DOS commands

From Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/List_of_DOS_commands

A partial list of the most common commands for DOS follows.

append

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]

assign

The command redirects requests for disk operations on one drive to a different drive.

 assign [x[:]=y[:]...
assign /STATUS

Options:

  • x The drive letter to reassign.
  • y The drive letter that x: will be assigned to.
  • /STATUS Displays the current drive assignments.

If typed without parameters then all drive letters are reset to original assignments.

The command is available in MS-DOS 5.00.

attrib

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

 ATTRIB [+R|-R] [+A|-A] [+S|-S] [+H|-H][drive:][path][filename] [/S [/D]]

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
    • /D – Process folders as well.
    • /S – Process matching files in the current folder and all subfolders.

Note: Everything inside a brace [option] is an optional item. Roughly equivalent to the Unix commands chattr and lsattr.

backup and restore

Programs to back up and restore files from an external disk. These appeared in version 2, and continued to PC-DOS 5 and MS-DOS 6 (PC-DOS 7 had a deversioned check).

In DOS 6, these were replaced by commercial programs (CPBACKUP, MSBACKUP), which allowed files to be restored to different locations.

BASIC and BASICA

An implementation of the BASIC programming language for PCs.

IBM computers had BASIC 1.1 in ROM, and IBM’s versions of BASIC used code in this ROM-BASIC, which allowed for extra memory in the code area. BASICA last appeared in IBMDOS 5.02, and in OS/2 (2.0 and later), the version had ROMBASIC moved into the program code.

Microsoft released GW-BASIC for machines with no ROM-BASIC. Some OEM releases had basic.com and basica.com as loaders for GW-BASIC.EXE.

Call

Calls one batch program from another. A new batch file context is created with the specified arguments and control is passed to the statement after the label specified.

Syntax:

 call [filespec][batch file parameters]
  • filespec: name and if necessary path of the new batch file
  • parameters: switches

cd or chdir

Change current working directory. Displays the current working directory when used without a path parameter.

 cd

displays the current working directory on the current drive.

 cd directory

changes the working directory on the current drive to directory.

 chdir e:directory

changes the working directory on E: to directory.

 cd ..

changes the working directory to the parent directory (up one directory level).

 cd \

changes the working directory to the root (top level) directory of the current drive.

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

chcp

Changes the code page used to display character glyphs in a console window.

 chcp [codepage]

With a numeric parameter, this command changes the codepage setting to codepage. Without a parameter, the command displays the currently active codepage.

chkdsk

Verifies a storage volume (hard disk, partition, floppy disk, flash drive, etc) for file system integrity.

Options:

  • /F : Fixes errors on the volume (without /F , chkdsk only detects errors)
  • /P : Forces a full verification
  • /R : Searches for defective sectors and recovers legible information (applies /F)
  • /X : Unmounts the volume before processing if needed. (Note: Unmounting temporarily invalidates all pointers/handlers to the volume until process is completed)
 chkdsk volume letter: [[path]filename] [/F] [/P] [/R] [/X]

Equivalent to the Unix command fsck

choice

Allows for batch files to prompt the user to select one item from a set of single-character choices.

Introduced in MS-DOS 6;[1] DR-DOS 7.03.[2] Earlier versions of DR-DOS supported this function with the switch command (for numeric choices) or by beginning a command with a question mark.[2]

This command was formerly called ync. (yes-no-cancel).

cls

Clears the screen.

 cls

Equivalent to the Unix clear.

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.

Syntax:

 copy from  to [destination\folder]

Files may be copied to devices. For example, copy file lpt1 sends the file to the printer on LPT1. copy file con outputs file to the screen (“console”), which can also be done using type file. Devices themselves may be copied: copy con file takes the text typed into the console and puts it into file, stopping when EOF (Ctrl+Z) is typed.

Files may be concatenated using +. For example, copy file1+file2 file_cat will concatenate the files and output them as file_cat. There are two switches to modify the command’s behaviour, /a (text mode, the default) and /b (binary mode). In text mode, copy will stop when it reaches the EOF character; in binary mode, the files will be concatenated in their entirety, ignoring EOF characters.

