Ch 21 Command Syntax Using the DIR Command with Parameters and Wildcards.

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Command SyntaxUsing the DIR Command with

Parameters and Wildcards

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OverviewOverview

Will learn to read a syntax diagram and explain the function of each

part of the diagram.

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OverviewOverview

Will learn some basic commands, their syntax, and

how to make commands more specific.

Ch 2 4

OverviewOverview

Will be able to define prompts and explain how they are

used.

Ch 2 5

OverviewOverview

The purpose and function of defaults will be explained.

Ch 2 6

OverviewOverview

Will learn how to change the default drive and directory.

Ch 2 7

OverviewOverview

Will learn how to use subdirectories and wildcards

with the DIR command.

Ch 2 8

OverviewOverview

The purpose and function of redirection will be explained and then will learn how to redirect the output of the DIR

command to a file or a printer.

Ch 2 9

OverviewOverview

Will learn to use the Online Help feature.

Ch 2 10

Command SyntaxCommand Syntax

All languages have rules or conventions for speaking

and writing.

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To communicate with computer at command line prompt:

Learn its language (commands) Follow its syntax (word order) Use correct punctuation

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The graphical user interface in Windows operating system

uses syntax and rules.

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What Are Parameters?What Are Parameters?

Parameter: Information to modify or

qualify a command

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Parameters can be: Variable Fixed

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Variable parameter: x + y = z

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Fixed parameter: x + 5 = z

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Reading a Reading a Syntax DiagramSyntax Diagram

Command line interface language has: Vocabulary (commands) Grammar (punctuation) Syntax (order)

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Reading a Reading a Syntax DiagramSyntax Diagram

DIR command syntax used earlier:

DIR [drive:] [path] [filename] [/A [[:] attributes]] [/B] [/C] [/D] [/L] [/N] [/O[[:] sortorder]] [/P] [/Q] [/S] [/T[[:] timefield]] [/W] [/X] [4]

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Using Fixed Parameters Using Fixed Parameters with the DIR Commandwith the DIR Command

Fixed parameter: Referred to as a switch. Begins with / (the slash).

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Slash = forward slash (/).

\ = Backslash.

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DIR command with /P parameter displays one screen

of information at a time.

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Notes for lab activities: Check notes at beginning of each activity At end of work session return to Windows

desktop and follow shut-down procedure Know your laboratory procedures If system varies from text refer to the

Configuration Table in Chapter 1.6

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Activity—Using Fixed Activity—Using Fixed Parameters with DIR CommandParameters with DIR Command

KEY CONCEPTS: Clear Screen Display directory using:

/P parameter /W parameter /P /W parameters

Delimiter

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Using File Names as Using File Names as Variable ParametersVariable Parameters

File specification (name) consists of: File name File extension

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Using File Names as Using File Names as Variable ParametersVariable ParametersConventions for Naming Files

All files in directory (subdirectory) must have unique names.

File names - mandatory - may be less than but no longer than 256 characters

File extensions - usually three characters long. Following characters illegal - may NOT be used in

file name: \ / : * ? < > | All other characters, including periods and spaces, are

legal in Windows file names.

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File name reflects subject of file.

File extension usually given by application creating file.

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When naming files, many older 16-bit application packages

adhere to older 8.3 DOS rules.

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Can locate specific file by using file name.

Give DIR command information about file you seek:

DIR [drive:] [path] [filename] [/P] [/W]

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In some syntax diagrams you will see:

[filename[.ext]]

If a file name has an extension, it must be included.

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A dot (.), delimiter, is used between file name and file extension.

Example: MYFILE.TXT

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Activity—Using a File Name Activity—Using a File Name as a Variable Parameteras a Variable Parameter

KEY CONCEPTS: System messages DIR command with long file names File extensions - more than 3 characters 8.3 file name Use of quotation marks Use of /x parameter How 8.3 name derived from LFN Reasons for keeping file names short/concise

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Command Line EditingCommand Line Editing

Can reuse last command keyed in without rekeying it: <F1> - recalls one letter at a time <F3> - recalls entire command line

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Command Line EditingCommand Line EditingTable 2.1 Editing Keys Command Summary p. 53Table 2.1 Editing Keys Command Summary p. 53

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Activity—Using Activity—Using Command EditingCommand Editing

KEY CONCEPT: Use editing keys to recall and edit commands Overstrike mode Insert mode Delete line quickly by using <Esc> key How to search for previously entered command

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Drives as Device NamesDrives as Device Names

Device is a place to read information from/to.

