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Index: H

-h option (perl): 3.2. Command-Line Options (Perl in a Nutshell)

h command (CPAN.pm): Chapter 2, Reference: h (Perl in a Nutshell)

h command (debugger): Chapter 6, Reference: h (Perl in a Nutshell)

for signals: 16.1. Signals (Programming Perl)

overload: 13.1. The overload Pragma (Programming Perl)

13.2. Overload Handlers (Programming Perl)

missing: (Programming Perl) 13.5. When an Overload Handler Is Missing (nomethod and fallback)

overloading,: 13.3. Overloadable Operators (Programming Perl)

handles: 1.2.1. Variable Syntax (Programming Perl)

directories: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)

references to: 8.2.4. Handle References (Programming Perl)

tied, base class definitons for: 32.1.14. Convenient Classes (Programming Perl)

handling

multiple clients: 12.3. Handling Multiple Clients (Advanced Perl Programming)

signals: 4.2.2. Signal Handlers (Advanced Perl Programming)

hard links: 9.0. Introduction (Perl Cookbook)

hard links, filenames: 29.2.85. link (Programming Perl)

hard references: 1.6.1. Reference Counts (Advanced Perl Programming)

3.2. The Arrow Operator (Programming Perl)

8.1. What Is a Reference? (Programming Perl)

8.2. Creating References (Programming Perl)

%SIG array: 16.1. Signals (Programming Perl)

using: 8.3. Using Hard References (Programming Perl)

closures: 8.3.7. Closures (Programming Perl)

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

closures: 22.1. The CPAN modules Directory (Programming Perl)

hash functions: 20.3.3.1. Inside HVs (Advanced Perl Programming)

hash prototype symbol (%): 4.7.5. Prototypes (Perl in a Nutshell)

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

hashDepth option (debugger): 20.3.3. Debugger Options (Programming Perl)

closures: 20.3.3. Debugger Options (Programming Perl)

hashes: 1.2.1. Variable Syntax (Programming Perl)

1.2.1.2. Pluralities (Programming Perl)

1.2.1.2.2. Hashes. (Programming Perl)

2.3. Built-in Data Types (Programming Perl)

2.9. Hashes (Programming Perl)

closures: 1.2.1. Variable Syntax (Programming Perl)

1.2.1.2. Pluralities (Programming Perl)

1.2.1.2.2. Hashes. (Programming Perl)

2.3. Built-in Data Types (Programming Perl)

2.9. Hashes (Programming Perl)

printing out in sorted order: 4.4.3. foreach Loops (Programming Perl)

anonymous

data structure for objects: 12.7. Managing Instance Data (Programming Perl)

references to: 12.4. Object Construction (Programming Perl)

8.2.2.2. The anonymous hash composer (Programming Perl)

binding DBM files to: 29.2.22. dbmopen (Programming Perl)

cascading conditionals, using instead of: 4.5.1. Case Structures (Programming Perl)

deleting values from: 29.2.24. delete (Programming Perl)

elements, giving temporary values to: 29.2.87. local (Programming Perl)

exists function and: 29.2.34. exists (Programming Perl)

flat lookup tables, providing access to: 9. Data Structures (Programming Perl)

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

%INC for modules: 11.1. Using Modules (Programming Perl)

initializing with x operator: 3.7. Multiplicative Operators (Programming Perl)

instead of linear searches: 24.2.1. Time Efficiency (Programming Perl)

inverting: 29.2.132. reverse (Programming Perl)

keys, finding number in: 2.9. Hashes (Programming Perl)

keys, returning list of: 29.2.79. keys (Programming Perl)

key/value pair precedence: 2.9. Hashes (Programming Perl)

key/value pairs: 2.3. Built-in Data Types (Programming Perl)

2.9. Hashes (Programming Perl)

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

1.2.1.2.2. Hashes. (Programming Perl)

multidimensional: 9.4. Hashes of Hashes (Programming Perl)

accessing and printing: 9.4.3. Access and Printing of a Hash of Hashes (Programming Perl)

generation of: 9.4.2. Generation of a Hash of Hashes (Programming Perl)

names for: 2.4. Variables (Programming Perl)

of arrays: 9.2. Hashes of Arrays (Programming Perl)

9.3. Arrays of Hashes (Programming Perl)

access and printing of: 9.2.3. Access and Printing of a Hash of Arrays (Programming Perl)

generating: 9.2.2. Generation of a Hash of Arrays (Programming Perl)

