Appendix B. Selected DOS Functions

Windows XP can use nearly all of the traditional MS-DOS functions, so knowing something about DOS is still useful. Table B.1 contains a partial list of DOS functions. The ones I find most useful are in boldface. For more information on any specific command, type HELP followed by the command name while at the operating system command prompt. You can get to the operating system command prompt from the AutoCAD command line by typing SHELL

Selected DOS Functions

Table B.1. Selected DOS Functions

SELECTED DOS FUNCTIONS

PURPOSE

ASSOC

Displays or modifies file extension associations.

AT

Schedules commands and programs to run on a computer.

ATTRIB

Displays or changes file attributes.

BREAK

Sets or clears extended Ctrl-C checking.

CALL

Calls one batch program from another.

CD

Displays the name of or changes the current directory.

CHCP

Displays or sets the active code page number.

CHDIR

Displays the name of or changes the current directory.

CHKDSK

Checks a disk, and displays a status report. With the/f switch, it may fix errors it finds on any of those old floppy disks you still need to use periodically.

CHKNTFS

Displays or modifies the checking of the disk at boot time.

CLS

Clears the DOS Command window.

CMD

Starts a new instance of the Windows command interpreter.

COLOR

Sets the default console foreground and background colors.

COMP

Compares the contents of two files or sets of files.

COMPACT

Displays or alters the compression of files on NTFS partitions.

CONVERT

Converts FAT volumes to NTFS. You can't convert the current drive.

COPY

Copies one or more files to another location.

DATE

Displays or sets the date.

DEL

Deletes one or more files.

DIR

Displays a list of files and subdirectories in a directory.

DISKCOMP

Compares the contents of two floppy disks.

DISKCOPY

Copies the contents of one floppy disk to another.

DOSKEY

Edits command lines, recalls commands, and creates macros.

ECHO

Displays messages, or turns command echoing on or off.

ENDLOCAL

Ends localization of environment changes in a batch file.

ERASE

Deletes one or more files.

EXIT

Quits the CMD.EXE program (command interpreter).

FC

Compares files, and displays the differences between them.

FIND

Searches for a text string in a file or files.

FINDSTR

Searches for strings in files.

FOR

Runs a specified command for each file in a set of files.

FORMAT

Formats a disk for use with Windows.

FTYPE

Displays or modifies file types used in file-extension associations.

GOTO

Directs the command interpreter to a labeled line in a batch program.

GRAFTABL

Enables Windows to display an extended character set in graphics mode.

HELP

Provides Help information for Windows commands.

IF

Performs conditional processing in batch programs.

LABEL

Creates, changes, or deletes the volume label of a disk.

MD

Creates a directory.

MKDIR

Creates a directory.

MODE

Configures a system device.

MORE

Displays output one screen at a time.

MOVE

Moves one or more files from one directory to another directory.

PATH

Displays or sets a search path for executable files.

PAUSE

Suspends processing of a batch file and displays a message.

PRINT

Prints a text file.

PROMPT

Changes the Windows command prompt.

RD

Removes a directory. The/s switch includes files and subdirectories.

RECOVER

Recovers readable information from a bad or defective disk.

REM

Records comments (remarks) in batch files or CONFIG.SYS.

REN

Renames a file or files.

RENAME

Renames a file or files.

REPLACE

Replaces files.

RMDIR

Removes a directory.

SET

Displays, sets, or removes Windows environment variables.

SETLOCAL

Begins localization of environment changes in a batch file.

SHIFT

Shifts the position of replaceable parameters in batch files.

SORT

Sorts input.

START

Starts a separate window to run a specified program or command.

SUBST

Associates a path on the local computer with a drive letter.

TIME

Displays or sets the system time.

TITLE

Sets the window title for a CMD.EXE session.

TREE

Graphically displays the directory structure of a drive or path.

TYPE

Displays the contents of a text file.

VER

Displays the Windows version.

VERIFY

Tells Windows to verify that your files are written correctly to a disk.

VOL

Displays a disk volume label and serial number.

XCOPY

Copies files and directory trees, including by date created.

There are other commands and symbols you should know, including a group of network-based commands. The most useful to me are shown in Table B.2. For more information on NET commands, do a web search on MS DOS NET command help.

Table B.2. Other DOS Functions and NET Commands

SYMBOLS AND NETWORK FUNCTIONS

PURPOSE

*

This is a wildcard that means all. If you type DIR *.DWG, you get a listing of all files with the extension .dwg. If you type DIR acad.*, you get a listing of all files with the name acad regardless of their extension. If you type DEL *.*, you delete all files in the current directory.

?

This is a wild-card that replaces individual characters in a string. If you typed DIR chapter??, you would get a listing of all files with the name chapter and two other characters, including chapter01, chapter02, and so on.

%username%

This is a replaceable parameter. When used in a batch file, it's automatically replaced with the logon name of the current user of the computer. It's useful in windows icons as well.

Net Send

This command is used to send messages over the network to specific users. Use it to send messages to users as they log on. The syntax is as follows: Net Send davidwood "Please see me." This sends the quoted message to whoever is logged on as davidwood.

Net Use

This command associates a network path with a drive letter. Use this function to assign drive letters to specific network locations when users first log on.

CALCS

This command is used to assign permissions on network folders and files.

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