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Drives as Device NamesDrives as Device Names

Disk drives have assigned device names.

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DefaultsDefaults

Default: Implied instructions Value used unless another value

is specified

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DefaultsDefaults

As an example, when A: \ > is displayed on screen it is the:

Prompt Default drive Designated or logged drive

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Activity—Working Activity—Working with the Defaultwith the Default

KEY CONCEPTS: “Shelling out to DOS” Using Default drive Determining drive to be searchedWhy DIR A: HELLO TXT is a very

clear request

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Brief Introduction to Brief Introduction to Subdirectories—The PathSubdirectories—The Path

Subdirectories: Used primarily on hard disks

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Subdirectories permit the . . . grouping of files by type. disk to be divided into smaller

more manageable sections.

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Root directory: Created and named by OS when

disk is formatted Indicated by the backslash (\)

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Other subdirectories created and named by user.

Naming rules same as rules for naming files.

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First backslash - root directory

Following backslashes – delimiters.

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Path: Route followed by OS to locate,

save, and/or retrieve a file Subdirectory name

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Fig 2.1 File Cabinets and Subdirectories p.63Fig 2.1 File Cabinets and Subdirectories p.63

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Activity—Using Path with Activity—Using Path with the DIR Commandthe DIR Command

KEY CONCEPTS: Delimiter for path names Backslash (first and others)

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Changing DefaultsChanging DefaultsDefault drive can be changed.

Command line is not case sensitive.

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Activity—Changing Activity—Changing the Default Drivethe Default Drive

KEY CONCEPTS: Changing default Locating file not in default directory C:\ - major subdirectory

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Changing DirectoriesChanging Directories

Default directory can be changed.

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Partial command syntax: CD [/D][Drive:][path]

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CD with no parameters - current default directory.

CD followed by path name - change default.

/D parameter - change drive and directory.

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Activity—Changing Activity—Changing DirectoriesDirectories

KEY CONCEPTS:Results of keying in

CD alone - display current default directory

CD followed by path - will change default directory

CD \ - will always return to root directory

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Global File Specifications: Global File Specifications: Wildcards, the ?, and *Wildcards, the ?, and *

Global file specifications (wildcards): Can operate on group of files

instead of just a single file

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Global File Specifications: Global File Specifications: Wildcards, the ?, and *Wildcards, the ?, and *

* - represents a group of characters.

? - represents a single character.

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Activity—DIR and Activity—DIR and WildcardsWildcards

KEY CONCEPTS: Locating files with insufficient data Using * and *.* Using ? and ??? Using *.SYS

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RedirectionRedirection

Keyboard: Standard input device

Screen: Standard output device

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RedirectionRedirectionRedirection: Changes output from monitor to

somewhere else (usually file or printer) To work with printer must be local

printer Works only with commands that write

to standard output

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RedirectionRedirection

Redirection syntax command: COMMAND > DESTINATION

(Space required on both sides of >)

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Activity—Redirecting Activity—Redirecting Output to a FileOutput to a File

KEY CONCEPTS: Redirecting output to a file Redirection is “instead of” procedureDealing with write-protected disks

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Redirecting OutputRedirecting Outputto the Printerto the Printer

Can redirect computer output to a file or to a printer.

To redirect to printer need a local printer.

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Redirecting OutputRedirecting Output to the Printer to the Printer

Printers device names: PRN, LPT1, LPT2 and sometimes

LPT3.

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Activity—Redirecting the Activity—Redirecting the Output to the PrinterOutput to the Printer

KEY CONCEPTS: Redirection Hardware solutions

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Activity—Redirecting the Activity—Redirecting the Output to the PrinterOutput to the Printer

Fig 2.2 Redirected Output p.79Fig 2.2 Redirected Output p.79

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Getting HelpGetting Help

Documentation: Reference manual that comes

with any software package

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In DOS 6.0 and above, documentation provided less

in written form and more online.

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For help in DOS environment: Key in command, then a space,

forward slash, and question mark Use HELP followed by command

name

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Activity—Getting Help Activity—Getting Help with a Commandwith a Command

KEY CONCEPT: Results of commands:

? ON O-N S BLP B/L/P

E D

Ch 21 Command Syntax Using the DIR Command with Parameters and Wildcards.

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