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Index: H

• command (CPAN.pm) : Perl tutorial, Chapter 2, Reference: h
• command (debugger)
• • Perl tutorial, Chapter 6, Reference: h
  • Perl Developing, 8.1.1. Debugger Commands
• command (debugger)
• • Perl tutorial, Chapter 6, Reference: H
  • Perl Developing, 8.1.1. Debugger Commands
• -h option (perl)
• • Perl tutorial, 3.2. Command-Line Options
  • Perl Developing, 6.1.2. Switches
• -h option (perlbug) : Perl tutorial, 6.6. The perlbug Program
• ph tool : Perl tutorial, 12.14. Using h2ph to Translate C #include Files
• xs tool
• • (see XS tool)
  • Perl tutorial, 12.8. Preparing a Module for Distribution
  • Perl tutorial, 12.15. Using h2xs to Make a Module with C Code
• handles
• • (see directory handles)
  • (see filehandles)
• handling
• • exceptions : (see exceptions)
  • multiple clients : Advanced Perl Developing, 12.3. Handling Multiple Clients
  • signals : Advanced Perl Developing, 4.2.2. Signal Handlers
• handling signals : (see signals)
• hard links
• • Perl tutorial, 9.0. Introduction
  • Learning Perl, 13.3. Creating Alternate Names for a File: Linking
• hard references
• • Advanced Perl Developing, 1.6.1. Reference Counts
  • Perl Developing, 4.1. What Is a Reference?
  • Perl Developing, 4.2. Creating Hard References
  • Perl Developing, 4.5.1. Hard References Don't Work as Hash Keys
• Harness module : Perl Developing, 7.2.66. Test::Harness - Run Perl Standard Test Scripts with Statistics
• "has-a" relationship : Perl Developing, 5.5.5. Containment (the "Has-a" Relationship)
• hash functions : Advanced Perl Developing, 20.3.3.1. Inside HVs
• hash keys : Learning Perl on Win32 Systems, 1.6.6. Giving Each Person a Different Secret Word
• hash mark : (see # (hash mark))
• Hash module : Perl Developing, 7.2.72. Tie::Hash, Tie::StdHash - Base Class Definitions for Tied Hashes
• hash operators : Learning Perl on Win32 Systems, 5.4. Hash Functions
• hash prototype symbol (%) : Perl tutorial, 4.7.5. Prototypes
• hash values/entries (HVs/HEs) : Advanced Perl Developing, 20.3.3. Hash Values (HVs)
• • stashes : (see symbol tables)
• hashes (associative arrays)
• • Advanced Perl Developing, 1.6. A View of the Internals
  • Perl tutorial, 4.6. Extracting Unique Elements from a List
  • Perl tutorial, 5.0. Introduction
  • Learning Perl, 1.5.6. Giving Each Person a Different Secret Word
  • Learning Perl, 5.1. What Is a Hash?
  • Learning Perl on Win32 Systems, 1.6.6. Giving Each Person a Different Secret Word
  • Learning Perl on Win32 Systems, 5.1. What Is a Hash?
  • Perl tutorial, 4.2. Data Types and Variables
  • Perl tutorial, 4.2.4.2. Hashes
  • Perl Developing, 1.2.1.2. Pluralities
  • Perl Developing, 2.2. Built-in Data Types
  • Perl Developing, 2.3.5. Hashes (Associative Arrays)
  • adding elements to
  • • Perl tutorial, 5.1. Adding an Element to a Hash
    • Perl tutorial, 10.11. Prototyping Functions
  • anonymous
  • • Advanced Perl Developing, 1.2.3. References to Anonymous Storage
    • Advanced Perl Developing, 1.3.2. Final Shortcut: Omit Arrows Between Subscripts
    • Perl tutorial, 11.0. Introduction
    • Perl Developing, 4.2.3. The Anonymous Hash Composer
  • of arrays
  • • Perl tutorial, 11.2. Making Hashes of Arrays
    • Perl Developing, 4.7.2. Hashes of Arrays
  • arrow notation for : Advanced Perl Developing, 1.1.7. Shortcuts with the Arrow Notation
  • binding
  • • Advanced Perl Developing, 9.3. Tying Hashes
    • Perl Developing, 3.2.24. dbmopen
  • comparing for keys : Perl tutorial, 5.11. Finding Common or Different Keys in Two Hashes
  • of complex records : Perl Developing, 4.7.5.3. Generation of a hash of complex records
