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Chapter 2. Command Syntax Using the DIR Command with Parameters and Wildcards. Overview. Will learn to read a syntax diagram and explain the function of each part of the diagram. Overview. Will learn some basic commands, their syntax, and how to make commands more specific. Overview. - PowerPoint PPT Presentation
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Ch 2 1
Command SyntaxUsing the DIR Command with
Parameters and Wildcards
Ch 2 2
OverviewOverview
Will learn to read a syntax diagram and explain the function of each
part of the diagram.
Ch 2 3
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.
Ch 2 11
Command SyntaxCommand SyntaxTo communicate with computer at command line prompt:
Learn its language (commands) Follow its syntax (word order) Use correct punctuation
Ch 2 12
Command SyntaxCommand Syntax
The graphical user interface in Windows operating system
uses syntax and rules.
Ch 2 13
What Are Parameters?What Are Parameters?
Parameter: Information to modify or
qualify a command
Ch 2 14
What Are Parameters?What Are Parameters?
Parameters can be: Variable Fixed
Ch 2 15
What Are Parameters?What Are Parameters?
Variable parameter: x + y = z
Ch 2 16
What Are Parameters?What Are Parameters?
Fixed parameter: x + 5 = z
Ch 2 17
Reading a Reading a Syntax DiagramSyntax Diagram
Command line interface language has: Vocabulary (commands) Grammar (punctuation) Syntax (order)
Ch 2 18
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]
Ch 2 19
Using Fixed Parameters Using Fixed Parameters with the DIR Commandwith the DIR Command
Fixed parameter: Referred to as a switch. Begins with / (the slash).
Ch 2 20
Using Fixed Parameters Using Fixed Parameters with the DIR Commandwith the DIR Command
Slash = forward slash (/).
\ = Backslash.
Ch 2 21
Using Fixed Parameters Using Fixed Parameters with the DIR Commandwith the DIR Command
DIR command with /P parameter displays one screen
of information at a time.
Ch 2 22
Using Fixed Parameters Using Fixed Parameters with the DIR Commandwith the DIR Command
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
Ch 2 23
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
Ch 2 24
Using File Names as Using File Names as Variable ParametersVariable Parameters
File specification (name) consists of: File name File extension
Ch 2 25
Using File Names as Using File Names as Variable ParametersVariable Parameters
Conventions 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.
Ch 2 26
Using File Names as Using File Names as Variable ParametersVariable Parameters
File name reflects subject of file.
File extension usually given by application creating file.
Ch 2 27
Using File Names as Using File Names as Variable ParametersVariable Parameters
When naming files, many older 16-bit application packages
adhere to older 8.3 DOS rules.
Ch 2 28
Using File Names as Using File Names as Variable ParametersVariable Parameters
Can locate specific file by using file name.
Give DIR command information about file you seek:
DIR [drive:] [path] [filename] [/P] [/W]
Ch 2 29
Using File Names as Using File Names as Variable ParametersVariable Parameters
In some syntax diagrams you will see:
[filename[.ext]]
If a file name has an extension, it must be included.
Ch 2 30
Using File Names as Using File Names as Variable ParametersVariable Parameters
A dot (.), delimiter, is used between file name and file extension.
Example: MYFILE.TXT
Ch 2 31
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 parameterHow 8.3 name derived from LFNReasons for keeping file names short/concise
Ch 2 32
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
Ch 2 33
Command Line EditingCommand Line EditingTable 2.1 Editing Keys Command Summary p. 53Table 2.1 Editing Keys Command Summary p. 53
Ch 2 34
Command Line EditingCommand Line EditingTable 2.1 Editing Keys Command Summary p. 53Table 2.1 Editing Keys Command Summary p. 53
Ch 2 35
Command Line EditingCommand Line EditingTable 2.1 Editing Keys Command Summary p. 53Table 2.1 Editing Keys Command Summary p. 53
Ch 2 36
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
Ch 2 37
Drives as Device NamesDrives as Device Names
Device is a place to read information from/to.
Ch 2 38
Drives as Device NamesDrives as Device Names
Disk drives have assigned device names.
