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Index: H

-h (help) command-line switch: 19.1.3. Switches

h2xs utility: 21.3.1. XS and XSUBs

21.3.2. Creating Extensions
h2xs: 22.3. Creating CPAN Modules

overload: 13.1. The overload Pragma

13.2. Overload Handlers
missing: 13.5. When an Overload Handler Is Missing (nomethod and fallback)

overloading, as_string handler: 13.3. Overloadable Operators

for signals: 16.1. Signals

handles: 1.2.1. Variable Syntax

directories: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

references to: 8.2.4. Handle References

tied, base class definitons for: 32.1.14. Convenient Classes

hard links, filenames: 29.2.85. link

hard references: 3.2. The Arrow Operator

8.1. What Is a Reference?

8.2. Creating References

%SIG array: 16.1. Signals

using: 8.3. Using Hard References

closures: 8.3.7. Closures

hardware drivers, Perl modules for interacting with: 22.1. The CPAN modules Directory

hashDepth option (debugger): 20.3.3. Debugger Options

hashes: 1.2.1. Variable Syntax

1.2.1.2. Pluralities

1.2.1.2.2. Hashes.

2.3. Built-in Data Types

2.9. Hashes

printing out in sorted order: 4.4.3. foreach Loops

anonymous

data structure for objects: 12.7. Managing Instance Data
references to: 12.4. Object Construction

anonymous, references to: 8.2.2.2. The anonymous hash composer

binding DBM files to: 29.2.22. dbmopen

cascading conditionals, using instead of: 4.5.1. Case Structures

of complex records: 9.6.3. Generation of a Hash of Complex Records

deleting values from: 29.2.24. delete

elements, giving temporary values to: 29.2.87. local

exists function and: 29.2.34. exists

flat lookup tables, providing access to: 9. Data Structures

HV (hash value) typedef in C: 21.2. Internal Data Types

%INC for modules: 11.1. Using Modules

initializing with x operator: 3.7. Multiplicative Operators

instead of linear searches: 24.2.1. Time Efficiency

inverting: 29.2.132. reverse

keys, finding number in: 2.9. Hashes

keys, returning list of: 29.2.79. keys

key/value pair precedence: 2.9. Hashes

key/value pairs: 2.3. Built-in Data Types

2.9. Hashes
capturing from string with m//g operator: 5.2.2. The m// Operator (Matching)

key/value pairs in: 1.2.1.2.2. Hashes.

multidimensional: 9.4. Hashes of Hashes

accessing and printing: 9.4.3. Access and Printing of a Hash of Hashes
generation of: 9.4.2. Generation of a Hash of Hashes

names for: 2.4. Variables

of arrays: 9.2. Hashes of Arrays

9.3. Arrays of Hashes

access and printing of: 9.2.3. Access and Printing of a Hash of Arrays

generating: 9.2.2. Generation of a Hash of Arrays

9.3.2. Generation of an Array of Hashes

output style, changing in debugger: 20.3.3. Debugger Options

passing by reference into or out of functions: 6.3. Passing References

Perl data organization in: 9.1.5. Common Mistakes

processing, functions for: 29.1. Perl Functions by Category

references as keys: 8.5.1. References Don't Work as Hash Keys

references to: 8.1. What Is a Reference?

restricted, implementing: 12.7.5. Using Closures for Private Objects

returning key/value pairs: 29.2.30. each

returning values of: 29.2.194. values

%SIG, references to signal handlers: 16.1. Signals

symbol tables: 10.1. Symbol Tables

key/value pairs in: 10.1. Symbol Tables
typeglobs in: 10.1. Symbol Tables

taint in: 23.1. Handling Insecure Data

tying: 14. Tied Variables

14.3. Tying Hashes
methods for: 14.3.1. Hash-Tying Methods
Tie::Hash module, providing base class definitions: 32.1.14. Convenient Classes

(see also modules)

headers, format names: 7.2. Footers

here documents: 2.6.6. "Here" Documents

indentation of: 2.6.6. "Here" Documents
semicolon (;), omitting trailing: 24.1.1. Universal Blunders

hex function: 29.2.73. hex

converting numbers to: 5.2.3. The s/// Operator (Substitution)

hexadecimal characters: 2.6.1. Numeric Literals

hexadecimal numbers: 29.2.73. hex

character numbers, specifying as: 5.3.2. Specific Characters

hints, compiler: 28.2. Special Variables in Alphabetical Order

history, command: 20.1. Using the Debugger

history of Perl: 27.1. History Made Practical

home directory: 29.2.9. chdir

home page, Perl: 0.6.1. Perl on the Web

HOME variable: 19.2. Environment Variables

hostnames

getting from network addresses: 29.2.47. gethostbyaddr

Sys::Hostname module: 32.1.7. Operating System Interfaces

translating to addresses: 29.2.48. gethostbyname

29.2.52. getnetbyname

hosts file (see /etc/hosts file)

hosts (remote), checking for reachability: 32.1.8. Networking and Interprocess Communication

household appliances, Perl modules for: 22.1. The CPAN modules Directory

HTML

CGI module, generation of: 32.1.9. World Wide Web
code, producing nicely formatted: 32.1.9. World Wide Web
Perl modules for: 22.1. The CPAN modules Directory
pod files, converting to: 32.1.16. Documentation Support

HTTP

cookies, setting and getting: 32.1.9. World Wide Web
links, searching for: 1.7. Regular Expressions
Perl modules for: 22.1. The CPAN modules Directory

HV (internal hash value): 21.2. Internal Data Types

- (hyphen): 3.10. Named Unary and File Test Operators

5.9.4. The Little Engine That /Could(n't)?/

arithmetic negation operator: 3.5. Ideographic Unary Operators

in character ranges: 5.4.1. Custom Character Classes

character set subtraction: 5.4.3.4. Defining your own character properties

in debugger commands: 20.2.5. Locating Code

-*- for emacs: 19.1. Command Processing

-= (assignment) operator: 3.17. Assignment Operators

-- (autodecrement) operator: 1.5.4. Unary Arithmetic Operators

3.3. Autoincrement and Autodecrement

-> (arrow) operator: 3.2. The Arrow Operator

8.3.3. Using the Arrow Operator
method invocation with: 12.3.1. Method Invocation Using the Arrow Operator

subtractive operator: 3.8. Additive Operators

hyphenating text, Perl module for: 22.1. The CPAN modules Directory

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