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Index: H

• -h option (perl): Command-Line Options (Perl tutorial)
• h command (CPAN.pm): Reference: h (Perl tutorial)
• h command (debugger): Reference: h (Perl tutorial)
• • for signals: Signals (Developing Perl)
  • overload: The overload Pragma (Developing Perl)
  • • Overload Handlers (Developing Perl)
    • missing: (Developing Perl) 13.5. When an Overload Handler Is Missing (nomethod and fallback)
  • overloading,: Overloadable Operators (Developing Perl)
• handles: Variable Syntax (Developing Perl)
• • directories: Filehandle, Directory Handle, and Stream I/O Utilities (Developing Perl)
  • references to: Handle References (Developing Perl)
  • tied, base class definitons for: Convenient Classes (Developing Perl)
• handling
• • multiple clients: Handling Multiple Clients (Advanced Perl Developing)
  • signals: Signal Handlers (Advanced Perl Developing)
• hard links: Introduction (Perl tutorial)
• hard links, filenames: link (Developing Perl)
• hard references: Reference Counts (Advanced Perl Developing)
• • The Arrow Operator (Developing Perl)
  • What Is a Reference? (Developing Perl)
  • Creating References (Developing Perl)
  • %SIG array: Signals (Developing Perl)
  • using: Using Hard References (Developing Perl)
  • • closures: Closures (Developing Perl)
• hardware drivers, Perl modules for interacting with: The CPAN modules Directory (Developing Perl)
• • • closures: The CPAN modules Directory (Developing Perl)
• hash functions: Inside HVs (Advanced Perl Developing)
• hash prototype symbol (%): Prototypes (Perl tutorial)
• hash values/entries (HVs/HEs): Hash Values (HVs) (Advanced Perl Developing)
• hashDepth option (debugger): Debugger Options (Developing Perl)
• • • closures: Debugger Options (Developing Perl)
• hashes: Variable Syntax (Developing Perl)
• • Pluralities (Developing Perl)
  • Hashes. (Developing Perl)
  • Built-in Data Types (Developing Perl)
  • Hashes (Developing Perl)
  • • closures: Variable Syntax (Developing Perl)
    • • Pluralities (Developing Perl)
      • Hashes. (Developing Perl)
      • Built-in Data Types (Developing Perl)
      • Hashes (Developing Perl)
  • printing out in sorted order: foreach Loops (Developing Perl)
  • anonymous
  • • data structure for objects: Managing Instance Data (Developing Perl)
    • references to: Object Construction (Developing Perl)
    • • The anonymous hash composer (Developing Perl)
  • binding DBM files to: dbmopen (Developing Perl)
  • cascading conditionals, using instead of: Case Structures (Developing Perl)
  • deleting values from: delete (Developing Perl)
  • elements, giving temporary values to: local (Developing Perl)
  • exists function and: exists (Developing Perl)
  • flat lookup tables, providing access to: Data Structures (Developing Perl)
  • HV (hash value) typedef in C: Internal Data Types (Developing Perl)
  • %INC for modules: Using Modules (Developing Perl)
  • initializing with x operator: Multiplicative Operators (Developing Perl)
  • instead of linear searches: Time Efficiency (Developing Perl)
  • inverting: reverse (Developing Perl)
  • keys, finding number in: Hashes (Developing Perl)
  • keys, returning list of: keys (Developing Perl)
  • key/value pair precedence: Hashes (Developing Perl)
  • key/value pairs: Built-in Data Types (Developing Perl)
  • • Hashes (Developing Perl)
    • capturing from string with m//g operator: (Developing Perl) 5.2.2. The m// Operator (Matching)
    • Hashes. (Developing Perl)
  • multidimensional: Hashes of Hashes (Developing Perl)
  • • accessing and printing: Access and Printing of a Hash of Hashes (Developing Perl)
    • generation of: Generation of a Hash of Hashes (Developing Perl)
  • names for: Variables (Developing Perl)