Ch 2 39
DefaultsDefaultsDefault: Implied instructions Value used unless another value
is specified
Ch 2 40
DefaultsDefaultsAs an example, when A: \ > is displayed on screen it is the:
Prompt Default drive Designated or logged drive
Ch 2 41
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
Ch 2 42
Brief Introduction to Brief Introduction to Subdirectories—The PathSubdirectories—The Path
Subdirectories: Used primarily on hard disks
Ch 2 43
Brief Introduction to Brief Introduction to Subdirectories—The PathSubdirectories—The Path
Subdirectories permit the . . . grouping of files by type. disk to be divided into smaller
more manageable sections.
Ch 2 44
Brief Introduction to Brief Introduction to Subdirectories—The PathSubdirectories—The Path
Ch 2 45
Brief Introduction to Brief Introduction to Subdirectories—The PathSubdirectories—The Path
Root directory: Created and named by OS when
disk is formatted Indicated by the backslash (\)
Ch 2 46
Brief Introduction to Brief Introduction to Subdirectories—The PathSubdirectories—The Path
Other subdirectories created and named by user.
Naming rules same as rules for naming files.
Ch 2 47
Brief Introduction to Brief Introduction to Subdirectories—The PathSubdirectories—The Path
First backslash - root directory
Following backslashes – delimiters.
Ch 2 48
Brief Introduction to Brief Introduction to Subdirectories—The PathSubdirectories—The Path
Path: Route followed by OS to locate,
save, and/or retrieve a file Subdirectory name
Ch 2 49
Brief Introduction to Brief Introduction to Subdirectories—The PathSubdirectories—The Path
Fig 2.1 File Cabinets and Subdirectories p.63Fig 2.1 File Cabinets and Subdirectories p.63
Ch 2 50
Activity—Using Path with Activity—Using Path with the DIR Commandthe DIR Command
KEY CONCEPTS: Delimiter for path names Backslash (first and others)
Ch 2 51
Changing DefaultsChanging DefaultsDefault drive can be changed.
Command line is not case sensitive.
Ch 2 52
Activity—Changing Activity—Changing the Default Drivethe Default Drive
KEY CONCEPTS: Changing default Locating file not in default directory C:\ - major subdirectory
Ch 2 53
Changing DirectoriesChanging Directories
Default directory can be changed.
Ch 2 54
Changing DirectoriesChanging Directories
Partial command syntax: CD [/D][Drive:][path]
Ch 2 55
Changing DirectoriesChanging Directories
CD with no parameters - current default directory.
CD followed by path name - change default.
/D parameter - change drive and directory.
Ch 2 56
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
Ch 2 57
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
Ch 2 58
Global File Specifications: Global File Specifications: Wildcards, the ?, and *Wildcards, the ?, and *
* - represents a group of characters.
? - represents a single character.
Ch 2 59
Activity—DIR and Activity—DIR and WildcardsWildcards
KEY CONCEPTS: Locating files with insufficient data Using * and *.* Using ? and ??? Using *.SYS
Ch 2 60
RedirectionRedirection
Keyboard: Standard input device
Screen: Standard output device
Ch 2 61
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
Ch 2 62
RedirectionRedirection
Redirection syntax command: COMMAND > DESTINATION
(Space required on both sides of >)
Ch 2 63
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
Ch 2 64
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.
Ch 2 65
Redirecting OutputRedirecting Output to the Printer to the Printer
Printers device names: PRN, LPT1, LPT2 and sometimes
LPT3.
Ch 2 66
Activity—Redirecting the Activity—Redirecting the Output to the PrinterOutput to the Printer
KEY CONCEPTS: Redirection Hardware solutions
Ch 2 67
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
Ch 2 68
Getting HelpGetting Help
Documentation: Reference manual that comes
with any software package
Ch 2 69
Getting HelpGetting Help In DOS 6.0 and above,
documentation provided less in written form and more
online.
Ch 2 70
Getting HelpGetting Help
For help in DOS environment: Key in command, then a space,
forward slash, and question mark Use HELP followed by command
name
Ch 2 71
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