+   Sets an attribute.
  -   Clears an attribute.
  R   Read-only file attribute.
  A   Archive file attribute.
  S   System file attribute.
  H   Hidden file attribute.
  /S  Processes files in all directories in the specified path.

Type BREAK without a parameter to display the current BREAK setting.

  batch-parameters   Specifies any command-line information required by the 
                            batch program.

Displays the name of or changes the current directory



  ..   Specifies that you want to change to the parent directory.

Type CD drive: to display the current directory in the specified drive.
Type CD without parameters to display the current drive and directory.

  nnn   Specifies a code page number.

Type CHCP without a parameter to display the active code page number.

  [drive:][path]  Specifies the drive and directory to check.
  filename        Specifies the file(s) to check for fragmentation.
  /F              Fixes errors on the disk.
  /V              Displays the full path and name of every file on the disk.

Type CHKDSK without parameters to check the current disk.

Instead of using CHKDSK, try using SCANDISK.  SCANDISK can reliably detect
and fix a much wider range of disk problems.

/C[:]choices Specifies allowable keys. Default is YN
/N           Do not display choices and ? at end of prompt string.
/S           Treat choice keys as case sensitive.
/T[:]c,nn    Default choice to c after nn seconds
text         Prompt string to display

ERRORLEVEL is set to offset of key user presses in choices.

  
  [drive:]path    Specifies the directory containing COMMAND.COM.
  device          Specifies the device to use for command input and output.
  /E:nnnnn        Sets the initial environment size to nnnnn bytes.
                  (nnnnn should be between 256 and 32,768).
  /L:nnnn         Specifies internal buffers length (requires /P as well).
                  (nnnn should be between 128 and 1,024).
  /U:nnn          Specifies the input buffer length (requires /P as well).
                  (nnn should be between 128 and 255).
  /P              Makes the new Command Interpreter permanent (can't exit).
  /MSG            Stores all error messages in memory (requires /P as well).
  /LOW            Forces COMMAND to keep its resident data in low memory.
  /Y              Steps through the batch program specified by /C or /K.
  /C command      Executes the specified command and returns.
  /K command      Executes the specified command and continues running.

 
  source       Specifies the file or files to be copied.
  /A           Indicates an ASCII text file.
  /B           Indicates a binary file.
  destination  Specifies the directory and/or filename for the new file(s).
  /V           Verifies that new files are written correctly.
  /Y           Suppresses prompting to confirm you want to overwrite an
               existing destination file.
  /-Y          Causes prompting to confirm you want to overwrite an
               existing destination file.

The switch /Y may be preset in the COPYCMD environment variable.
This may be overridden with /-Y on the command line

To append files, specify a single file for destination, but multiple files
for source (using wildcards or file1+file2+file3 format).

  device   The terminal device you want to use, such as COM1.

Type DATE without parameters to display the current date setting and
a prompt for a new one.  Press ENTER to keep the same date.

  [drive:][path]filename  Specifies the file you want to test.
  testfile-parameters     Specifies command-line information required by
                          the file you want to test.

After Debug starts, type ? to display a list of debugging commands.

  [drive:][path]filename  Specifies the file(s) to delete.  Specify multiple
                          files by using wildcards.
  /P		Prompts for confirmation before deleting each file.

  Y/              Suppresses prompting to confirm you want to delete
                  the sub-directory.
  [drive:]path    Specifies the name of the directory you want to delete.

Note: Use DELTREE cautiously. Every file and sub-directory within the
specified directory will be deleted.

  [drive:][path][filename]
              Specifies drive, directory, and/or files to list.
              (Could be enhanced file specification or multiple filespecs.)
  /P          Pauses after each screenful of information.
  /W          Uses wide list format.
  /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
  /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 (earliest first)
                 G  Group directories first    -  Prefix to reverse order
                 A  By Last Access Date (earliest first)
  /S          Displays files in specified directory and all sub-directories.
  /B          Uses bare format (no heading information or summary).
  /L          Uses lower case.
  /V          Verbose mode.

Switches may be preset in the DIRCMD environment variable.  Override
preset switches by pre-fixing any switch with - (hyphen) for example, /-W.

  /1   Copies only the first side of the disk.
  /V   Verifies that the information is copied correctly.
  /M   Force multi-pass copy using memory only.

The two floppy disks must be the same type.
You may specify the same drive for drive1 and drive2.

