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Index: H

stashes : (see symbol tables)

hashes (associative arrays)

Advanced Perl Programming, 1.6. A View of the Internals

Perl Cookbook, 4.6. Extracting Unique Elements from a List

Perl Cookbook, 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 in a Nutshell, 4.2. Data Types and Variables

Perl in a Nutshell, 4.2.4.2. Hashes

Programming Perl, 1.2.1.2. Pluralities

Programming Perl, 2.2. Built-in Data Types

Programming Perl, 2.3.5. Hashes (Associative Arrays)

adding elements to

Perl Cookbook, 5.1. Adding an Element to a Hash
Perl Cookbook, 10.11. Prototyping Functions

anonymous

Advanced Perl Programming, 1.2.3. References to Anonymous Storage
Advanced Perl Programming, 1.3.2. Final Shortcut: Omit Arrows Between Subscripts
Perl Cookbook, 11.0. Introduction
Programming Perl, 4.2.3. The Anonymous Hash Composer

of arrays

Perl Cookbook, 11.2. Making Hashes of Arrays
Programming Perl, 4.7.2. Hashes of Arrays

arrow notation for : Advanced Perl Programming, 1.1.7. Shortcuts with the Arrow Notation

binding

Advanced Perl Programming, 9.3. Tying Hashes
Programming Perl, 3.2.24. dbmopen

comparing for keys : Perl Cookbook, 5.11. Finding Common or Different Keys in Two Hashes

of complex records : Programming Perl, 4.7.5.3. Generation of a hash of complex records

creating new elements : Learning Perl, 5.2. Hash Variables

dictionary file, searching : Programming Perl, 7.2.53. Search::Dict - Search for Key in Dictionary File

dutree program : Perl Cookbook, 5.16. Program: dutree

examples

Advanced Perl Programming, 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 Cookbook, 5.14. Finding the Most Common Anything

functions for processing : Perl in a Nutshell, 5.1. Perl Functions by Category

global : Programming Perl, 2.9.4. Global Special Arrays

hard references as keys : Programming Perl, 4.5.1. Hard References Don't Work as Hash Keys

of hashes : Advanced Perl Programming, 2.2.1. Hash of Hashes Representation

initializing with x operator : Programming Perl, 2.5.7. Multiplicative Operators

instead of linear searches : Programming Perl, 8.3.1. Time Efficiency

inverting

Perl Cookbook, 5.8. Inverting a Hash
Programming Perl, 3.2.126. reverse

key/value pair precedence : Programming Perl, 2.3.5. Hashes (Associative Arrays)

for list unions, intersections, differences : Perl Cookbook, 4.7. Finding Elements in One Array but Not Another

literal representation of : Learning Perl, 5.3. Literal Representation of a Hash

merging : Perl Cookbook, 5.10. Merging Hashes

multidimensional : Programming Perl, 4.7.4. Hashes of Hashes

multiple values per key : Perl Cookbook, 5.7. Hashes with Multiple Values Per Key

named

Advanced Perl Programming, 1.3. Nested Data Structures
Programming Perl, 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 Programming, 1.2.1. Passing Arrays and Hashes to Subroutines

presizing : Perl Cookbook, 5.13. Presizing a Hash

printing : Perl Cookbook, 5.5. Printing a Hash

reading/writing records to file : Perl Cookbook, 11.10. Reading and Writing Hash Records to Text Files

references as elements : Perl Cookbook, 5.12. Hashing References

references to

Advanced Perl Programming, 1.1.5. References to Hashes
Advanced Perl Programming, 1.6.2. Array/Hash References Versus Element References
Perl Cookbook, 11.3. Taking References to Hashes

removing/deleting elements from

Perl Cookbook, 5.3. Deleting from a Hash
Learning Perl, 5.4.4. The delete Function
Programming Perl, 3.2.26. delete

representing data relationships : Perl Cookbook, 5.15. Representing Relationships Between Data

retrieving in insertion order : Perl Cookbook, 5.6. Retrieving from a Hash in Insertion Order

returning keys and values

Perl Cookbook, 5.2. Testing for the Presence of a Key in a Hash
Programming Perl, 3.2.30. each
Programming Perl, 3.2.79. keys
Programming Perl, 3.2.187. values

simulating data structures with : Advanced Perl Programming, 2.1. User-Defined Structures

