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Index: H

• -h (help) command-line switch: Switches
• h2xs utility: XS and XSUBs
• • Creating Extensions
  • h2xs: Creating CPAN Modules
• • overload: The overload Pragma
  • • Overload Handlers
    • missing: When an Overload Handler Is Missing (nomethod and fallback)
  • overloading, as_string handler: Overloadable Operators
  • for signals: Signals
• handles: Variable Syntax
• • directories: Filehandle, Directory Handle, and Stream I/O Utilities
  • references to: Handle References
  • tied, base class definitons for: Convenient Classes
• hard links, filenames: link
• hard references: The Arrow Operator
• • What Is a Reference?
  • Creating References
  • %SIG array: Signals
  • using: Using Hard References
  • • closures: Closures
• hardware drivers, Perl modules for interacting with: The CPAN modules Directory
• hashDepth option (debugger): Debugger Options
• hashes: Variable Syntax
• • Pluralities
  • Hashes.
  • Built-in Data Types
  • Hashes
  • printing out in sorted order: foreach Loops
  • anonymous
  • • data structure for objects: Managing Instance Data
    • references to: Object Construction
  • anonymous, references to: The anonymous hash composer
  • binding DBM files to: dbmopen
  • cascading conditionals, using instead of: Case Structures
  • of complex records: Generation of a Hash of Complex Records
  • deleting values from: delete
  • elements, giving temporary values to: local
  • exists function and: exists
  • flat lookup tables, providing access to: Data Structures
  • HV (hash value) typedef in C: Internal Data Types
  • %INC for modules: Using Modules
  • initializing with x operator: Multiplicative Operators
  • instead of linear searches: Time Efficiency
  • inverting: reverse
  • keys, finding number in: Hashes
  • keys, returning list of: keys
  • key/value pair precedence: Hashes
  • key/value pairs: Built-in Data Types
  • • Hashes
    • capturing from string with m//g operator: The m// Operator (Matching)
  • key/value pairs in: Hashes.
  • multidimensional: Hashes of Hashes
  • • accessing and printing: Access and Printing of a Hash of Hashes
    • generation of: Generation of a Hash of Hashes
  • names for: Variables
  • of arrays: Hashes of Arrays
  • • Arrays of Hashes
    • access and printing of: Access and Printing of a Hash of Arrays
    • generating: Generation of a Hash of Arrays
    • • Generation of an Array of Hashes
  • output style, changing in debugger: Debugger Options
  • passing by reference into or out of functions: Passing References
  • Perl data organization in: Common Mistakes
  • processing, functions for: Perl Functions by Category
  • references as keys: References Don't Work as Hash Keys
  • references to: What Is a Reference?
  • restricted, implementing: Using Closures for Private Objects
  • returning key/value pairs: each
  • returning values of: values
  • %SIG, references to signal handlers: Signals
  • symbol tables: Symbol Tables
  • • key/value pairs in: Symbol Tables
    • typeglobs in: Symbol Tables
  • taint in: Handling Insecure Data
  • tying: Tied Variables
  • • Tying Hashes
    • methods for: Hash-Tying Methods
    • Tie::Hash module, providing base class definitions: Convenient Classes
• • (see also modules)
• headers, format names: Footers
• here documents: "Here" Documents
• • indentation of: "Here" Documents
  • semicolon (;), omitting trailing: Universal Blunders
• hex function: hex
• • converting numbers to: The s/// Operator (Substitution)
• hexadecimal characters: Numeric Literals
• hexadecimal numbers: hex
• • character numbers, specifying as: Specific Characters
• hints, compiler: Special Variables in Alphabetical Order
• history, command: Using the Debugger
• history of Perl: History Made Practical
• home directory: chdir
• home page, Perl: Perl on the Web
• HOME variable: Environment Variables
• hostnames
• • getting from network addresses: gethostbyaddr
  • Sys::Hostname module: Operating System Interfaces
  • translating to addresses: gethostbyname
  • • getnetbyname
• hosts file (see /etc/hosts file)
• hosts (remote), checking for reachability: Networking and Interprocess Communication
• household appliances, Perl modules for: The CPAN modules Directory
• HTML
• • CGI module, generation of: World Wide Web
  • code, producing nicely formatted: World Wide Web
  • Perl modules for: The CPAN modules Directory
  • pod files, converting to: Documentation Support
• HTTP
• • cookies, setting and getting: World Wide Web
  • links, searching for: Regular Expressions
  • Perl modules for: The CPAN modules Directory
• HV (internal hash value): Internal Data Types
• - (hyphen): Named Unary and File Test Operators
• • The Little Engine That /Could(n't)?/
  • arithmetic negation operator: Ideographic Unary Operators
  • in character ranges: Custom Character Classes
  • character set subtraction: Defining your own character properties
  • in debugger commands: Locating Code
  • -*- for emacs: Command Processing
  • -= (assignment) operator: Assignment Operators
  • -- (autodecrement) operator: Unary Arithmetic Operators
  • • Autoincrement and Autodecrement
  • -> (arrow) operator: The Arrow Operator
  • • Using the Arrow Operator
    • method invocation with: Method Invocation Using the Arrow Operator
  • subtractive operator: Additive Operators
• hyphenating text, Perl module for: The CPAN modules Directory

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