  • of arrays: Hashes of Arrays (Developing Perl)
  • • Arrays of Hashes (Developing Perl)
    • access and printing of: Access and Printing of a Hash of Arrays (Developing Perl)
    • generating: Generation of a Hash of Arrays (Developing Perl)
    • • Generation of an Array of Hashes (Developing Perl)
  • of complex records: Generation of a Hash of Complex Records (Developing Perl)
  • output style, changing in debugger: Debugger Options (Developing Perl)
  • passing by reference into or out of functions: Passing References (Developing Perl)
  • Perl data organization in: Common Mistakes (Developing Perl)
  • processing, functions for: Perl Functions by Category (Developing Perl)
  • references as keys: References Don't Work as Hash Keys (Developing Perl)
  • references to: What Is a Reference? (Developing Perl)
  • restricted, implementing: Using Closures for Private Objects (Developing Perl)
  • returning key/value pairs: each (Developing Perl)
  • returning values of: values (Developing Perl)
  • %SIG, references to signal handlers: Signals (Developing Perl)
  • symbol tables: Symbol Tables (Developing Perl)
  • • key/value pairs in: Symbol Tables (Developing Perl)
    • typeglobs in: Symbol Tables (Developing Perl)
  • taint in: Handling Insecure Data (Developing Perl)
  • tying: Tied Variables (Developing Perl)
  • • Tying Hashes (Developing Perl)
    • methods for: Hash-Tying Methods (Developing Perl)
    • Tie::Hash module, providing base class definitions: Convenient Classes (Developing Perl)
• hashes (associative arrays): View of the Internals (Advanced Perl Developing)
• • Extracting Unique Elements from a List (Perl tutorial)
  • Introduction (Perl tutorial)
  • Data Types and Variables (Perl tutorial)
  • Hashes (Perl tutorial)
  • adding elements to: Adding an Element to a Hash (Perl tutorial)
  • • Prototyping Functions (Perl tutorial)
  • anonymous: References to Anonymous Storage (Advanced Perl Developing)
  • • Final Shortcut: Omit Arrows Between Subscripts (Advanced Perl Developing)
    • Introduction (Perl tutorial)
  • arrow notation for: Shortcuts with the Arrow Notation (Advanced Perl Developing)
  • binding: Tying Hashes (Advanced Perl Developing)
  • comparing for keys: Finding Common or Different Keys in Two Hashes (Perl tutorial)
  • dutree program: Program: dutree (Perl tutorial)
  • examples: Representation (Advanced Perl Developing)
  • finding most common anything: Finding the Most Common Anything (Perl tutorial)
  • for list unions, intersections, differences: Finding Elements in One Array but Not Another (Perl tutorial)
  • functions for processing: Perl Functions by Category (Perl tutorial)
  • inverting: Inverting a Hash (Perl tutorial)
  • merging: Merging Hashes (Perl tutorial)
  • multiple values per key: Hashes with Multiple Values Per Key (Perl tutorial)
  • named: Nested Data Structures (Advanced Perl Developing)
  • of arrays: Making Hashes of Arrays (Perl tutorial)
  • of hashes: Hash of Hashes Representation (Advanced Perl Developing)
  • of symbolic references: Symbolic References (Advanced Perl Developing)
  • passing to subroutines: Passing Arrays and Hashes to Subroutines (Advanced Perl Developing)
  • presizing: Presizing a Hash (Perl tutorial)
  • printing: Printing a Hash (Perl tutorial)
  • reading/writing records to file: Reading and Writing Hash Records to Text Files (Perl tutorial)
  • references as elements: Hashing References (Perl tutorial)
  • references to: References to Hashes (Advanced Perl Developing)
  • • Array/Hash References Versus Element References (Advanced Perl Developing)
    • Taking References to Hashes (Perl tutorial)
  • removing/deleting elements from: Deleting from a Hash (Perl tutorial)
  • representing data relationships: Representing Relationships Between Data (Perl tutorial)