9.3.2. Generation of an Array of Hashes (Programming Perl)

of complex records: 9.6.3. Generation of a Hash of Complex Records (Programming Perl)

output style, changing in debugger: 20.3.3. Debugger Options (Programming Perl)

passing by reference into or out of functions: 6.3. Passing References (Programming Perl)

Perl data organization in: 9.1.5. Common Mistakes (Programming Perl)

processing, functions for: 29.1. Perl Functions by Category (Programming Perl)

references as keys: 8.5.1. References Don't Work as Hash Keys (Programming Perl)

references to: 8.1. What Is a Reference? (Programming Perl)

restricted, implementing: 12.7.5. Using Closures for Private Objects (Programming Perl)

returning key/value pairs: 29.2.30. each (Programming Perl)

returning values of: 29.2.194. values (Programming Perl)

%SIG, references to signal handlers: 16.1. Signals (Programming Perl)

symbol tables: 10.1. Symbol Tables (Programming Perl)

key/value pairs in: 10.1. Symbol Tables (Programming Perl)

typeglobs in: 10.1. Symbol Tables (Programming Perl)

taint in: 23.1. Handling Insecure Data (Programming Perl)

tying: 14. Tied Variables (Programming Perl)

14.3. Tying Hashes (Programming Perl)

methods for: 14.3.1. Hash-Tying Methods (Programming Perl)

Tie::Hash module, providing base class definitions: 32.1.14. Convenient Classes (Programming Perl)

hashes (associative arrays): 1.6. A View of the Internals (Advanced Perl Programming)

4.6. Extracting Unique Elements from a List (Perl Cookbook)

5.0. Introduction (Perl Cookbook)

4.2. Data Types and Variables (Perl in a Nutshell)

4.2.4.2. Hashes (Perl in a Nutshell)

adding elements to: 5.1. Adding an Element to a Hash (Perl Cookbook)

10.11. Prototyping Functions (Perl Cookbook)

anonymous: 1.2.3. References to Anonymous Storage (Advanced Perl Programming)

1.3.2. Final Shortcut: Omit Arrows Between Subscripts (Advanced Perl Programming)

11.0. Introduction (Perl Cookbook)

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

binding: 9.3. Tying Hashes (Advanced Perl Programming)

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

dutree program: 5.16. Program: dutree (Perl Cookbook)

examples: 2.3.1. Representation (Advanced Perl Programming)

finding most common anything: 5.14. Finding the Most Common Anything (Perl Cookbook)

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

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

inverting: 5.8. Inverting a Hash (Perl Cookbook)

merging: 5.10. Merging Hashes (Perl Cookbook)

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

named: 1.3. Nested Data Structures (Advanced Perl Programming)

of arrays: 11.2. Making Hashes of Arrays (Perl Cookbook)

of hashes: 2.2.1. Hash of Hashes Representation (Advanced Perl Programming)

of symbolic references: 1.5. Symbolic References (Advanced Perl Programming)

passing to subroutines: 1.2.1. Passing Arrays and Hashes to Subroutines (Advanced Perl Programming)

presizing: 5.13. Presizing a Hash (Perl Cookbook)

printing: 5.5. Printing a Hash (Perl Cookbook)

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

references as elements: 5.12. Hashing References (Perl Cookbook)

references to: 1.1.5. References to Hashes (Advanced Perl Programming)

1.6.2. Array/Hash References Versus Element References (Advanced Perl Programming)

11.3. Taking References to Hashes (Perl Cookbook)

removing/deleting elements from: 5.3. Deleting from a Hash (Perl Cookbook)

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

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

returning keys and values: 5.2. Testing for the Presence of a Key in a Hash (Perl Cookbook)

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

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

sorting elements of: 5.9. Sorting a Hash (Perl Cookbook)

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

tied: 13.15. Creating Magic Variables with tie (Perl Cookbook)

traversing: 5.4. Traversing a Hash (Perl Cookbook)

head()

LWP::Simple module: 20.7. Finding Stale Links (Perl Cookbook)

Chapter 17, Reference: head (Perl in a Nutshell)

17.2.2. LWP::Simple (Perl in a Nutshell)

Mail::Internet module: Chapter 14, Reference: head (Perl in a Nutshell)

Chapter 14, Reference: Head (Perl in a Nutshell)

14.2.8.1. Counting messages (Perl in a Nutshell)

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

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

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

HEAD method: 19.0. Introduction (Perl Cookbook)