  /BUFSIZE:size Sets size of macro and command buffer            (default:512)
  /ECHO:on|off  Enables/disables echo of macro expansions        (default:on)
  /FILE:file    Specifies file containing a list of macros
  /HISTORY      Displays all commands stored in memory
  /INSERT       Inserts new characters into line when typing
  /KEYSIZE:size Sets size of keyboard type-ahead buffer          (default:15)
  /LINE:size    Sets maximum size of line edit buffer            (default:128)
  /MACROS       Displays all DOSKey macros
  /OVERSTRIKE   Overwrites new characters onto line when typing  (default)
  /REINSTALL    Installs a new copy of DOSKey
  macroname     Specifies a name for a macro you create
  text          Specifies commands you want to assign to the macro

  UP,DOWN arrows recall commands
      Esc clears current command
       F7 displays command history
   Alt+F7 clears command history
[chars]F8 searches for command beginning with [chars]
       F9 selects a command by number
  Alt+F10 clears macro definitions

The following are special codes you can use in DOSKey macro definitions:
  $T     Command separator: allows multiple commands in a macro
  $1-$9  Batch parameters: equivalent to %1-%9 in batch programs
  $*     Symbol replaced by everything following macro name on the command line

Type ECHO without parameters to display the current echo setting.

 
  /B       - Forces monochrome mode.
  /H       - Displays the maximum number of lines possible for your hardware.
  /R       - Load file(s) in read-only mode.
  /S       - Forces the use of short filenames.
  /   - Load binary file(s), wrapping lines to  characters wide.
  /?       - Displays this help screen.
  [file]   - Specifies initial files(s) to load.  Wildcards and multiple
                    filespecs can be given.

  ON | OFF | AUTO      Activates or suspends EMM386.EXE device driver,
                          or places it in auto mode.
  W=ON | OFF           Turns on or off Weitek co-processor support.

  [drive:][path]filename  Specifies the file(s) to delete.  Specify multiple
                              files by using wildcards.
  /P		Prompts for confirmation before deleting each file.

  cabinet  - Cabinet file (contains two or more files).
  filename - Name of the file to extract from the cabinet.
             Wild cards and multiple filenames (separated by
             blanks) may be used.

  source   - Compressed file (a cabinet with only one file).
  newname  - New filename to give the extracted file.
             If not supplied, the original name is used.

  /A         Process ALL cabinets.  Follows cabinet chain
             starting in first cabinet mentioned.
  /C         Copy source file to destination (to copy from DMF disks).
  /D         Display cabinet directory (use with filename to avoid extract).
  /E         Extract (use instead of *.* to extract all files).
  /L dir     Location to place extracted files (default is current directory).
  /Y         Do not prompt before overwriting an existing file. 

  /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.

  /STATUS   Displays partition information.
  /X        Ignores extended disk-access support. Use this switch if you
            receive disk access or stack overflow messages.

  /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 path name is not specified, FIND searches the text typed at the prompt
or piped from another command.

  %variable  Specifies a replaceable parameter.
  (set)      Specifies a set of one or more files.  Wildcards may be used.
  command    Specifies the command to carry out for each file.
  command-parameters  Specifies parameters or switches for the specified command.

To use the FOR command in a batch program, specify %%variable instead of
%variable.

  /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."

  label   Specifies a text string used in the batch program as a label.

You type a label on a line by itself, beginning with a colon.

  NOT               Specifies that Windows should carry out the command only
                    if the condition is false.
  ERRORLEVEL number Specifies a true condition if the last program run returned
                    an exit code equal to or greater than the number specified.
  command           Specifies the command to carry out if the condition is met.
  string1==string2 Specifies a true condition if the specified text strings match.
  EXIST filename    Specifies a true condition if the specified filename exists.

  xx                      Specifies a two-letter keyboard code.
  yyy                     Specifies the code page for the character set.
  [drive:][path]filename  Specifies the keyboard definition file.
  /E                      Specifies that an enhanced keyboard is installed.
  /ID:nnn                 Specifies the keyboard in use.

/L:region1[,minsize1][;region2[,minsize2]]...
            Specifies the region(s) of memory into which to load
            the program.  Region1 specifies the number of the first
            memory region; minsize1 specifies the minimum size, if
            any, for region1.  Region2 and minsize2 specify the
            number and minimum size of the second region, if any.
            You can specify as many regions as you want.

/S   Shrinks a UMB to its minimum size while the program is loading.

[drive:][path]filename
            Specifies the location and name of the program.

  /CLASSIFY or /C  Classifies programs by memory usage. Lists the size of
                   programs, provides a summary of memory in use, and lists
                   largest memory block available.
  /DEBUG or /D     Displays status of all modules in memory, internal drivers,
                   and other information.
  /FREE or /F      Displays information about the amount of free memory left
                   in both conventional and upper memory.
  /MODULE or /M    Displays a detailed listing of a module's memory use.
                   This option must be followed by the name of a module,
                   optionally separated from /M by a colon.
  /PAGE or /P      Pauses after each screenful of information.

