Perl Core Language Little Black Book

by Holzner, Steven

ISBN13: 9781932111422

ISBN10: 1932111425

Format: Paperback

Pub. Date: 1999-03-01

Publisher(s): Paraglyph Pr

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Summary

This book is one of the most practical and concise guides available for Perl programming. It includes step-by-step solutions on object-oriented programming in Perl. It provides highly referenceable, task-oriented answers to scripting with Perl.

Introduction

xxv

Part I Perl Syntax

Essential Perl

(26)

In Brief

First Things First

(2)

Immediate Solutions

Getting And Installing Perl

(1)

Writing Perl Scripts

(1)

Making Sure Your Script Can Find Perl

(1)

Unix

(1)

MS-DOS

(1)

Windows 95/98 And Windows NT

(1)

Macintosh

(1)

Writing Perl Code: Statements And Declarations

(1)

Running Perl Scripts

(1)

If Your Script Can Find Perl

(1)

If You Want To Use Perl From The Command Line

(2)

Running Perl Scripts Interactively

(2)

Using Command Line Switches

(3)

Using The -w Switch For Warnings

(1)

Handling Text Input And Output With Standard File Handles

(1)

Displaying Text

(1)

Displaying Line Numbers And Script File Names

(1)

Printing Text A Number Of Times

(1)

Basic Text Formatting

(2)

Displaying Unformatted Text: Perl Here Documents

(1)

Commenting Your Code

(1)

Reading Typed Input

(1)

Using The Default Variable $_

(1)

Cleaning Up Typed Input

(1)

Avoiding Immediate Script Closings In Windows 95/98 And NT

(2)

Scalar Variables And Lists

(26)

In Brief

Scalar Variables

(1)

Lists

(2)

Immediate Solutions

What's A Scalar Variable?

(1)

Naming Scalar Variables

(1)

Handling Scalar Assignments

(1)

What's An Ivalue?

(1)

Using Numbers In Scalar Variables

(1)

Working With The Undefined Value: undef

(1)

Declaring A Constant

(1)

Handling Truth Values In Perl

(1)

Converting Between Octal, Decimal, And Hexadecimal

(1)

Hexadecimal To Decimal

(1)

Decimal To Hexadecimal

(1)

Octal To Decimal

(1)

Decimal To Octal

(1)

Rounding Numbers

(1)

Using Strings In Scalar Variables

(1)

Using String Interpolation

(2)

Handling Difficult Interpolations

(2)

Handling Quotes And Barewords

(1)

What's A List?

(1)

Referring To List Elements By Index

(1)

Assigning Lists To Other Lists

(1)

Mapping A List

(1)

Joining A List Into A String

(1)

Splitting A String Into A List

(1)

Sorting Lists

(2)

Reversing A List

(1)

Selecting Elements From A List

(1)

Understanding Scalar And List Contexts

(1)

Forcing Scalar Context

(2)

Arrays And Hashes

(26)

In Brief

Arrays

(1)

Hashes

(1)

Typeglobs

(1)

Immediate Solutions

Creating Arrays

(1)

Using Arrays

(1)

Pushing And Popping Arrays

(1)

Shifting And Unshifting Arrays

(1)

Finding The Length Of Arrays

(1)

Growing Or Shrinking Arrays

(1)

Merging Two Arrays

(1)

Getting Array Slices

(1)

Looping Over Arrays

(2)

Printing Arrays

(1)

Splicing Arrays

(1)

Reversing Arrays

(1)

Sorting Arrays

(1)

Creating Hashes

(2)

Using Hashes

(1)

Adding Elements To Hashes

(1)

Checking If Hash Elements Exist

(1)

Deleting Hash Elements

(1)

Looping Over Hashes

(1)

Printing Hashes

(1)

Sorting Hashes

(1)

Merging Two Hashes

(1)

Using Hashes And Arrays In List Assignments

(1)

Using Typeglobs

(2)

Comparing Typeglobs And Symbol Table Entries

(1)

Operators And Precedence

(24)

In Brief

Operator Precedence

(2)

Immediate Solutions

Highest Precedence: Terms And Leftward List Operators

(1)

Using The Arrow Operator

(1)

Handling Autoincrement And Autodecrement

(1)

