Perl语言入门 原书第6版PDF|Epub|txt|kindle电子书版本网盘下载

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1．Introduction1

Questions and Answers1

Is This the Right Book for You?1

Why Are There So Many Footnotes?2

What About the Exercises and Their Answers?3

What Do Those Numbers Mean at the Start of the Exercise?4

What If I'm a Perl Course Instructor?4

What Does"Perl"Stand For?4

Why Did Larry Create Perl?5

Why Didn't Larry Just Use Some Other Language?5

Is Perl Easy or Hard?6

How Did Perl Get to Be So Popular?7

What's Happening with Perl Now?7

What's Perl Really Good For?8

What Is Perl Not Good For?8

How Can I Get Perl?9

What Is CPAN?10

How Can I Get Support for Perl?10

Are There Any Other Kinds of Support?10

What If I Find a Bug in Perl?12

How Do I Make a Perl Program?12

A Simple Program13

What's Inside That Program?15

How Do I Compile My Perl Program?16

A Whirlwind Tour of Perl17

Exercises18

2．Scalar Data21

Numbers21

All Numbers Have the Same Format Internally22

Floating-Point Literals22

Integer Literals22

Nondecimal Integer Literals23

Numeric Operators23

Strings24

Single-Quoted String Literals25

Double-Quoted String Literals25

String Operators26

Automatic Conversion Between Numbers and Strings27

Perl's Built-in Warnings28

Scalar Variables29

Choosing Good Variable Names30

Scalar Assignment31

Binary Assignment Operators31

Output with print32

Interpolation of Scalar Variables into Strings32

Creating Characters by Code Point34

Operator Precedence and Associativity34

Comparison Operators36

The if Control Structure37

Boolean Values38

Getting User Input39

The chomp Operator39

The while Control Structure40

The undef Value41

The defined Function42

Exercises42

3．Lists and Arrays43

Accessing Elements of an Array44

Special Array Indices45

List Literals46

The qw Shortcut46

List Assignment48

The pop and push Operators49

The shift and unshift Operators50

The splice Operator50

Interpolating Arrays into Strings51

The foreach Control Structure53

Perl's Favorite Default:$_54

The reverse Operator54

The sort Operator54

The each Operator55

Scalar and List Context55

Using List-Producing Expressions in Scalar Context57

Using Scalar-Producing Expressions in List Context58

Forcing Scalar Context59

＜STDIN＞in List Context59

Exercises60

4．Subroutines63

Defining a Subroutine63

Invoking a Subroutine64

Return Values64

Arguments66

Private Variables in Subroutines68

Variable-Length Parameter Lists69

A Better＆max Routine69

Empty Parameter Lists70

Notes on Lexical(my)Variables71

The use strict Pragma72

The return Operator74

Omitting the Ampersand74

Non-Scalar Return Values76

Persistent,Private Variables76

Exercises78

5．Input and Output81

Input from Standard Input81

Input from the Diamond Operator83

The Invocation Arguments85

Output to Standard Output86

Formatted Output with printf89

Arrays and printf90

Filehandles91

Opening a Filehandle93

Binmoding Filehandles95

Bad Filehandles96

Closing a Filehandle96

Fatal Errors with die97

Warning Messages with warn99

Automatically die-ing99

Using Filehandles100

Changing the Default Output Filehandle100

Reopening a Standard Filehandle101

Output with say102

Filehandles in a Scalar103

Exercises104

6．Hashes107

What Is a Hash?107

Why Use a Hash?109

Hash Element Access110

The Hash As a Whole112

Hash Assignment113

The Big Arrow114

Hash Functions115

The keys and values Functions115

The each Function116

Typical Use of a Hash118

The exists Function118

The delete Function118

Hash Element Interpolation119

The ％ENV hash119

Exercises120

7．In the World of Regular Expressions121

What Are Regular Expressions?121

Using Simple Patterns122

Unicode Properties123

About Metacharacters123

Simple Quantifiers124

Grouping in Patterns125

Alternatives127

Character Classes128

Character Class Shortcuts129

Negating the Shortcuts131