  • retrieving in insertion order: Retrieving from a Hash in Insertion Order (Perl tutorial)
  • returning keys and values: Testing for the Presence of a Key in a Hash (Perl tutorial)
  • simulating data structures with: User-Defined Structures (Advanced Perl Developing)
  • slices of: Finding Elements in One Array but Not Another (Perl tutorial)
  • sorting elements of: Sorting a Hash (Perl tutorial)
  • special (predefined): Global Special Arrays and Hashes (Perl tutorial)
  • tied: Creating Magic Variables with tie (Perl tutorial)
  • traversing: Traversing a Hash (Perl tutorial)
• head()
• • LWP::Simple module: Finding Stale Links (Perl tutorial)
  • • Reference: head (Perl tutorial)
    • LWP::Simple (Perl tutorial)
  • Mail::Internet module: Reference: head (Perl tutorial)
  • • Reference: Head (Perl tutorial)
    • Counting messages (Perl tutorial)
  • Net::NNTP module: Reference: head (Perl tutorial)
• =head2 command (pod): Reference: =head2 (Perl tutorial)
• =head2 pod directive: Documenting Your Module with Pod (Perl tutorial)
• HEAD method: Introduction (Perl tutorial)
• HeadAndBody() (Mail::POP3Client): Reference: HeadAndBody (Perl tutorial)
• • Retrieving the message body (Perl tutorial)
• header()
• • CGI.pm module: Reference: header (Perl tutorial)
  • • The CGI.pm Module (Perl tutorial)
  • HTTP::Headers module: Reference: header (Perl tutorial)
  • HTTP::Message module: Reference: headers (Perl tutorial)
• • (see also modules)
• header files (C): The Extension Process (Advanced Perl Developing)
• headerfy program (example): Matching Multiple Lines (Perl tutorial)
• headers, format names: Footers (Developing Perl)
• headers, HTTP: HTTP::Headers (Perl tutorial)
• -height option
• • place geometry manager: The Place Geometry Manager (Perl tutorial)
  • widgets: Common Widget Configuration Options (Perl tutorial)
• hello() (Net::SMTP): Reference: hello (Perl tutorial)
• Hello, world (program example)
• HELO command (SMTP): The SMTP Protocol and the SMTP Session (Perl tutorial)
• help
• • Perl references: More information (Perl tutorial)
  • pod documentation for modules: Documenting Your Module with Pod (Perl tutorial)
  • • sorting =head1 sections: Program: tkshufflepod (Perl tutorial)
  • web references: Introduction (Perl tutorial)
• help desk, using email for: Support Mail Augmentation (Perl for System Administration)
• help() (Net::SMTP): Reference: help (Perl tutorial)
• here documents: Template Parser (Advanced Perl Developing)
• • Introduction (Perl tutorial)
  • "Here" Documents (Developing Perl)
  • indentation of: "Here" Documents (Developing Perl)
  • indenting: Indenting Here Documents (Perl tutorial)
  • semicolon (;), omitting trailing: Universal Blunders (Developing Perl)
• HEs (hash entries): Hash Values (HVs) (Advanced Perl Developing)
• hex(): Converting Between Octal and Hexadecimal (Perl tutorial)
• • Reference: hex (Perl tutorial)
• hex function: hex (Developing Perl)
• • converting numbers to: (Developing Perl) 5.2.3. The s/// Operator (Substitution)
• hexadecimal characters: Numeric Literals (Developing Perl)
• hexadecimal numbers: Converting Between Octal and Hexadecimal (Perl tutorial)
• • hex (Developing Perl)
  • character numbers, specifying as: Specific Characters (Developing Perl)
• HFS (Hierarchical File System): MacOS (Perl for System Administration)
• hidden() (CGI.pm): Writing a Multiscreen CGI Script (Perl tutorial)
• • Reference: hidden (Perl tutorial)
• Hietaniemi, Jarkko: The CPAN Architecture (Perl tutorial)
• high-resolution timers: High-Resolution Timers (Perl tutorial)
• higher-order procedures: Expression plotting (Advanced Perl Developing)
• -highlightbackground option (widgets): Common Widget Configuration Options (Perl tutorial)