Handling Exponentiation

(1)

Using Symbolic Unary Operators

(1)

Using Binding Operators

(1)

Handling Multiplication And Division

(1)

Handling Addition, Subtraction, And Concatenation

(1)

Using The Shift Operators

(1)

Using Named Unary Operators

(1)

Working With File Test Operators

(1)

Using Relational Operators

(2)

Using Equality Operators

(1)

Anding Bitwise Values

(1)

Oring Bitwise Values

(1)

Exclusive Oring Bitwise Values

(1)

Using ``C-Style'' Logical And

(1)

Using ``C-Style'' Logical Or

(1)

Using The Range Operator

(1)

Using The Conditional Operator

100

(1)

Handling Assignments

101

(1)

Using The Comma Operator

101

(1)

Using Rightward List Operators

102

(1)

Using Logical not

102

(1)

Using Logical and

103

(1)

Using Logical or

103

(1)

Using Logical xor

103

(2)

Conditionals And Loops

105

(20)

In Brief

Conditional Statements

106

(1)

Loop Statements

107

(2)

Immediate Solutions

Using The if Statement

109

(1)

Using The unless Statement

110

(1)

Looping Over Elements With for

111

(2)

Looping Over Elements With foreach

113

(2)

Looping Over Elements With while

115

(1)

Looping Over Elements With until

116

(1)

Modifying Statements With if, unless, until, And while

117

(1)

Creating A do while Loop

118

(1)

Skipping To The Next Loop Iteration With next

118

(1)

Ending A Loop With The last Command

119

(1)

Redoing Iterations With The redo Loop Command

120

(1)

Creating A switch Statement

121

(1)

Using goto

122

(1)

Executing Code With The eval Function

123

(1)

Ending A Program With The exit Statement

123

(1)

Using The die Statement

124

(1)

Regular Expressions

125

(24)

In Brief

Using Regular Expressions

126

(3)

Immediate Solutions

Creating Regular Expressions

129

(1)

Using Characters In Regular Expressions

130

(1)

Matching Any Character

131

(1)

Using Character Classes In Regular Expressions

132

(1)

Using Alternative Match Patterns In Regular Expressions

133

(1)

Using Quantifiers In Regular Expressions

133

(1)

Quantifier ``Greediness''

134

(1)

Using Assertions In Regular Expressions

135

(1)

Using Regular Expression Backreferences To Refer To Previous Matches

136

(1)

Using Regular Expression Extensions

137

(1)

Using Modifiers With m// And s///

138

(1)

Translating Strings With tr///

138

(1)

Using Modifiers With tr///

139

(1)

Matching Words

140

(1)

Matching The Beginning Of A Line

141

(1)

Matching The End Of A Line

141

(1)

Checking For Numbers

141

(1)

Checking For Letters

142

(1)

Finding Multiple Matches

143

(1)

Using Case-Insensitive Matching

144

(1)

Extracting A Substring

144

(1)

Using Function Calls And Perl Expressions In Regular Expressions

145

(1)

Finding The nth Match

145

(1)

Making Quantifiers Less Greedy

146

(1)

Removing Leading And Trailing White Space

147

(1)

Using Assertions To Look Ahead And Behind

147

(2)

Subroutines

149

(22)

In Brief

Working With Subroutines

150

(2)

Immediate Solutions

Declaring Subroutines

152

(1)

Using Prototypes

153

(1)

Defining Subroutines

154

(1)

Calling Subroutines

154

(1)

Reading Arguments Passed To Subroutines

155

(1)

Using A Variable Number Of Arguments

156

(1)

Using Default Argument Values

157

(1)

Returning Values From Subroutines (Functions)

158

(1)

Setting Scope With my

159

(2)

Requiring Lexically Scoped Variables

161

(1)

Creating Temporary Variables With local

161

(1)

Persistent (Static) Variables

162

(2)

Calling Subroutines Recursively

164

(1)

Nesting Subroutines

164

(1)

Passing By Reference

165

(1)

Passing Symbol Table Entries (Typeglobs)

166

(1)

Checking Return Context With wantarray

167

(1)

Creating Inline Functions

168

(1)

Overriding Built-In Functions And Using CORE

168

(1)

Creating Anonymous Subroutines

169

(1)

