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 command chmod. In Linux, the command chattr also performs similar functions.

cd or chdir
Change current directory.
cd directory
Equivalent to the Unix command cd (with parameters), or pwd (without parameters). (cd .. descends a directory.)

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
chkdsk drive [[path]filename] [/F] [/V]
Equivalent to the Unix command fsck

cls
Clears the screen.
cls
Equivalent to the Unix command 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.
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.

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.

defrag
Defragments disk drive
defrag driveletter
No Unix equivalent.
DR DOS equivalent was the diskopt command.

del or erase
Deletes files.
del filename
erase filename
To delete files in Quiet mode
del /Q filename
Equivalent to the Unix command rm.

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 the use of the rmdir command as in the following example:

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

dir
Main article: Dir (DOS Command)

Displays contents of a directory.
Options : * /w : Wide list format * /p : Pause at every page * /s : Also look in subdirectories * /a[xx] : Display files with the specified attributes only * /o[xx] : Modifies sort order * /b : Uses bare format (no heading information or summary)]]]]]]]]]]

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

more options:

DIR [drive:][path][filename] [/A[[:]attributes]] [/B] [/C] [/D] [/L] [/N]

[/O[[:]sortorder]] [/P] [/Q] [/S] [/T[[:]timefield]] [/W] [/X] [/4]
[drive:][path][filename] Specifies drive, directory, and/or files to list.

/A Displays files with specified attributes. attributes: D Directories R Read-only files

H Hidden files
A Files ready for archiving S System files - Prefix meaning not

/B Uses bare format (no heading information or summary).

/C Display the thousand separator in file sizes. This is the default. Use /-C to disable display of separator.

/D Same as wide but files are list sorted by column.

/L Uses lowercase.

/N New long list format where filenames are on the far right.

/O List by files in sorted order. sortorder: N By name (alphabetic) S By size (smallest first) E By extension (alphabetic) D By date/time (oldest first) G Group directories first - Prefix to reverse order

/P Pauses after each screenful of information.

/Q Display the owner of the file.

/S Displays files in specified directory and all subdirectories.

/T Controls which time field displayed or used for sorting. timefield C Creation A Last Access W Last Written

/W Uses wide list format.

/X This displays the short names generated for non-8dot3 file names. The format is that of /N with the short name inserted before the long name. If no short name is present, blanks are displayed in its place.

/4 Displays four-digit years

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.

exit
Exits the current batch script or the controlling thread. When running from Windows this will close the command prompt.
EXIT [/B] [exitcode]
/B Exit the current batch script and set ERRORLEVEL to exitcode
Without this option, the controlling thread and any intermediate
batch files are immediately exited, and the process return code
is set to exitcode.
Exit also exists in Unix-shells.

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.

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
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.

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; see tree.

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".

Equivalent to the Unix command mkfs.

help
Gives help about DOS.
help 'command' would give help on a specific command, in MS-DOS 6 a HELP program was started which would give more details and examples, earlier versions basically gave the same information as command/? would give.
Partially equivalent to the Unix command man.

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's an active app (As opposed to a TSR) which must be running for any transfer to take place.
No Unix equivalent.
DR DOS equivalent is filelink, which is executed on both the client and server.

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.

md or mkdir
Makes a new directory. The parent of the directory specified must already exist.
md directory
Equivalent to the Unix command mkdir.

mem
Displays memory usage.
mem
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 3 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. The result would however not always be as good as if someone changing the settings himself.
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.

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: move c:\old c:\new
Equivalent to the Unix command mv.

msd
Main article: Microsoft Diagnostics

Provides detailed technical information about the computer's hardware and software.
msd
No Unix Equvivalent, however in GNU/Linux similar type of information may be obtained from various text files in /proc directory.

pcpark
Parks the hard disk(s) (stops their turning) 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

rd or rmdir
Remove a directory, which must be empty of files for the command to succeed.
rd directory
Equivalent to the Unix command rmdir.

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
Note that this works only for the old DOS and under Windows 9x. For Windows NT/2000/XP or later, to create a zero length file can be achieved using the type command.
type zerolengthfilename > zerolengthfilename
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.

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 from htm to html:

ren *.htm *.html
In Unix, this functionality of a simple move is provided by the mv command, but changing extension of all files is not as simple..

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.

set
Sets environmental variables. See Environment variable.

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.

time and date
Set/display the date and time
date
time
Equivalent to the Unix command date with the important difference that calling this from the command line or a bat script will cause the program to halt requesting a new time until RETURN is pressed. The command 'time /t' will bypass this set feature.

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]
Equivalent to the Unix command find.

truename
truename filename
Outputs the entire path (full directory and filename) of a file. 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 was rarely, if ever, documented in DOS manuals.
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.

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.

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 differ from filesystem to filesystem. e2undel can be used for ext2 users.

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]
Equivalent to the Unix command uname. However, in Linux uname may simply refer to the version of the kernel rather than the operating system itself, which is sometimes stored in a text file in /etc/name_version, or command lsb_release -a.

xcopy
Copy entire directory trees.
xcopy directory [destination-directory]
Copies files and directory trees. In Unix, similar functionality is provided by the cp command. However, some functionality of xcopy is not available in the cp command. The pattern mechanism of cp is restricted to expand only the names of the files in the source directory. For example, let's suppose that the temp/ directory had the files a.txt and b.txt, and the subdirectory temp/sub/ had the files c.txt and d.txt; then, the following Unix command:
cp -R temp/*.txt temp2/
Would not be equivalent to xcopy temp\*.txt temp2. In Unix, the example above would be expanded to:
cp -R temp/a.txt temp/b.txt temp2
That would mean that any files not named a.txt or b.txt in subdirectories of temp/ would not be copied.
XCOPY source [destination] [/A | /M] [/D[:date]] [/P] [/S [/E]] [/W]
[/C] [/I] [/Q] [/F] [/L] [/H] [/R] [/T] [/U]
[/K] [/N]
source Specifies the file(s) to copy.
destination Specifies the location and/or name of new files.
/A Copies files with the archive attribute set,
doesn't change the attribute.
/M Copies files with the archive attribute set,
turns off the archive attribute.
/D:date Copies files changed on or after the specified date.
If no date is given, copies only those files whose
source time is newer than the destination time.
/P Prompts you before creating each destination file.
/S Copies directories and subdirectories except empty ones.
/E Copies directories and subdirectories, including empty ones.
Same as /S /E. May be used to modify /T.
/W Prompts you to press a key before copying.
/C Continues copying even if errors occur.
/I If destination does not exist and copying more than one file,
assumes that destination must be a directory.
/Q Does not display file names while copying.
/F Displays full source and destination file names while copying.
/L Displays files that would be copied.
/H Copies hidden and system files also.
/R Overwrites read-only files.
/T Creates directory structure, but does not copy files. Does not
include empty directories or subdirectories.
/T /E includes empty directories and subdirectories.
/U Updates the files that already exist in destination.
/K Copies attributes. Normal Xcopy will reset read-only attributes.
/Y Overwrites existing files without prompting.
/-Y Prompts you before overwriting existing files.
/N Copy using the generated short names.