Exercises131

8．Matching with Regular Expressions133

Matches with m//133

Match Modifiers134

Case-Insensitive Matching with/i134

Matching Any Character with/s134

Adding Whitespace with/x135

Combining Option Modifiers135

Choosing a Character Interpretation136

Other Options138

Anchors138

Word Anchors140

The Binding Operator=～141

Interpolating into Patterns142

The Match Variables143

The Persistence of Captures144

Noncapturing Parentheses145

Named Captures146

The Automatic Match Variables147

General Quantifiers149

Precedence150

Examples of Precedence151

And There's More152

A Pattern Test Program152

Exercises153

9．Processing Text with Regular Expressions155

Substitutions with s///155

Global Replacements with/g156

Different Delimiters157

Substitution Modifiers157

The Binding Operator157

Nondestructive Substitutions157

Case Shifting158

The split Operator159

The join Function160

m//in List Context161

More Powerful Regular Expressions161

Nongreedy Quantifiers162

Matching Multiple-Line Text164

Updating Many Files164

In-Place Editing from the Command Line166

Exercises168

10．More Control Structures169

The unless Control Structure169

The else Clause with unless170

The until Control Structure170

Expression Modifiers171

The Naked Block Control Structure172

The elsif Clause173

Autoincrement and Autodecrement174

The Value of Autoincrement175

The for Control Structure176

The Secret Connection Between foreach and for178

Loop Controls178

The last Operator179

The next Operator179

The redo Operator181

Labeled Blocks182

The Conditional Operator?:182

Logical Operators184

The Value of a Short Circuit Operator184

The defined-or Operator185

Control Structures Using Partial-Evaluation Operators186

Exercises188

11．Perl Modules189

Finding Modules189

Installing Modules190

Using Your Own Directories191

Using Simple Modules193

The File::Basename Module194

Using Only Some Functions from a Module195

The File::Spec Module196

Path::Class197

CGI.pm198

Databases and DBI199

Dates and Times200

Exercises201

12．File Tests203

File Test Operators203

Testing Several Attributes of the Same File207

Stacked File Test Operators208

The stat and lstat Functions210

The localtime Function211

Bitwise Operators212

Using Bitstrings213

Exercises214

13．Directory Operations215

Moving Around the Directory Tree215

Globbing216

An Alternate Syntax for Globbing217

Directory Handles218

Recursive Directory Listing220

Manipulating Files and Directories221

Removing Files221

Renaming Files223

Links and Files224

Making and Removing Directories229

Modifying Permissions230

Changing Ownership231

Changing Timestamps231

Exercises232

14．Strings and Sorting235

Finding a Substring with index235

Manipulating a Substring with substr236

Formatting Data with sprintf238

Using sprintf with"Money Numbers"238

Interpreting Non-Decimal Numerals240

Advanced Sorting240

Sorting a Hash by Value244

Sorting by Multiple Keys245

Exercises246

15．Smart Matching and given-when247

The Smart MaTch Operator247

Smart Match Precedence250

The given Statement251

Dumb Matching254

Using when with Many Items256

Exercises257

16．Process Management259

The system Function259

Avoiding the Shell261

The Environment Variables263

The exec Function263

Using Backquotes to Capture Output264

Using Backquotes in a List Context267

External Processes with IPC::System::Simple268

Processes as Filehandles269

Getting Down and Dirty with Fork271

Sending and Receiving Signals272

Exercises274

17．Some Advanced Perl Techniques277

Slices277

Array Slice279

Hash Slice281

Trapping Errors282

Using eval282

More Advanced Error Handling286

autodie288

Picking Items from a List with grep289

Transforming Items from a List with map290

Fancier List Utilities291

Exercises293

A．Exercise Answers295

B．Beyond the Llama331

C．A Unicode Primer343

Index353