Creating Subroutine Dispatch Tables

169

(2)

Perl References

171

(22)

In Brief

Hard References

172

(1)

Symbolic References

173

(1)

The Arrow Operator

174

(1)

Anonymous Arrays, Hashes, And Subroutines

174

(1)

Immediate Solutions

Creating A Reference

175

(2)

Creating References To Anonymous Arrays

177

(1)

Creating References To Anonymous Hashes

178

(1)

Creating References To Anonymous Subroutines

178

(1)

Getting References Using The Symbol Table

179

(1)

Dereferencing References

180

(2)

Dereferencing With The Arrow Operator

182

(2)

Omitting The Arrow Operator

184

(1)

Determining The Type Of A Reference With The ref Operator

184

(1)

Creating Symbolic References

185

(1)

Disallowing Symbolic References

186

(1)

Using Array References As Hash References

187

(1)

Creating Persistent Scope Closures In Perl

187

(1)

Creating Functions From Function Templates

188

(5)

Part II Built-In Resources

Built-In Variables

193

(22)

In Brief

English Versions Of The Built-In Variables

195

(2)

Setting The Built-In Variables For Specific File Handles

197

(2)

Immediate Solutions

$' Postmatch String

199

(1)

$- Number Of Lines Left On The Page

199

(1)

$! Current Error

199

(1)

$`` Output Field Separator For Interpolated Array Values

200

(1)

$# Output Format For Printed Numbers

200

(1)

$$ Perl Process Number

200

(1)

$% Current Output Page

200

(1)

$& Last Match

201

(1)

$( Real GID

201

(1)

$) Effective GID

201

(1)

$* Multiline Matching

201

(1)

$, Output Field Separator

202

(1)

$. Current Input Line Number

202

(1)

$/ Input Record Separator

202

(1)

$: String Break Characters

203

(1)

$; Subscript Separator

203

(1)

$? Status Of Last Pipe Close, Backtick Command, Or System Call

204

(1)

$@ Error From Last eval

204

(1)

$[ Array Base

204

(1)

$\ Output Record Separator

204

(1)

$] Perl Version

204

(1)

$^ Current Top-Of-Page Format

205

(1)

$^A Write Accumulator

205

(1)

$^D Current Debugging Flags

205

(1)

$^E OS-Specific Error Information

205

(1)

$^F Maximum System File Descriptor

206

(1)

$^H Current Syntax Checks

206

(1)

$^I Current Inplace-Edit Value

206

(1)

$^L Output Form Feed

206

(1)

$^M Emergency Memory Buffer

206

(1)

$^O Operating System Name

207

(1)

$^P Debugging Support

207

(1)

$^R Result Of Last Regular Expression Assertion

207

(1)

$^S State Of The Interpreter

208

(1)

$^T Time At Which Script Began Running

208

(1)

$^W Current Value Of The Warning Switch

208

(1)

$^X Executable Name

208

(1)

$_ Default Variable

209

(1)

$` Prematch String

209

(1)

$I Output Autoflush

209

(1)

$~ Name Of The Current Report Format

210

(1)

$+ Last Parentheses Match

210

(1)

$< Real UID

210

(1)

$= Current Page Length

211

(1)

$> Effective UID

211

(1)

$O Program Name

211

(1)

$ARGV Name Of Current File

211

(1)

$n Pattern Match n

212

(1)

%ENV Environment Values

212

(1)

%INC Included Files

212

(1)

%SIG Signal Handlers

213

(1)

@_ Subroutine Arguments

213

(1)

@ARGV Command Line Arguments

213

(1)

@INC Location Of Scripts To Evaluate

214

(1)

Built-In Functions: Data Processing

215

(24)

In Brief

Built-In Functions

217

(1)