Printer port:     MODE LPTn[:] [COLS=c] [LINES=l] [RETRY=r]
Serial port:    MODE COMm[:] [BAUD=b] [PARITY=p] [DATA=d] [STOP=s] [RETRY=r]
Device Status:    MODE [device] [/STATUS]
Redirect printing:MODE LPTn[:]=COMm[:]
Prepare code page:MODE device CP PREPARE=((yyy[...]) [drive:][path]filename)
Select code page: MODE device CP SELECT=yyy
Refresh code page:MODE device CP REFRESH
Code page status: MODE device CP [/STATUS]
Display mode:     MODE [display-adapter][,n]
                  MODE CON[:] [COLS=c] [LINES=n]
Typematic rate:   MODE CON[:] [RATE=r DELAY=d]

  [drive:][path]filename  Specifies file(s) to display one screen at a time
  command-name            Specifies a command whose output will be displayed.

To move one or more files:
MOVE [/Y | /-Y] [drive:][path]filename1[,...] destination

To rename a directory:
MOVE [/Y | /-Y] [drive:][path]dirname1 dirname2

  [drive:][path]filename1 Specifies the location and name of the file
                          or files you want to move.
  destination             Specifies the new location of the file. Destination
                          can consist of a drive letter and colon, a directory
                          name, or a combination. If you are moving only one
                          file, you can also include a filename if you want
                          to rename the file when you move it.
  [drive:][path]dirname1  Specifies the directory you want to rename.
  dirname2                Specifies the new name of the directory.

  /Y              Suppresses prompting to confirm creation of a directory
                  or overwriting of the destination.
  /-Y             Causes prompting to confirm creation of a directory or
                  overwriting of the destination.

The switch /Y may be present in the COPYCMD environment variable.
This may be overridden with /-Y on the command line.

  [drive:][path]filename   Specifies the file containing country-specific
                                 information.

Type PATH ; to clear all search-path settings and direct Windows to search
only in the current directory.
Type PATH without parameters to display the current path.

  text    Specifies a new command prompt.

Prompt can be made up of normal characters and the following special codes:

  $Q   = (equal sign)
  $$   $ (dollar sign)
  $T   Current time
  $D   Current date
  $P   Current drive and path
  $V   Windows version number
  $N   Current drive
  $G   > (greater-than sign)
  $L   < (less-than sign)
  $B   | (pipe)
  $H   Backspace (erases previous character)
  $E   Escape code (ASCII code 27)
  $_   Carriage return and linefeed

Type PROMPT without parameters to reset the prompt to the default setting.

  variable  Specifies the environment-variable name.
  string    Specifies a series of characters to assign to the variable.

Type SET without parameters to display the current environment variables.

  [drive:path]    Specifies location of the SETVER.EXE file.
  filename        Specifies the filename of the program.
  n.nn            Specifies the MS-DOS version to be reported to the program.
  /DELETE or /D   Deletes the version-table entry for the specified program.
  /QUIET or /Q    Hides the message typically displayed during deletion of
                  version-table entry.

/X              Disables write-behind caching for all drives.
drive           Sets caching options on specific drive(s). The specified
                drive(s) will have write-caching disabled unless you add +.
+               Enables write-behind caching for the specified drive.
-               Disables all caching for the specified drive.
/U              Do not load CD-ROM caching module.
/C              Writes all information currently in write-cache to hard disk. 
/R              Clears the cache and restarts SMARTDrive.
/F              Writes cached data before command prompt returns (default).
/N              Doesn't write cached data before command prompt returns.
/L              Prevents SMARTDrive from loading itself into upper memory.
/V              Displays SMARTDrive status messages when loading.
/Q              Does not display status information.
/S              Displays additional information about SMARTDrive's status.
InitCacheSize   Specifies XMS memory (KB) for the cache.
WinCacheSize    Specifies XMS memory (KB) for the cache with Windows.
/E:ElementSize  Specifies how many bytes of information to move at one time.
/B:BufferSize   Specifies the size of the read-ahead buffer.

  /R                         Reverses the sort order; that is, sorts Z to A,
                             then 9 to 0.
  /+n                        Sorts the file according to characters in
                             column n.
  [drive1:][path1]filename1  Specifies file(s) to be sorted
  [drive2:][path2]filename2  Specifies a file where the sorted input is to be
                             stored.
  command                    Specifies a command whose output is to be sorted.

  drive1:        Specifies a virtual drive to which you want to assign a path.
  [drive2:]path  Specifies a physical drive and path you want to assign to
                 a virtual drive.
  /D             Deletes a substituted (virtual) drive.

Type SUBST with no parameters to display a list of current virtual drives.

Type TIME with no parameters to display the current time setting and a prompt
for a new one.  Press ENTER to keep the same time.

 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.

Additional information :
XCOPY http://www3.sympatico.ca/rhwatson/dos7/z-xcopy.html