  • creating new elements : Learning Perl, 5.2. Hash Variables
  • dictionary file, searching : Perl Developing, 7.2.53. Search::Dict - Search for Key in Dictionary File
  • dutree program : Perl tutorial, 5.16. Program: dutree
  • examples
  • • Advanced Perl Developing, 2.3.1. Representation
    • Learning Perl, 1.5.6. Giving Each Person a Different Secret Word
    • Learning Perl on Win32 Systems, 1.6.6. Giving Each Person a Different Secret Word
  • finding most common anything : Perl tutorial, 5.14. Finding the Most Common Anything
  • functions for processing : Perl tutorial, 5.1. Perl Functions by Category
  • global : Perl Developing, 2.9.4. Global Special Arrays
  • hard references as keys : Perl Developing, 4.5.1. Hard References Don't Work as Hash Keys
  • of hashes : Advanced Perl Developing, 2.2.1. Hash of Hashes Representation
  • initializing with x operator : Perl Developing, 2.5.7. Multiplicative Operators
  • instead of linear searches : Perl Developing, 8.3.1. Time Efficiency
  • inverting
  • • Perl tutorial, 5.8. Inverting a Hash
    • Perl Developing, 3.2.126. reverse
  • key/value pair precedence : Perl Developing, 2.3.5. Hashes (Associative Arrays)
  • for list unions, intersections, differences : Perl tutorial, 4.7. Finding Elements in One Array but Not Another
  • literal representation of : Learning Perl, 5.3. Literal Representation of a Hash
  • merging : Perl tutorial, 5.10. Merging Hashes
  • multidimensional : Perl Developing, 4.7.4. Hashes of Hashes
  • multiple values per key : Perl tutorial, 5.7. Hashes with Multiple Values Per Key
  • named
  • • Advanced Perl Developing, 1.3. Nested Data Structures
    • Perl Developing, 2.3.1. Variables
  • order in
  • • Learning Perl, 5.1. What Is a Hash?
    • Learning Perl on Win32 Systems, 5.1. What Is a Hash?
  • passing to subroutines : Advanced Perl Developing, 1.2.1. Passing Arrays and Hashes to Subroutines
  • presizing : Perl tutorial, 5.13. Presizing a Hash
  • printing : Perl tutorial, 5.5. Printing a Hash
  • reading/writing records to file : Perl tutorial, 11.10. Reading and Writing Hash Records to Text Files
  • references as elements : Perl tutorial, 5.12. Hashing References
  • references to
  • • Advanced Perl Developing, 1.1.5. References to Hashes
    • Advanced Perl Developing, 1.6.2. Array/Hash References Versus Element References
    • Perl tutorial, 11.3. Taking References to Hashes
  • removing/deleting elements from
  • • Perl tutorial, 5.3. Deleting from a Hash
    • Learning Perl, 5.4.4. The delete Function
    • Perl Developing, 3.2.26. delete
  • representing data relationships : Perl tutorial, 5.15. Representing Relationships Between Data
  • retrieving in insertion order : Perl tutorial, 5.6. Retrieving from a Hash in Insertion Order
  • returning keys and values
  • • Perl tutorial, 5.2. Testing for the Presence of a Key in a Hash
    • Perl Developing, 3.2.30. each
    • Perl Developing, 3.2.79. keys
    • Perl Developing, 3.2.187. values
  • simulating data structures with : Advanced Perl Developing, 2.1. User-Defined Structures
  • slices of : Perl tutorial, 4.7. Finding Elements in One Array but Not Another
  • sorting elements of
  • • Perl tutorial, 5.9. Sorting a Hash
    • Learning Perl, 15.4. Advanced Sorting
    • Perl Developing, 7.2.8.4. In-memory databases
  • special (predefined) : Perl tutorial, 4.4.2. Global Special Arrays and Hashes
  • stepping through : Learning Perl, 5.4.3. The each Function
  • SubstrHash module : Perl Developing, 7.2.74. Tie::SubstrHash - Fixed-table-size, Fixed-key-length Hashing
  • symbol tables : Perl Developing, 5.1.1. Symbol Tables