• hints, compiler: Special Variables in Alphabetical Order (Developing Perl)
• HiRes module: Example: Stopwatch (Advanced Perl Developing)
• history, command: Using the Debugger (Developing Perl)
• history object (PerlScript): Client-Side PerlScript (Perl tutorial)
• history of Perl: History Made Practical (Developing Perl)
• history.db file, grepping: Program: ggh&nbsp- Grep Netscape Global History (Perl tutorial)
• hiweb program (example): Writing a CGI Script (Perl tutorial)
• HList widgets: HList&nbsp- Hierarchical List (Advanced Perl Developing)
• • HList (Advanced Perl Developing)
• home directory: chdir (Developing Perl)
• home directory field (Unix): The Classic Unix Password File (Perl for System Administration)
• home page, Perl: Perl on the Web (Developing Perl)
• HOME variable: Environment Variables (Perl tutorial)
• • Environment Variables (Developing Perl)
• hopdelta program: Program: hopdelta (Perl tutorial)
• host()
• • Mail::Address module: Reference: host (Perl tutorial)
  • • Parse Email Addresses with Mail::Address (Perl tutorial)
  • URI::URL module: Reference: host (Perl tutorial)
• host files
• • generating from a database
  • • error checking while: Error Checking the Host File Generation Process (Perl for System Administration)
    • improving output while: Improving the Host File Output (Perl for System Administration)
  • generating, modules for: Putting It All Together (Perl for System Administration)
  • Macintosh HD\:System Folder\:Preferences\:hosts: Host Files (Perl for System Administration)
  • parsing: Host Files (Perl for System Administration)
  • reading from Perl: Host Files (Perl for System Administration)
  • source control systems and: Incorporating a Source Code Control System (Perl for System Administration)
  • \\\\$systemroot$\\\\system32\\\\drivers\\\\etc\\\\hosts file: Host Files (Perl for System Administration)
  • Unix: Host Files (Perl for System Administration)
  • • Host Files (Perl for System Administration)
  • Windows: Windows Internet Name Server ( WINS) (Perl for System Administration)
• h2xs program: Preventing Suspicious Activities (Perl for System Administration)
• Host() (Mail::POP3Client): Reference: Host (Perl tutorial)
• • Getting and setting the host and port (Perl tutorial)
• hostnames
• • getting from network addresses: gethostbyaddr (Developing Perl)
  • Sys::Hostname module: Operating System Interfaces (Developing Perl)
  • translating to addresses: gethostbyname (Developing Perl)
  • • getnetbyname (Developing Perl)
• hostpath (IO::Socket::UNIX): Reference: hostpath (Perl tutorial)
• hosts file (see /etc/hosts file)
• hosts (remote), checking for reachability: Networking and Interprocess Communication (Developing Perl)
• host_wait() (LWP::RobotUA): Reference: host_wait (Perl tutorial)
• hostname, obtaining your own: Finding Your Own Name and Address (Perl tutorial)
• HotKey module: Using POSIX termios (Perl tutorial)
• household appliances, Perl modules for: The CPAN modules Directory (Developing Perl)
• h2ph tool: Using h2ph to Translate C #include Files (Perl tutorial)
• HREF fields, substitutions for: Program: hrefsub (Perl tutorial)
• hrefsub program (example): Program: hrefsub (Perl tutorial)
• HTML
• • CGI module, generation of: World Wide Web (Developing Perl)
  • code, producing nicely formatted: World Wide Web (Developing Perl)
  • Perl modules for: The CPAN modules Directory (Developing Perl)
  • pod files, converting to: Documentation Support (Developing Perl)
• HTML (Hypertext Markup Language)
• • converting ASCII to/from: Converting ASCII to HTML (Perl tutorial)
  • extracting tags: Extracting or Removing HTML Tags (Perl tutorial)
  • extracting URLs from: Extracting URLs (Perl tutorial)
  • finding stale/fresh links: Finding Stale Links (Perl tutorial)