slices of : Perl Cookbook, 4.7. Finding Elements in One Array but Not Another

sorting elements of

Perl Cookbook, 5.9. Sorting a Hash
Learning Perl, 15.4. Advanced Sorting
Programming Perl, 7.2.8.4. In-memory databases

special (predefined) : Perl in a Nutshell, 4.4.2. Global Special Arrays and Hashes

stepping through : Learning Perl, 5.4.3. The each Function

SubstrHash module : Programming Perl, 7.2.74. Tie::SubstrHash - Fixed-table-size, Fixed-key-length Hashing

symbol tables : Programming Perl, 5.1.1. Symbol Tables

of symbolic references : Advanced Perl Programming, 1.5. Symbolic References

tied

Perl Cookbook, 13.15. Creating Magic Variables with tie
Programming Perl, 7.2.72. Tie::Hash, Tie::StdHash - Base Class Definitions for Tied Hashes

traversing : Perl Cookbook, 5.4. Traversing a Hash

typing : Programming Perl, 5.4.3. Tying Hashes

variables : Learning Perl, 5.2. Hash Variables

head()

LWP::Simple module

Perl Cookbook, 20.7. Finding Stale Links
Perl in a Nutshell, Chapter 17, Reference: head
Perl in a Nutshell, 17.2.2. LWP::Simple

Mail::Internet module

Perl in a Nutshell, Chapter 14, Reference: head
Perl in a Nutshell, Chapter 14, Reference: Head
Perl in a Nutshell, 14.2.8.1. Counting messages

Net::NNTP module : Perl in a Nutshell, Chapter 15, Reference: head

HEAD method : Perl Cookbook, 19.0. Introduction

=head1 command (pod) : Perl in a Nutshell, Chapter 4, Reference: =head1

=head2 command (pod) : Perl in a Nutshell, Chapter 4, Reference: =head2

=head2 pod directive : Perl Cookbook, 12.16. Documenting Your Module with Pod

HeadAndBody() (Mail::POP3Client)

Perl in a Nutshell, Chapter 14, Reference: HeadAndBody
Perl in a Nutshell, 14.2.8.3. Retrieving the message body

header()

CGI.pm module

Perl in a Nutshell, Chapter 10, Reference: header
Perl in a Nutshell, 10. The CGI.pm Module

HTTP::Headers module : Perl in a Nutshell, Chapter 17, Reference: header

HTTP::Message module : Perl in a Nutshell, Chapter 17, Reference: headers

header files (C) : Advanced Perl Programming, 18.1.1. The Extension Process

headerfy program (example) : Perl Cookbook, 6.6. Matching Multiple Lines

headers, HTTP : Perl in a Nutshell, 17.3.3. HTTP::Headers

-height option

place geometry manager : Perl in a Nutshell, 18.2.3. The Place Geometry Manager
widgets : Perl in a Nutshell, 18.3. Common Widget Configuration Options

hello() (Net::SMTP) : Perl in a Nutshell, 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 in a Nutshell, 14.1.2. The SMTP Protocol and the SMTP Session

help

documentation : Learning Perl on Win32 Systems, 1.5.1. Documentation

Perl references : Perl Cookbook, Other Books

pod documentation for modules : Perl Cookbook, 12.16. Documenting Your Module with Pod

sorting =head1 sections : Perl Cookbook, 15.19. Program: tkshufflepod

technical support : Learning Perl on Win32 Systems, 1.4. Support

web references : Perl Cookbook, 19.0. Introduction

help() (Net::SMTP) : Perl in a Nutshell, Chapter 14, Reference: help

here documents

Advanced Perl Programming, 17.4.2. Template Parser
Perl Cookbook, 1.0. Introduction
Learning Perl, 19.3. Simplest CGI Program
Programming Perl, 2.3.2.6. "Here" documents
indenting : Perl Cookbook, 1.11. Indenting Here Documents

here strings : Learning Perl, 2.3. Strings

HEs (hash entries) : Advanced Perl Programming, 20.3.3. Hash Values (HVs)

hex()

Perl Cookbook, 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 in a Nutshell, Chapter 5, Reference: hex
Programming Perl, 3.2.73. hex

hexadecimal numbers

Perl Cookbook, 2.16. Converting Between Octal and Hexadecimal
Learning Perl, 2.2.3. Integer Literals
Programming Perl, 2.3.2.2. String literals
Programming Perl, 2.4.1.2. The rules of regular expression matching
Programming Perl, 3.2.73. hex

hidden() (CGI.pm)