Examples of usage:

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

Equivalent Unix commands are cp (for copying) and cat (for concatenation). Device files may be copied in Unix as well, e.g. cp file /dev/tty will display a file on the screen (but cat file is more commonly used here).

Equivalent RT-11/RSX-11/OpenVMS command is copy.

Examples of usage:

 copy con filename.extension

Everything typed at the console is sent to the file, until a control Z character is typed.

ctty

Defines the device to use for input and output.

Syntax:

 ctty device
  • device: The terminal device to be used.

Example of usage:

 ctty COM1
hello

defrag

(in MS/PC-DOS; diskopt in DR-DOS)

Defragments a disk drive.

Options:

Example of usage:

 defrag driveletter: -a -v

No Unix equivalent.

del or erase

Deletes one or more files.

This command is used to delete a particular or more files.

Syntax:

del filename
erase filename
 Options
 *.*  All files in current folder
*.* /s all files in current folder and sub folders,

Equivalent to the Unix command rm.

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

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).

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) (this is not a parameter, it is output redirection)

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.

Other less commonly used parameters of dir include:

  • /D : Display wide format but sorted by column
  • /L : Display forced into lowercase
  • /N : Display forced into long file name format instead of 8.3
  • /Q : Displays the owner of each file
  • /X : Display shows 8.3 names next to long file names

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 in the opposite manner to /w.)

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

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

Full-screen text editor, included with MS-DOS 5 and 6, OS/2 and Windows NT to 4.0

  • Windows 95 and later, and W2k and later use Edit v 2.0
  • PC-DOS 6 and later use the DOS E Editor.
  • DR-DOS used editor up to version 7.

edlin

DOS line-editor. It can be used with a script file, like debug, this makes it of some use even today. The absence of a console editor in MS/PC-DOS 1-4 created an after-market for third-party editors.

In DOS 5, an extra command “?” was added to give the user much needed help.

DOS 6 was the last version to contain EDLIN, for MS-DOS 6, it’s on the supplemental disks, PC-DOS 6 had it in the base install. Windows NT 32-bit, and OS/2 have Edlin.

exe2bin

Converts an executable (.exe) file into a binary file with the extension .com, 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.

exit

Exits the current command processor. If the exit is used at the primary command, it has no effect unless in a DOS window under Microsoft Windows, in which case the window is closed and the user returns to the desktop.

exit [/B]
  /B When used within a batch script, exits the script without closing the calling DOS window

Exit also exists in Unix-shells. If an exit command is used in the primary command shell under Unix, however, it will logoff the user, similar to the control-D keystroke.

fastopen

Main article: FASTOPEN

fc or comp

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.[citation needed]

Equivalent to the Unix commands comm, cmp and diff.

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 /MBR #: where # is other partition on system. Completes above command on indicated partition.

e.g.: "C:\FDISK /MBR D:" would install boot record on D:\ partition.

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

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 analogous to dir /s.

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."

There is also an undocumented /u parameter for “unconditional” that will write strings of zeros on every sector. This is now an official switch in Windows Vista and 7 but with the parameter /p instead.

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 (Equivalent to MS-DOS command format /q or “quick format”).

help

Gives help about DOS.

MS-DOS

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

PC-DOS 5,6 help is the same form as MS-DOS 5 help command.

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.

DR-DOS

In DR-DOS, help is a batch file that launches DR-DOS’ reference, dosbook.

Microsoft Windows

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.

FreeDOS

FreeDOS uses an HTML help system, which views HTML help files on a specified path. The path is stored in HELPPATH environment variable, if not specified, default path is \HELP on the drive which HELP is placed.

Partially equivalent to the Unix command man.

intersvr & interlnk

(in MS-DOS; filelink in DR-DOS)

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. DR-DOS’ filelink is executed on both the client and server.

New in PC-DOS 5.02, MS-DOS 6.0[3]

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.

join

Attaches a drive letter to a specified directory on another drive.

JOIN d: [d:\path]
JOIN [/D] (removes drive assignment)

If JOIN a: c:\floppy were executed, c:\floppy would display the contents of the a: drive. The opposite can be achieved via the subst command.

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 differs from filesystem to filesystem. e2label can be used for ext2 partitions.

loadfix

Loads a program above the first 64K of memory, and runs the program.

loadfix [drive:][path]filename

Included only in MS/PC-DOS. DR-DOS used memmax, which opened or closed lower, upper, and video memory access, to block the lower 64K of memory.[4]

loadhigh, lh

Main article: loadhigh

hiload in DR-DOS.