  • of symbolic references : Advanced Perl Developing, 1.5. Symbolic References
  • tied
  • • Perl tutorial, 13.15. Creating Magic Variables with tie
    • Perl Developing, 7.2.72. Tie::Hash, Tie::StdHash - Base Class Definitions for Tied Hashes
  • traversing : Perl tutorial, 5.4. Traversing a Hash
  • typing : Perl Developing, 5.4.3. Tying Hashes
  • variables : Learning Perl, 5.2. Hash Variables
• head()
• • LWP::Simple module
  • • Perl tutorial, 20.7. Finding Stale Links
    • Perl tutorial, Chapter 17, Reference: head
    • Perl tutorial, 17.2.2. LWP::Simple
  • Mail::Internet module
  • • Perl tutorial, Chapter 14, Reference: head
    • Perl tutorial, Chapter 14, Reference: Head
    • Perl tutorial, 14.2.8.1. Counting messages
  • Net::NNTP module : Perl tutorial, Chapter 15, Reference: head
• HEAD method : Perl tutorial, 19.0. Introduction
• =head1 command (pod) : Perl tutorial, Chapter 4, Reference: =head1
• =head2 command (pod) : Perl tutorial, Chapter 4, Reference: =head2
• =head2 pod directive : Perl tutorial, 12.16. Documenting Your Module with Pod
• HeadAndBody() (Mail::POP3Client)
• • Perl tutorial, Chapter 14, Reference: HeadAndBody
  • Perl tutorial, 14.2.8.3. Retrieving the message body
• header()
• • CGI.pm module
  • • Perl tutorial, Chapter 10, Reference: header
    • Perl tutorial, 10. The CGI.pm Module
  • HTTP::Headers module : Perl tutorial, Chapter 17, Reference: header
  • HTTP::Message module : Perl tutorial, Chapter 17, Reference: headers
• header files (C) : Advanced Perl Developing, 18.1.1. The Extension Process
• headerfy program (example) : Perl tutorial, 6.6. Matching Multiple Lines
• headers, HTTP : Perl tutorial, 17.3.3. HTTP::Headers
• -height option
• • place geometry manager : Perl tutorial, 18.2.3. The Place Geometry Manager
  • widgets : Perl tutorial, 18.3. Common Widget Configuration Options
• hello() (Net::SMTP) : Perl tutorial, Chapter 14, Reference: hello
• Hello, world (program example)
• • Learning Perl, 1.5.1. The "Hello, World" Program
  • Learning Perl on Win32 Systems, 1.6.1. The "Hello, world" Program
• HELO command (SMTP) : Perl tutorial, 14.1.2. The SMTP Protocol and the SMTP Session
• help
• • documentation : Learning Perl on Win32 Systems, 1.5.1. Documentation
  • Perl references : Perl tutorial, Other Books
  • pod documentation for modules : Perl tutorial, 12.16. Documenting Your Module with Pod
  • • sorting =head1 sections : Perl tutorial, 15.19. Program: tkshufflepod
  • technical support : Learning Perl on Win32 Systems, 1.4. Support
  • web references : Perl tutorial, 19.0. Introduction
• help() (Net::SMTP) : Perl tutorial, Chapter 14, Reference: help
• here documents
• • Advanced Perl Developing, 17.4.2. Template Parser
  • Perl tutorial, 1.0. Introduction
  • Learning Perl, 19.3. Simplest CGI Program
  • Perl Developing, 2.3.2.6. "Here" documents
  • indenting : Perl tutorial, 1.11. Indenting Here Documents
• here strings : Learning Perl, 2.3. Strings
• HEs (hash entries) : Advanced Perl Developing, 20.3.3. Hash Values (HVs)
• hex()
• • Perl tutorial, 2.16. Converting Between Octal and Hexadecimal
  • Learning Perl, 2.2.3. Integer Literals
  • Learning Perl, 2.4.4. Conversion Between Numbers and Strings
  • Learning Perl on Win32 Systems, 2.2.3. Integer Literals
  • Learning Perl on Win32 Systems, 2.4.4. Conversion Between Numbers and Strings
  • Perl tutorial, Chapter 5, Reference: hex
  • Perl Developing, 3.2.73. hex
• hexadecimal numbers
• • Perl tutorial, 2.16. Converting Between Octal and Hexadecimal
  • Learning Perl, 2.2.3. Integer Literals
  • Perl Developing, 2.3.2.2. String literals
  • Perl Developing, 2.4.1.2. The rules of regular expression matching