Immediate Solutions

abs Absolute Value

218

(1)

atan2 Arctangent

218

(1)

chomp Remove Line Endings

218

(1)

chop Remove Last Character

219

(1)

chr Character From Code

219

(1)

cos Cosine

220

(1)

each Hash Key And Value Pairs

220

(1)

eval Evaluate Perl Code

221

(1)

exists Check Hash Key

221

(1)

exp Raise To The Power Of e

221

(1)

hex Convert From Hexadecimal

222

(1)

index Position Of Substring

222

(1)

int Truncate To Integer

222

(1)

join Join List Into A String

223

(1)

keys Hash Keys

223

(1)

lc Lowercase

224

(1)

lcfirst Lowercase First Character

224

(1)

length String Length

224

(1)

log Natural Logarithm

225

(1)

map Evaluate Code For Each Element

225

(1)

oct Convert From Octal

225

(1)

ord ASCII Value

226

(1)

pack Pack Values

226

(1)

pop Pop Array Value

227

(1)

POSIX Functions

228

(1)

push Push Array Value

228

(1)

rand Random Number

229

(1)

reverse Reverse List

229

(1)

rindex Reverse Index

229

(1)

scalar Force Scalar Context

230

(1)

shift Shift Value From Array

230

(1)

sin Sine

230

(1)

sort Sort List

231

(1)

splice Replace Subarray Elements

232

(1)

split Split A String Into An Array Of Strings

232

(1)

sprintf Format String

233

(1)

sqrt Square Root

234

(1)

srand Set Random Number Seed

235

(1)

substr Substring

235

(1)

time Seconds Since January 1, 1970

236

(1)

uc Uppercase

236

(1)

ucfirst Uppercase First Character

236

(1)

unpack Unpack Values

237

(1)

unshift Shift Values Onto Array

237

(1)

values Hash Values

238

(1)

vec Vector Of Unsigned Integers

238

(1)

Built-In Functions: I/O And Interprocess Communication

239

(22)

In Brief

Perl Formats

240

(2)

Immediate Solutions

print Print List Data

242

(1)

printf Print Formatted List Data

243

(1)

Reading Input With <>

244

(1)

getc Get A Character

244

(1)

write Write A Formatted Record

245

(1)

Formats: Left-Justifying Text

245

(1)

Formats: Right-Justifying Text

246

(1)

Formats: Centering Text

246

(1)

Formats: Printing Numbers

246

(1)

Formats: Formatted Multiline Output

247

(1)

Formats: Formatted Multiline Output With Text Slices

247

(1)

Formats: Unformatted Multiline Output

248

(1)

Formats: Top-Of-Form Output

248

(1)

Formats: Using Format Variables

249

(1)

warn Display A Warning

250

(1)

IPC: exec Executing A System Call

251

(1)

IPC: system Forking And Running A System Command

251

(1)

IPC: Reading Data From Another Program

252

(1)

IPC: Sending Data To Another Program

253

(1)

IPC: Writing To A Child Process

253

(1)

IPC: Writing To A Parent Process

254

(1)

IPC: Sending A Signal To Another Process

255

(2)

IPC: Using Sockets

257

(1)

IPC: Win32 OLE Automation

258

(3)

Built-In Functions: File Handling

261

(26)

In Brief

All About File Handling

263

(2)

Immediate Solutions

open Open A File

265

(1)

close Close A File

266

(1)

print Print To A File

267

(1)

write Write To A File

268

(1)

binmode Set Binary Mode

268

(1)

Setting Output Channel Buffering

269

(1)

Reading Files Passed From The Command Line

270

(1)

Reading From A File Handle

270

(1)

read Read Input

271

(1)

readline Read A Line Of Data

271

(1)

getc Get A Character

272

(1)

seek Set The Current Position In A File

272

(1)

tell Get The Current Position In A File

273

(1)

stat File Status

274

(1)

POSIX File Functions

275

(1)

select Setting The Default Output File Handle

276

(1)

eof Test For End Of File

276

(1)

Writing A DBM Database File

277

(1)

Reading A DBM Database File

278

(1)

flock Lock File

279

(1)

chmod Change File Permission

279

(1)

glob Get Matching Files

280

(1)

rename Rename A File

280

(1)

unlink Delete Files

281

(1)

opendir Open A Directory

281

(1)

closedir Close A Directory

281

(1)

readdir Read Directory Entry

282

(1)

seekdir Set Current Position In A Directory

282

(1)

telldir Directory Position

282

(1)

rewinddir Set Directory Position To Beginning

282

(1)

chdir Change Working Directory

283

(1)

mkdir Make A Directory

283

(1)

rmdir Remove A Directory

284

(3)