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.

mem

Displays memory usage.

mem

Options:

  • /CLASSIFY or /C – Lists the size of programs, provides a summary of memory in use and lists largest memory block available.
  • /DEBUG or /D – Displays status of programs, internal drivers, and other information.
  • /PROGRAM or /P Displays status of programs currently loaded in memory.

Equivalent to the Unix command free.

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/she 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.

mode

Configures system devices. Changes graphics modes, adjusts keyboard settings, prepares code pages, and sets up port redirection.[5]

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

move

Moves files or renames directories.

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

Example of usage:

move c:\old c:\new

Equivalent to the Unix command mv. DR-DOS used a separate command for renaming directories, rendir.

msd

Main article: Microsoft Diagnostics

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

msd

New in MS-DOS 6;[6] the PC-DOS version of this command is QCONFIG.[citation needed] The command appeared first in Word2, and then in Windows 3.10.

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

path

Displays or sets a search path for executable files.

pause

Suspends processing of a batch program and displays the message ‘Press any key to continue. . .’. This command exists in all versions of Microsoft Windows and has the exact same function.

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

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 commands lp and lpr.

rd or rmdir

Remove a directory, which by default must be empty of files for the command to succeed. The DELTREE command in DOS removes non-empty directories. In Windows NT’s CMD.EXE, rd /s functions in the same way as deltree.

rem

Remark statement, normally used within a batch file, or for DOS 6 and above, in CONFIG.SYS.

rem This creates a zero-byte file in some command processors.
rem > newfilename  
:: This never creates a file
:: > filename.ext

Redirecting the output from a rem command produces a zero-byte file in some command processors.

REM is also useful in logged sessions or screen-captures.

In Unix, the # sign can be used to start a comment.

ren

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

ren filename newname

You can rename files in another directory by using the PATH parameter:

ren [[path\]filename] [newfilename]

This example renames c:\windows\filex.txt to c:\windows\filey.txt

ren c:\Windows\filex.txt filey.txt

Using a path in the destination newname will move the file to the new path, if this is on the same device. This renames the file to the c:\temp directory.

ren c:\windows\filex.txt \temp\filey.txt

On DOS with long filename support, care must be taken when directories have spaces in their names like “Documents and Settings”. In these cases double-quotes are used to enclose them. Note it is necessary only to enclose blocks including spaces.

ren c:\"Documents and Settings"\"All Users"\Desktop\filex.txt filey.txt
ren "c:\Documents and Settings\All Users\Desktop\filex.txt" filey.txt

Wildcards in the destination are replaced by the corresponding part of the original name, so the command below will change the extension of the file from .doc to .txt, here myfile.doc becomes myfile.txt.

ren myfile.doc *.txt

Mass renames can be accomplished 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.

scandisk

Disk diagnostic utility. Scandisk was a replacement for the chkdsk utility, starting with later versions of MS-DOS. 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 also provided mouse point-and-click TUI, allowing for interactive session to complement command-line batch run.

chkdsk had surface scan and bad cluster detection functionality included, and was used again on Windows NT based operating systems.

Equivalent to the Unix command fsck.

set

Sets environmental variables. See Environment variable.

CMD.EXE in Windows NT 2000, 4DOS, 4OS2, 4NT, and a number of third-party solutions allow direct entry of environment variables from the command prompt, in the manner of set /p.

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

From at least Windows 2000, the set command with the /A switch allows the evaluation of strings into variables, thus providing inter alia a means of performing integer arithmetic.[7]

setver

TSR designed to return a different value to the version of DOS that is running. This allows programs that look for a specific version of DOS to run under a different DOS.