Perl Cookbook, 19.12. Writing a Multiscreen CGI Script
Perl in a Nutshell, Chapter 10, Reference: hidden

Hietaniemi, Jarkko : Perl in a Nutshell, 2.1. The CPAN Architecture

high-resolution timers : Perl Cookbook, 3.9. High-Resolution Timers

higher-order procedures : Advanced Perl Programming, 4.2.2.1. Expression plotting

-highlightbackground option (widgets) : Perl in a Nutshell, 18.3. Common Widget Configuration Options

-highlightcolor option (widgets) : Perl in a Nutshell, 18.3. Common Widget Configuration Options

-highlightthickness option (widgets) : Perl in a Nutshell, 18.3. Common Widget Configuration Options

hints, compiler : Programming Perl, 2.9.3. Global Special Variables

HiRes module : Advanced Perl Programming, 9.1.1. Example: Stopwatch

history object (PerlScript) : Perl in a Nutshell, 20.1. Client-Side PerlScript

history of Perl

Learning Perl, 1.1. History of Perl
Programming Perl, 8.7. History Made Practical

history, command : Programming Perl, 8.1.2. Using the Debugger

history.db file, grepping : Perl Cookbook, 14.11. Program: ggh - Grep Netscape Global History

hives, Registry : Learning Perl on Win32 Systems, 16.4.1. The Registry Structure

hiweb program (example) : Perl Cookbook, 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 Programming, A.8. HList - Hierarchical List
Advanced Perl Programming, 14.3.11. HList

home directory : Programming Perl, 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 in a Nutshell, 3.3. Environment Variables

homepage, Perl : Programming Perl, The Perl Homepage

hopdelta program : Perl Cookbook, 3.11. Program: hopdelta

host()

Mail::Address module

Perl in a Nutshell, Chapter 14, Reference: host
Perl in a Nutshell, 14.2.6. Parse Email Addresses with Mail::Address

URI::URL module : Perl in a Nutshell, Chapter 17, Reference: host

Host() (Mail::POP3Client)

Perl in a Nutshell, Chapter 14, Reference: Host
Perl in a Nutshell, 14.2.8.2. Getting and setting the host and port

host_wait() (LWP::RobotUA) : Perl in a Nutshell, Chapter 17, Reference: host_wait

hostname, obtaining your own : Perl Cookbook, 17.8. Finding Your Own Name and Address

hostnames

Programming Perl, 3.2.47. gethostbyaddr
Programming Perl, 3.2.48. gethostbyname
Programming Perl, 3.2.52. getnetbyname
Programming Perl, 7.2.62. Sys::Hostname - Try Every Conceivable Way to Get Hostname

hostpath (IO::Socket::UNIX) : Perl in a Nutshell, Chapter 13, Reference: hostpath

hosts file : Programming Perl, 3.2.49. gethostent

hosts, pinging : Programming Perl, 7.2.46. Net::Ping - Check Whether a Host Is Online

HotKey module : Perl Cookbook, 15.8. Using POSIX termios

hours : (see date and time)

HREF fields, substitutions for : Perl Cookbook, 20.15. Program: hrefsub

hrefsub program (example) : Perl Cookbook, 20.15. Program: hrefsub

HTML (Hypertext Markup Language)

converting ASCII to/from : Perl Cookbook, 20.4. Converting ASCII to HTML

extracting tags : Perl Cookbook, 20.6. Extracting or Removing HTML Tags

extracting URLs from : Perl Cookbook, 20.3. Extracting URLs

finding stale/fresh links : Perl Cookbook, 20.7. Finding Stale Links

formatting, shortcuts in CGI.pm : Perl Cookbook, 19.7. Formatting Lists and Tables with HTML Shortcuts

forms

Perl Cookbook, 19.0. Introduction
Learning Perl, 19.2. Your CGI Program in Context
Learning Perl, 19.6. Form Generation
automating submission : Perl Cookbook, 20.2. Automating Form Submission
elements of : Learning Perl, 19.7. Other Form Elements
saving/mailing : Perl Cookbook, 19.13. Saving a Form to a File or Mail Pipe
sticky widgets : Perl Cookbook, 19.11. Creating Sticky Widgets

putting links around URLs : Perl Cookbook, 6.21. Program: urlify

tags, generating with CGI.pm : Perl in a Nutshell, 10.1. HTML Tag Generation

templates : Perl Cookbook, 20.9. Creating HTML Templates

text substitutions : Perl Cookbook, 20.14. Program: htmlsub

translating pod to

Perl in a Nutshell, Chapter 4, Reference: pod2html
Perl in a Nutshell, 8.121. Pod::Html