Part III Perl Programming

Built-In Modules

287

(20)

In Brief

Using Perl Modules

288

(6)

Immediate Solutions

Term::Cap Work With The Terminal

294

(1)

Math: Complex And Big Numbers

295

(1)

POSIX: Portable Operating System Interface

295

(1)

Benchmark: Benchmark Tests

296

(1)

Time: Times And Time Conversions

297

(1)

Carp: Report Errors From Caller's Perspective

297

(1)

locale: Enable Locale-Sensitive Operations

297

(1)

File: File Operations

298

(1)

Net: Internet Access

298

(1)

Safe: Safe Code Compartments

299

(1)

Tk: The Tk Toolkit

299

(1)

Tk: Button And Text Widgets

300

(1)

Tk: Radiobutton And Checkbutton Widgets

300

(1)

Tk: Listbox Widgets

301

(1)

Tk: Scale Widgets

302

(1)

Tk: Canvas Widgets

303

(1)

Tk: Menu Widgets

303

(1)

Tk: Dialog Box Widgets

304

(3)

Data Structures

307

(20)

In Brief

A Good Idea: use strict vars

311

(2)

Immediate Solutions

Complex Records: Storing References And Other Elements

313

(1)

Declaring Arrays Of Arrays

314

(1)

Creating Arrays Of Arrays On The Fly

314

(2)

Accessing Arrays Of Arrays

316

(1)

Declaring Hashes Of Hashes

317

(1)

Creating Hashes Of Hashes On The Fly

318

(1)

Accessing Hashes Of Hashes

319

(1)

Declaring Arrays Of Hashes

320

(1)

Creating Arrays Of Hashes On The Fly

320

(1)

Accessing Arrays Of Hashes

321

(2)

Declaring Hashes Of Arrays

323

(1)

Creating Hashes Of Arrays On The Fly

323

(1)

Accessing Hashes Of Arrays

324

(1)

Linked Lists And Ring Buffers

324

(3)

Creating Packages And Modules

327

(18)

In Brief

Packages

328

(2)

Modules

330

(1)

Immediate Solutions

Creating A Package

331

(1)

Creating A Package Constructor: BEGIN

332

(1)

Creating A Package Destructor: END

333

(1)

Determining The Current Package

334

(1)

Splitting A Package Across File Boundaries

334

(1)

Creating Modules

335

(1)

Exporting Symbols From Modules By Default

336

(1)

OKing Symbols To Export From Modules

337

(1)

Preventing Symbol Importation

337

(1)

Preventing Symbol Exportation

338

(1)

Exporting Without The import Method

339

(1)

Creating Nested Submodules

340

(1)

Checking Module Version Numbers

341

(1)

Autoloading Subroutines In Modules

342

(1)

Using AutoLoader And SelfLoader

343

(2)

Creating Classes And Objects

345

(22)

In Brief

Classes

346

(1)

Objects

347

(1)

Methods

348

(1)

Inheritance

349

(1)

Immediate Solutions

Creating A Class

350

(1)

Creating A Constructor

350

(1)

Creating An Object

351

(1)

Creating A Class Method

351

(1)

Creating An Instance Method

352

(1)

Invoking A Method

352

(1)

Creating An Instance Variable

353

(1)

Creating Private Methods And Variables

354

(1)

Creating A Class Variable

355

(1)

Creating A Destructor

356

(1)

Implementing Class Inheritance

357

(1)

Inheriting Constructors

358

(1)

Inheriting Instance Variables

359

(1)

Multiple Inheritance

360

(1)

Overriding Base Class Methods

361

(1)

Tying Scalars

362

(1)

Tying Arrays

363

(1)

Tying Hashes

364

(1)

Using The Perl UNIVERSAL Class

365

(2)

Perl Debugging And Style Guide

367

(20)

In Brief

A Sample Debugging Session

368

(3)

Immediate Solutions

Trapping Runtime Errors

371

(1)

Starting The Debugger

372

(1)

What Debugger Commands Are Available

373

(3)

Listing Your Code

376

(1)

Single Stepping

377

(1)

Single Stepping Over Subroutine Calls

377

(1)

Setting Breakpoints

378

(1)

Deleting Breakpoints

379

(1)