  • Perl Developing, 3.2.73. hex
• hidden() (CGI.pm)
• • Perl tutorial, 19.12. Writing a Multiscreen CGI Script
  • Perl tutorial, Chapter 10, Reference: hidden
• Hietaniemi, Jarkko : Perl tutorial, 2.1. The CPAN Architecture
• high-resolution timers : Perl tutorial, 3.9. High-Resolution Timers
• higher-order procedures : Advanced Perl Developing, 4.2.2.1. Expression plotting
• -highlightbackground option (widgets) : Perl tutorial, 18.3. Common Widget Configuration Options
• -highlightcolor option (widgets) : Perl tutorial, 18.3. Common Widget Configuration Options
• -highlightthickness option (widgets) : Perl tutorial, 18.3. Common Widget Configuration Options
• hints, compiler : Perl Developing, 2.9.3. Global Special Variables
• HiRes module : Advanced Perl Developing, 9.1.1. Example: Stopwatch
• history object (PerlScript) : Perl tutorial, 20.1. Client-Side PerlScript
• history of Perl
• • Learning Perl, 1.1. History of Perl
  • Perl Developing, 8.7. History Made Practical
• history, command : Perl Developing, 8.1.2. Using the Debugger
• history.db file, grepping : Perl tutorial, 14.11. Program: ggh&nbsp- Grep Netscape Global History
• hives, Registry : Learning Perl on Win32 Systems, 16.4.1. The Registry Structure
• hiweb program (example) : Perl tutorial, 19.1. Writing a CGI Script
• HKEY_LOCAL_MACHINE subtree : Learning Perl on Win32 Systems, 16.4.1. The Registry Structure
• HList widgets
• • Advanced Perl Developing, A.8. HList&nbsp- Hierarchical List
  • Advanced Perl Developing, 14.3.11. HList
• home directory : Perl Developing, 3.2.11. chdir
• • example of listing : Learning Perl, 16.1. Getting Password and Group Information
  • in password file : Learning Perl, 16.1. Getting Password and Group Information
• HOME variable : Perl tutorial, 3.3. Environment Variables
• homepage, Perl : Perl Developing, The Perl Homepage
• hopdelta program : Perl tutorial, 3.11. Program: hopdelta
• host()
• • Mail::Address module
  • • Perl tutorial, Chapter 14, Reference: host
    • Perl tutorial, 14.2.6. Parse Email Addresses with Mail::Address
  • URI::URL module : Perl tutorial, Chapter 17, Reference: host
• Host() (Mail::POP3Client)
• • Perl tutorial, Chapter 14, Reference: Host
  • Perl tutorial, 14.2.8.2. Getting and setting the host and port
• host_wait() (LWP::RobotUA) : Perl tutorial, Chapter 17, Reference: host_wait
• hostname, obtaining your own : Perl tutorial, 17.8. Finding Your Own Name and Address
• hostnames
• • Perl Developing, 3.2.47. gethostbyaddr
  • Perl Developing, 3.2.48. gethostbyname
  • Perl Developing, 3.2.52. getnetbyname
  • Perl Developing, 7.2.62. Sys::Hostname - Try Every Conceivable Way to Get Hostname
• hostpath (IO::Socket::UNIX) : Perl tutorial, Chapter 13, Reference: hostpath
• hosts file : Perl Developing, 3.2.49. gethostent
• hosts, pinging : Perl Developing, 7.2.46. Net::Ping - Check Whether a Host Is Online
• HotKey module : Perl tutorial, 15.8. Using POSIX termios
• hours : (see date and time)
• HREF fields, substitutions for : Perl tutorial, 20.15. Program: hrefsub
• hrefsub program (example) : Perl tutorial, 20.15. Program: hrefsub
• HTML (Hypertext Markup Language)
• • converting ASCII to/from : Perl tutorial, 20.4. Converting ASCII to HTML
  • extracting tags : Perl tutorial, 20.6. Extracting or Removing HTML Tags
  • extracting URLs from : Perl tutorial, 20.3. Extracting URLs
  • finding stale/fresh links : Perl tutorial, 20.7. Finding Stale Links
  • formatting, shortcuts in CGI.pm : Perl tutorial, 19.7. Formatting Lists and Tables with HTML Shortcuts
  • forms
  • • Perl tutorial, 19.0. Introduction
    • Learning Perl, 19.2. Your CGI Program in Context