  • formatting, shortcuts in CGI.pm: Formatting Lists and Tables with HTML Shortcuts (Perl tutorial)
  • forms: Introduction (Perl tutorial)
  • • automating submission: Automating Form Submission (Perl tutorial)
    • saving/mailing: Saving a Form to a File or Mail Pipe (Perl tutorial)
    • sticky widgets: Creating Sticky Widgets (Perl tutorial)
  • putting links around URLs: Program: urlify (Perl tutorial)
  • tags, generating with CGI.pm: HTML Tag Generation (Perl tutorial)
  • templates: Creating HTML Templates (Perl tutorial)
  • text substitutions: Program: htmlsub (Perl tutorial)
  • translating pod to: Reference: pod2html (Perl tutorial)
  • • Pod::Html (Perl tutorial)
• :html method groups: Importing Method Groups (Perl tutorial)
• HTML modules: The HTML Module (Perl tutorial)
• • HTML::Element: HTML::Element (Perl tutorial)
  • HTML::Entities module: Converting ASCII to HTML (Perl tutorial)
  • HTML::FormatPS: HTML::FormatPS (Perl tutorial)
  • HTML::FormatText: Converting HTML to ASCII (Perl tutorial)
  • • HTML::FormatText (Perl tutorial)
  • HTML::LinkExtor module: Extracting URLs (Perl tutorial)
  • HTML::Parser: The HTML Module (Perl tutorial)
  • • HTML::Parser (Perl tutorial)
  • HTML::TreeBuilder: Converting HTML to ASCII (Perl tutorial)
  • • HTML::TreeBuilder (Perl tutorial)
• htmlsub program (example): Program: htmlsub (Perl tutorial)
• HTTP
• • cookies, setting and getting: World Wide Web (Developing Perl)
  • • links, searching for: Regular Expressions (Developing Perl)
    • • The CPAN modules Directory (Developing Perl)
• HTTP (Hypertext Transfer Protocol)
• • debugging exchanges in: Debugging the Raw HTTP Exchange (Perl tutorial)
  • methods: Introduction (Perl tutorial)
  • • Writing a CGI Script (Perl tutorial)
  • request messages: LWP Overview (Perl tutorial)
  • Win32::Internet functions for: HTTP Functions (Perl tutorial)
• HTTP() (Win32::Internet): Reference: HTTP (Perl tutorial)
• HTTP modules
• • HTTP::Cookies module: HTTP::Cookies (Perl tutorial)
  • HTTP::Cookies::Netscape module: HTTP::Cookies::Netscape (Perl tutorial)
  • HTTP::Daemon module: HTTP::Daemon (Perl tutorial)
  • HTTP::Daemon::ClientConn module: HTTP::Daemon::ClientConn methods (Perl tutorial)
  • HTTP::Date module: HTTP::Date (Perl tutorial)
  • HTTP::Headers module: HTTP::Headers (Perl tutorial)
  • HTTP::Message module: HTTP::Message (Perl tutorial)
  • HTTP::Request module: LWP Overview (Perl tutorial)
  • • HTTP::Request (Perl tutorial)
  • HTTP::Response module: LWP Overview (Perl tutorial)
  • • HTTP::Response (Perl tutorial)
  • HTTP::Status module: HTTP::Status (Perl tutorial)
• HTTP_ACCEPT variable: CGI Environment Variables (Perl tutorial)
• HTTP_COOKIE variable: CGI Environment Variables (Perl tutorial)
• HTTP_FROM variable: CGI Environment Variables (Perl tutorial)
• HTTP_REFERER variable: CGI Environment Variables (Perl tutorial)
• HTTP_USER_AGENT variable: CGI Environment Variables (Perl tutorial)
• Hubbard, John: Detour into Fractals (Advanced Perl Developing)
• Hungarian notation: Dereferencing Multiple Levels of Indirection (Advanced Perl Developing)
• HV (internal hash value): Internal Data Types (Developing Perl)
• • Hash Values (HVs) (Advanced Perl Developing)
  • links, searching for: Internal Data Types (Developing Perl)
• h2xs: Preparing a Module for Distribution (Perl tutorial)
• • Using h2xs to Make a Module with C Code (Perl tutorial)
  • XS and XSUBs (Developing Perl)
  • Creating Extensions (Developing Perl)
  • Creating CPAN Modules (Developing Perl)
• hyperlinks: Introduction (Perl tutorial)
• • Finding Stale Links (Perl tutorial)
• hyphenating text, Perl module for: The CPAN modules Directory (Developing Perl)

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