Continuing To Breakpoint

379

(1)

Printing An Expression

379

(1)

Evaluating An Expression

380

(1)

Changing Values In Variables

380

(1)

Setting Global Watches

380

(1)

Setting Debugger Actions

381

(1)

Quitting The Debugger

381

(1)

Perl Style Guide

382

(5)

Part IV CGI Programming

CGI Programming

387

(22)

In Brief

Using CGI.pm

388

(2)

Creating And Using HTML Controls

390

(7)

Immediate Solutions

Using PerlScript

397

(1)

Starting An HTML Document In CGI

398

(1)

Creating HTML Heads

398

(1)

Centering HTML Elements

399

(1)

Creating A Bulleted List

399

(1)

Creating A Hyperlink

400

(1)

Creating Horizontal Rules

400

(1)

Creating An HTML Form

400

(1)

Working With Text Fields

401

(1)

Reading Data From HTML Controls

401

(1)

Working With Text Areas

402

(1)

Working With Checkboxes

403

(1)

Working With Scrolling Lists

403

(1)

Working With Radio Buttons

404

(1)

Working With Pop-Up Menus

405

(1)

Working With Hidden Data Fields

406

(1)

Creating Submit And Reset Buttons

406

(1)

Ending An HTML Form

407

(1)

Ending An HTML Document

407

(1)

Function-Based CGI Programming

407

(2)

CGI Programming With cgi-lib.pl

409

(20)

In Brief

Using cgi-lib.pl

412

(5)

Immediate Solutions

What Subroutines Does cgi-lib.pl Include?

417

(1)

Starting An HTML Document

418

(1)

Creating HTML Heads

419

(1)

Centering HTML Elements

419

(1)

Creating A Bulleted List

419

(1)

Creating A Hyperlink

420

(1)

Creating Horizontal Rules

420

(1)

Creating An HTML Form

420

(1)

Working With Text Fields

421

(1)

Reading Data From HTML Controls

421

(1)

Working With Text Areas

422

(1)

Working With Checkboxes

422

(1)

Working With Scrolling Lists

423

(1)

Working With Radio Buttons

424

(1)

Working With Pop-Up Menus

424

(1)

Working With Hidden Data Fields

425

(1)

Creating Submit And Reset Buttons

425

(1)

Ending An HTML Form

426

(1)

Ending An HTML Document

426

(1)

Displaying All Variables

426

(3)

CGI: Web Counters, Guest Books, Emailers, And Secure Scripts

429

(20)

In Brief

CGI Security

430

(2)

Immediate Solutions

Taking Security Seriously

432

(1)

Working With Tainted Data

433

(2)

Untainting Data

435

(1)

Giving A CGI Script More Privileges In Unix

436

(1)

Creating A Web Counter

436

(2)

Creating A Guest Book

438

(6)

Emailing From A CGI Script

444

(5)

CGI: Multiuser Chat, Cookies, And Games

449

(22)

In Brief

Chat Applications

450

(1)

450

(1)

A Game

451

(1)

Immediate Solutions

Creating A Multiuser Chat Application

452

(1)

Multiuser Security Issues

452

(1)

Handling Denial Of Service Attacks

453

(1)

Chatting From A Web Browser

454

(1)

Setting An HTML Page's Refresh Rate

454

(1)

Clearing Refreshed HTML Controls

454

(5)

Writing And Reading Cookies

459

(4)

Using Cookies

459

(2)

How To Write A Cookie

461

(1)

How To Read A Cookie

461

(2)

Creating A Game

463

(8)

Storing Data In Web Pages Between Calls To A Script

464

(1)

Customizing This Game

464

(7)

Index

471

Kids

Men

Sweatshirts

Women

For You

For Your Car

For Your Home

For Your Pet

For Your Tech

Artwork

Cooking Essentials

Games

Gift Wraps

Holiday

Home Decor

Mascot

Office Decor

Outdoor/Recreation

Graduation Gear

Graduation Gifts

Art Supplies

For Your Office

Medical Supplies

Office Supplies

School Supplies

Perl Core Language Little Black Book

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eBook

Summary

Table of Contents

Perl Core Language Little Black Book

Rent Book

New Book

Used Book

eBook

Summary

Table of Contents

Digital License