Setver appeared in version 4, and has been in every version of DOS, OS/2 and Windows NT since.

share

Installs support for file sharing and locking capabilities.

share [/F:space] [/L:locks] 
 /F:space Allocates file space (in bytes) for file-sharing information.
 /L:locks Sets the number of files that can be locked at one time.

smartdrive

Main article: SmartDrive

sort

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

sort < inputfilename > outputfilename

Similar to the Unix command sort. Handles files up to 64k. This sort is always case insensitive.[8]

subst

A utility to map a subdirectory to a drive letter.

subst <d:> <path>
subst <d:> /D   (Deletes the substitute drive)

If SUBST e: c:\edrive were executed, a new drive letter e: would be created, showing the contents of c:\edrive. The opposite can be achieved via the join command.

sys

A utility to make a volume bootable. Sys rewrites the Volume Boot Code (the first sector of the partition that Sys is acting on) so that the code, when executed, will look for Io.sys. Sys also copies the core DOS system files, Io.sys, Msdos.sys, and Command.com, to the volume. Sys does NOT rewrite the Master Boot Record, contrary to widely-held belief.

time and date

Display and set the time and date

time
date

When these commands are called from the command line or a batch file, they will display the time or date and wait for the user to type a new time or date and press RETURN. The commands time /t and date /t will display output without waiting for input.

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.

tree

Shows the directory tree of the current directory

Syntax:

tree [options] [directory]

Options:

  • /F (Displays the names of the files in each folder.)
  • /A (Use ASCII instead of the extended characters.)
  • /? (Shows the help)

Note: Does not work on some computers with Windows 7 OS.

truename

truename        or 
truename drivename         or 
truename filename         or 
truename directory

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

MS-DOS can find files and directories given their names, without full path information, if the search object is on a path specified by the environment variable PATH. For example, if PATH includes C:\PROGRAMS, and file MYPROG.EXE is on this directory, then if MYPROG is typed at the command prompt, the command processor will execute C:\PROGRAMS\MYPROG.EXE

the TRUENAME command will expand a name in an abbreviated form which the command processor can recognise into its full form, and display the result. It can see through SUBST and JOIN to find the actual directory. In the above example,

TRUENAME MYPROG

would display

C:\PROGRAMS\MYPROG.EXE

and for a substituted drive set up by

subst d: c:\util\test

the command

truename d:\test.exe

will display

c:\util\test\test.exe

This command also displays the UNC pathnames of mapped network or local CD drives.

This command is an undocumented DOS command. The help switch “/?” defines it as a “Reserved command name”. It is available in MS-DOS 5.00.

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.

The Microsoft Windows command processors do not support this command.

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. Note that you can use this to concatenate files (type file1 file2 > file3) however this won’t work for large files–use copy command instead.

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 behavior. if the MS-DOS mirror TSR program is used, then deletion tracking files are created and can be used by undelete.

Syntax:

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

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.

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

Ver

An internal DOS command, that reports the DOS version presently running, and since MS-DOS 5, whether DOS is loaded high. The corresponding command to report the Windows version is winver.

Options: DOS 5 and later

  • /r  : revision level, also shows whether DOS is loaded high
  • /?  : shows command line help.

Value returned:

  • MS-DOS up to 6.22, typically derive the DOS version from the DOS kernel. This may be different from the string it prints when it starts.
  • PC-DOS typically derive the version from an internal string in command.com (so PC-DOS 6.1 command.com reports the version as 6.10, although the kernel version is 6.00.)
  • DR-DOS reports whatever value the environment variable OSVER reports.
  • OS/2 command.com reports an internal string, with the OS/2 version. The underlying kernel here is 5.00, but modified to report x0.xx (where x.xx is the OS/2 version).
  • Windows 9x command.com report a string from inside command.com. The build version (e.g. 2222), is also derived from there.
  • Windows NT command.com reports either the 32-bit processor string (4nt, cmd), or under some loads, MS-DOS 5.00.500, (for all builds). The underlying kernel reports 5.00 or 5.50 depending on the interrupt. MS-DOS 5.00 commands run unmodified on NT.
  • The Winver command usually displays a Windows dialog showing the version, with some information derived from the shell. In windows before Windows for workgroups 3.11, running winver from DOS reported an embedded string in winver.exe.

verify

Enables or disables the feature to determine if files have been correctly written to disk.

If no parameter is provided, the command will display the current setting.

verify [on|off]

xcopy

Copy entire directory trees.

Xcopy is a version of the copy command that can move files and directories from one location to another.

xcopy directory [destination-directory]

Equivalent to the Unix command cp when used with -r parameter.

This entry was posted in Computer science. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s