    • Learning Perl, 19.6. Form Generation
    • automating submission : Perl tutorial, 20.2. Automating Form Submission
    • elements of : Learning Perl, 19.7. Other Form Elements
    • saving/mailing : Perl tutorial, 19.13. Saving a Form to a File or Mail Pipe
    • sticky widgets : Perl tutorial, 19.11. Creating Sticky Widgets
  • putting links around URLs : Perl tutorial, 6.21. Program: urlify
  • tags, generating with CGI.pm : Perl tutorial, 10.1. HTML Tag Generation
  • templates : Perl tutorial, 20.9. Creating HTML Templates
  • text substitutions : Perl tutorial, 20.14. Program: htmlsub
  • translating pod to
  • • Perl tutorial, Chapter 4, Reference: pod2html
    • Perl tutorial, 8.121. Pod::Html
• :html method groups : Perl tutorial, 10.2. Importing Method Groups
• HTML modules : Perl tutorial, 17.4. The HTML Module
• • HTML::Element : Perl tutorial, 17.4.2. HTML::Element
  • HTML::Entities module : Perl tutorial, 20.4. Converting ASCII to HTML
  • HTML::FormatPS : Perl tutorial, 17.4.4. HTML::FormatPS
  • HTML::FormatText
  • • Perl tutorial, 20.5. Converting HTML to ASCII
    • Perl tutorial, 17.4.5. HTML::FormatText
  • HTML::LinkExtor module : Perl tutorial, 20.3. Extracting URLs
  • HTML::Parser
  • • Perl tutorial, 17.4. The HTML Module
    • Perl tutorial, 17.4.1. HTML::Parser
  • HTML::TreeBuilder
  • • Perl tutorial, 20.5. Converting HTML to ASCII
    • Perl tutorial, 17.4.3. HTML::TreeBuilder
• :html2 and :html3 import tags : Learning Perl, 19.5. Less Typing
• htmlsub program (example) : Perl tutorial, 20.14. Program: htmlsub
• HTTP (Hypertext Transfer Protocol)
• • debugging exchanges in : Perl tutorial, 19.9. Debugging the Raw HTTP Exchange
  • methods
  • • Perl tutorial, 19.0. Introduction
    • Perl tutorial, 19.1. Writing a CGI Script
  • request messages : Perl tutorial, 17.1. LWP Overview
  • Win32::Internet functions for : Perl tutorial, 19.7.3. HTTP Functions
• HTTP() (Win32::Internet) : Perl tutorial, Chapter 19, Reference: HTTP
• HTTP modules
• • HTTP::Cookies module : Perl tutorial, 17.3.6. HTTP::Cookies
  • HTTP::Cookies::Netscape module : Perl tutorial, 17.3.6.1. HTTP::Cookies::Netscape
  • HTTP::Daemon module : Perl tutorial, 17.3.7. HTTP::Daemon
  • HTTP::Daemon::ClientConn module : Perl tutorial, 17.3.7.1. HTTP::Daemon::ClientConn methods
  • HTTP::Date module : Perl tutorial, 17.3.5. HTTP::Date
  • HTTP::Headers module : Perl tutorial, 17.3.3. HTTP::Headers
  • HTTP::Message module : Perl tutorial, 17.3.8. HTTP::Message
  • HTTP::Request module
  • • Perl tutorial, 17.1. LWP Overview
    • Perl tutorial, 17.3.1. HTTP::Request
  • HTTP::Response module
  • • Perl tutorial, 17.1. LWP Overview
    • Perl tutorial, 17.3.2. HTTP::Response
  • HTTP::Status module : Perl tutorial, 17.3.4. HTTP::Status
• HTTP_ACCEPT variable : Perl tutorial, 9.4. CGI Environment Variables
• HTTP_COOKIE variable : Perl tutorial, 9.4. CGI Environment Variables
• HTTP_FROM variable : Perl tutorial, 9.4. CGI Environment Variables
• HTTP_REFERER variable : Perl tutorial, 9.4. CGI Environment Variables
• HTTP_USER_AGENT variable : Perl tutorial, 9.4. CGI Environment Variables
• Hubbard, John : Advanced Perl Developing, 18.6. A Detour into Fractals
• human-readable databases : Learning Perl, 17.5. Variable-Length (Text) Databases
• Hungarian notation : Advanced Perl Developing, 1.2.4. Dereferencing Multiple Levels of Indirection
• HVs (hash values) : Advanced Perl Developing, 20.3.3. Hash Values (HVs)
• hyperlinks
• • Perl tutorial, 9.0. Introduction
  • Perl tutorial, 20.7. Finding Stale Links
• hyphen : (see - (hyphen))

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