is executed on both the client and server.

[edit] label

Changes the label on a logical drive, such as a hard disk partition or a floppy disk.

In Unix and Unix-like systems, this differ from filesystem to filesystem. e2label can be used for ext2 partitions.

[edit] md or mkdir

Makes a new directory. The parent of the directory specified will be created if it does not already exist.

md directory

Equivalent to the Unix command mkdir.

[edit] mem

Displays memory usage.

mem

Equivalent to the Unix command free.

[edit] memmaker

Starting from version 6, MS-DOS included the external program MemMaker which was used to free system memory (especially Conventional memory) by automatically reconfiguring the AUTOEXEC.BAT and CONFIG.SYS files. This was usually done by moving TSR Programs to the Upper memory. The whole process required three system restarts. Before the first restart the user was asked whether he wanted to enable EMS Memory or not.

The use of MemMaker was popular among gamers who wanted to enable or disable Expanded memory in order to run a game which required EMS or not. Better results could be achieved by an experienced user manually configuring the startup files to achieve greater free memory yield.

Options:

• /BATCH Runs MemMaker in batch (unattended) mode. In batch mode, MemMaker takes the default action at all prompts.
• /UNDO Instructs MemMaker to undo its most recent changes.

PC-DOS uses another program RamBoost to optimize memory, either the HIMEM/EMM386 or a third-party memory manager.

[edit] more

Pages through the output so that you can view more than one screen of text.

command | more

Equivalent to the Unix commands more and less.

More may also be used as a filter.

more < inputfilename

[edit] move

Moves files or renames directories.

move filename newname
move driveletter:\olddir driveletter:\newdir

Example: move c:\old c:\new

Equivalent to the Unix command mv.

[edit] msd

Main article: Microsoft Diagnostics

Provides detailed technical information about the computer's hardware and software.

msd

The PC-DOS version of this command is QCONFIG.

No Unix equivalent, however in GNU/Linux similar type of information may be obtained from various text files in /proc directory.

[edit] pcpark

Parks the hard disk heads in order to enable safe shutdown; only used on early versions.

pcpark

No Unix equivalent.

MS-DOS 3.2 (and possibly others) used the command HHSET

[edit] print

Adds a file in the print queue.

Options:

• /D device  : Specifies the name of the print devices. Default value is LPT1
• /P filename : Add files in the print queue
• /T : Removes all files from the print queue
• /C filename : Removes a file from the print queue

This command was introduced in MS-DOS version 2. Before that there was no built-in support for background printing files. The user would usually use the copy command to copy files to LPT1.

Equivalent to the Unix command lpr

[edit] rd or rmdir

Remove a directory, which by default must be empty of files for the command to succeed (the /s flag removes this restriction).

rd directory

Equivalent to the Unix command rmdir.

[edit] rem

Remark statement, normally used within a batch file. An alternative way not to run a specific statement in a batch file is creating a label that will never be used, ::.

On the command line, rem can also be used to create a zero length file by redirecting an empty remark statement to a filename.

rem > newfilename

For Windows NT/2000/XP or later, to create a zero length file can also be achieved using the type command.

type > newfilename

In Unix, the # sign can be used to start a comment; the zero-length file can be achieved using various methods, such as the touch command or dd.

[edit] ren

Renames a file. Unlike the move command, this command cannot be used to rename subdirectories, or rename files across drives.

ren filename newname

A more useful function of this command is to mass rename files by the use of wildcards. For example, the following command will change the extension of all files in the current directory which currently have the extension htm to html:

ren *.htm *.html

In Unix, this functionality of a simple move is provided by the mv command, while batch renames can be done using the rename command.

Equivalent in RT-11/RSX-11/OpenVMS operating systems line is rename command which can be contracted to ren.