:html method groups : Perl in a Nutshell, 10.2. Importing Method Groups

HTML modules : Perl in a Nutshell, 17.4. The HTML Module

HTML::Element : Perl in a Nutshell, 17.4.2. HTML::Element

HTML::Entities module : Perl Cookbook, 20.4. Converting ASCII to HTML

HTML::FormatPS : Perl in a Nutshell, 17.4.4. HTML::FormatPS

HTML::FormatText

Perl Cookbook, 20.5. Converting HTML to ASCII
Perl in a Nutshell, 17.4.5. HTML::FormatText

HTML::LinkExtor module : Perl Cookbook, 20.3. Extracting URLs

HTML::Parser

Perl in a Nutshell, 17.4. The HTML Module
Perl in a Nutshell, 17.4.1. HTML::Parser

HTML::TreeBuilder

Perl Cookbook, 20.5. Converting HTML to ASCII
Perl in a Nutshell, 17.4.3. HTML::TreeBuilder

:html2 and :html3 import tags : Learning Perl, 19.5. Less Typing

htmlsub program (example) : Perl Cookbook, 20.14. Program: htmlsub

HTTP (Hypertext Transfer Protocol)

debugging exchanges in : Perl Cookbook, 19.9. Debugging the Raw HTTP Exchange

methods

Perl Cookbook, 19.0. Introduction
Perl Cookbook, 19.1. Writing a CGI Script

request messages : Perl in a Nutshell, 17.1. LWP Overview

Win32::Internet functions for : Perl in a Nutshell, 19.7.3. HTTP Functions

HTTP() (Win32::Internet) : Perl in a Nutshell, Chapter 19, Reference: HTTP

HTTP modules

HTTP::Cookies module : Perl in a Nutshell, 17.3.6. HTTP::Cookies

HTTP::Cookies::Netscape module : Perl in a Nutshell, 17.3.6.1. HTTP::Cookies::Netscape

HTTP::Daemon module : Perl in a Nutshell, 17.3.7. HTTP::Daemon

HTTP::Daemon::ClientConn module : Perl in a Nutshell, 17.3.7.1. HTTP::Daemon::ClientConn methods

HTTP::Date module : Perl in a Nutshell, 17.3.5. HTTP::Date

HTTP::Headers module : Perl in a Nutshell, 17.3.3. HTTP::Headers

HTTP::Message module : Perl in a Nutshell, 17.3.8. HTTP::Message

HTTP::Request module

Perl in a Nutshell, 17.1. LWP Overview
Perl in a Nutshell, 17.3.1. HTTP::Request

HTTP::Response module

Perl in a Nutshell, 17.1. LWP Overview
Perl in a Nutshell, 17.3.2. HTTP::Response

HTTP::Status module : Perl in a Nutshell, 17.3.4. HTTP::Status

HTTP_ACCEPT variable : Perl in a Nutshell, 9.4. CGI Environment Variables

HTTP_COOKIE variable : Perl in a Nutshell, 9.4. CGI Environment Variables

HTTP_FROM variable : Perl in a Nutshell, 9.4. CGI Environment Variables

HTTP_REFERER variable : Perl in a Nutshell, 9.4. CGI Environment Variables

HTTP_USER_AGENT variable : Perl in a Nutshell, 9.4. CGI Environment Variables

Hubbard, John : Advanced Perl Programming, 18.6. A Detour into Fractals

human-readable databases : Learning Perl, 17.5. Variable-Length (Text) Databases

Hungarian notation : Advanced Perl Programming, 1.2.4. Dereferencing Multiple Levels of Indirection

HVs (hash values) : Advanced Perl Programming, 20.3.3. Hash Values (HVs)

hyperlinks

Perl Cookbook, 9.0. Introduction
Perl Cookbook, 20.7. Finding Stale Links

hyphen : (see - (hyphen))

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