Used in the CONFIG.SYS file to set the number of disk buffers (number)
be available for use during data input. Also used to set a value for the
of sectors to be read in advance (read-ahead) during data input
Like DEVICE, DEVICEHIGH is used in the CONFIG.SYS file to tell DOS which
driver software to use for devices; however, this option is used to
device driver into the upper memory area.
XCOPY [d:][path]filename [d:][path][filename] [/A][/D:(date)]
Copies directories, subdirectories, and files.
To be functional, each DOS command must be entered in a particular way:
command entry structure is known as the command's "syntax." The syntax
"notation" is a way to reproduce the command syntax in print.
For example, you can determine the items that are optional, by looking
information that is printed inside square brackets. The notation [d:],
example, indicates an optional drive designation. The command syntax, on
other hand, is how YOU enter the command to make it work.
Command Syntax Elements
1. Command Name
The DOS command name is the name you enter to start the DOS program (a
the DOS commands can be entered using shortcut names). The DOS command
always entered first. In this book, the command is usually printed in
letters, but you can enter command names as either lowercase or uppercase
mix of both.
Always leave a space after the command name.
3. Drive Designation
The drive designation (abbreviated in this book as "d:") is an option for
DOS commands. However, some commands are not related to disk drives and
therefore do not require a drive designation. Whenever you enter a DOS
that deals with disk drives and you are already working in the drive in
question, you do not have to enter the drive designator. For example, if
are working in drive A (when the DOS prompt A> is showing at the left
the screen) and you want to use the DIR command to display a directory
of that same drive, you do not have to enter the drive designation. If
not enter a drive designation, DOS always assumes you are referring to
you are currently working in (sometimes called the "default" drive).
4. A Colon
When referring to a drive in a DOS command, you must always follow the
designator with a colon (:) (this is how DOS recognizes it as a drive
A pathname (path) refers to the path you want DOS to follow in order to
the DOS command. As described in Chapter 3, it indicates the path from
current directory or subdirectory to the files that are to be acted upon.
A filename is the name of a file stored on disk. As described in Chapter
filename can be of eight or fewer letters or other legal characters.
7. Filename Extension
A filename extension can follow the filename to further identify it. The
extension follows a period and can be of three or fewer characters. A
extension is not required.
Characters shown in a command syntax that are represented by a letter or
and preceded by a forward slash (for example, "/P") are command options
(sometimes known as "switches"). Use of these options activate special
operations as part of a DOS command's functions.
Items enclosed in square brackets are optional; in other words, the
work in its basic form without entering the information contained inside
Ellipses (...) indicate that an item in a command syntax can be repeated
times as needed.
11. Vertical Bar
When items are separated by a vertical bar (|), it means that you enter
the separated items. For example: ON | OFF means that you can enter
or OFF, but not both.