[edit] scandisk

Disk diagnostic utility

Scandisk is a replacement for the chkdsk utility. Its primary advantages over chkdsk is that it is more reliable and has the ability to run a surface scan which finds and marks bad clusters on the disk. It is present on 16/32-bit MS-DOS-based versions of Windows like Windows 95, 98, 98SE, and Me. chkdsk has surface scan and bad cluster detection functionality built in on Windows NT based operating systems.

Equivalent to the Unix command fsck.

[edit] set

Sets environmental variables. See Environment variable.

Since Windows 2000 it can be even used for command line inputs by using Parameter /P

set /p choice=Type your text.
echo You typed: "%choice%"

[edit] sort

A filter to sort lines in the input data stream and send them to the output data stream.

sort < inputfilename > outputfilename

Equivalent to the Unix command sort.

[edit] time and date

Display and set the time and date

time
date

When these commands are called from the command line or a batch script, they will display the time or date and wait for the user to type a new time or date and press RETURN. The command 'time /t' will bypass asking the user to reset the time.

The Unix command date displays both the time and date, but does not allow the normal users to change either. Users with superuser privileges may use date -s <new-date-time> to change the time and date.

The Unix command time performs a different function.

[edit] tree

Shows the directory tree of the current directory

Options:

/F (Displays the names of the files in each folder.)

/A (Use ASCII instead of the extended characters.)

/? (Shows the help)

tree [options] [directory]

[edit] truename

truename
        or 
truename drivename 
        or 
truename filename 
        or 
truename pathname

If typed without a parameter then the current active drive pathname is displayed.

If typed with a parameter then the command outputs the entire path (full directory and filename) of the path or filename. For example, if the working drive and directory were C:\PROGRAMS and one typed truename fish<HARDDRIVE>, the output would be C:\PROGRAMS\FISH. This command also displays the UNC pathnames of mapped network or local CD drives.

This command is an undocumented DOS command.

This command is similar to the Unix which command, which, given an executable found in $PATH, would give a full path and name. The C library function realpath performs this function.

[edit] type

Display a file. The more command is frequently used in conjunction with this command, e.g. type long-text-file | more.

type filename

Equivalent to the Unix command cat.

[edit] undelete

Restores file previously deleted with del. By default all recoverable files in the working directory are restored. The options are used to change this behaviour. If the MS-DOS mirror TSR program is used, then deletion tracking files are created and can be used by undelete.

Options :

• /list : lists the files that can be undeleted.
• /all : Recovers all deleted files without prompting. Uses a number sign for missing first character.
• /dos : Recover only MS-DOS aware files, ignore deletion tracking file.
• /dt : Recover only deletion tracking file aware files.

undelete [filespec] [/list|/all][/dos|/dt]

In Unix and Unix-like systems this differs from filesystem to filesystem. People who use the ext2 filesystem can try the command e2undel.

[edit] ver

Shows the version of MS-DOS you are using.

Some versions of MS-DOS support an undocumented /r switch, which will show the revision as well as the version.

ver [/r]

Roughly equivalent to the Unix command uname.

[edit] xcopy

Copy entire directory trees.

xcopy directory [destination-directory]

Equivalent to the Unix command cp when used with -a or -p parameters.

[edit] See also

• Command Line Interface
• Disk Operating System
• List of Unix programs

[edit] External links

• The MS-DOS 6 Technical Reference on TechNet contains the official Microsoft MS-DOS 6 command reference documention.

There are several guides to DOS commands available that are licenced under the GNU Free Documentation License:

• The FreeDOS HTML Help at fdos.org is a fully hypertext help system for FreeDOS commands, written in 2003/2004
• The FreeDOS Spec at SourceForge is a plaintext specification, written in 1999, for how DOS commands should work in FreeDOS

Wikibooks also has a guide to Microsoft Windows (as opposed to DOS) commands.

• MS-DOS commands

• CMD commands in Windows Vista up to date for the current Windows Vista OS

• A Collection of Undocumented and Obscure Features in Various MS-DOS Versions