HeadAndBody() (Mail::POP3Client): Chapter 14, Reference: HeadAndBody (Perl in a Nutshell)

14.2.8.3. Retrieving the message body (Perl in a Nutshell)

header()

CGI.pm module: Chapter 10, Reference: header (Perl in a Nutshell)

10. The CGI.pm Module (Perl in a Nutshell)

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

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

(see also modules)

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

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

headers, format names: 7.2. Footers (Programming Perl)

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

-height option

place geometry manager: 18.2.3. The Place Geometry Manager (Perl in a Nutshell)

widgets: 18.3. Common Widget Configuration Options (Perl in a Nutshell)

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

Hello, world (program example)

HELO command (SMTP): 14.1.2. The SMTP Protocol and the SMTP Session (Perl in a Nutshell)

help

Perl references: Other Books (Perl Cookbook)

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

sorting =head1 sections: 15.19. Program: tkshufflepod (Perl Cookbook)

web references: 19.0. Introduction (Perl Cookbook)

help desk, using email for: 8.3.4. Support Mail Augmentation (Perl for System Administration)

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

here documents: 17.4.2. Template Parser (Advanced Perl Programming)

1.0. Introduction (Perl Cookbook)

2.6.6. "Here" Documents (Programming Perl)

indentation of: 2.6.6. "Here" Documents (Programming Perl)

indenting: 1.11. Indenting Here Documents (Perl Cookbook)

semicolon (;), omitting trailing: 24.1.1. Universal Blunders (Programming Perl)

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

hex(): 2.16. Converting Between Octal and Hexadecimal (Perl Cookbook)

Chapter 5, Reference: hex (Perl in a Nutshell)

hex function: 29.2.73. hex (Programming Perl)

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

hexadecimal characters: 2.6.1. Numeric Literals (Programming Perl)

hexadecimal numbers: 2.16. Converting Between Octal and Hexadecimal (Perl Cookbook)

29.2.73. hex (Programming Perl)

character numbers, specifying as: 5.3.2. Specific Characters (Programming Perl)

HFS (Hierarchical File System): 2.2.3. MacOS (Perl for System Administration)

hidden() (CGI.pm): 19.12. Writing a Multiscreen CGI Script (Perl Cookbook)

Chapter 10, Reference: hidden (Perl in a Nutshell)

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

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

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

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

hints, compiler: 28.2. Special Variables in Alphabetical Order (Programming Perl)

HiRes module: 9.1.1. Example: Stopwatch (Advanced Perl Programming)

history, command: 20.1. Using the Debugger (Programming Perl)

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

history of Perl: 27.1. History Made Practical (Programming Perl)

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

hiweb program (example): 19.1. Writing a CGI Script (Perl Cookbook)

HList widgets: A.8. HList - Hierarchical List (Advanced Perl Programming)

14.3.11. HList (Advanced Perl Programming)

home directory: 29.2.9. chdir (Programming Perl)

home directory field (Unix): 3.1.1. The Classic Unix Password File (Perl for System Administration)

home page, Perl: 0.6.1. Perl on the Web (Programming Perl)

HOME variable: 3.3. Environment Variables (Perl in a Nutshell)

19.2. Environment Variables (Programming Perl)

hopdelta program: 3.11. Program: hopdelta (Perl Cookbook)

host()

Mail::Address module: Chapter 14, Reference: host (Perl in a Nutshell)

14.2.6. Parse Email Addresses with Mail::Address (Perl in a Nutshell)

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

host files

generating from a database

error checking while: 5.1.2. Error Checking the Host File Generation Process (Perl for System Administration)

improving output while: 5.1.3. Improving the Host File Output (Perl for System Administration)

generating, modules for: 6.4.10. Putting It All Together (Perl for System Administration)

Macintosh HD\:System Folder\:Preferences\:hosts: 5.1. Host Files (Perl for System Administration)

parsing: 5.1. Host Files (Perl for System Administration)

reading from Perl: 5.1. Host Files (Perl for System Administration)

source control systems and: 5.1.4. Incorporating a Source Code Control System (Perl for System Administration)

\\\\$systemroot$\\\\system32\\\\drivers\\\\etc\\\\hosts file: 5.1. Host Files (Perl for System Administration)

Unix: 5.1. Host Files (Perl for System Administration)

5.1. Host Files (Perl for System Administration)

Windows NT: 5.2.2. Windows Internet Name Server ( WINS) (Perl for System Administration)

h2xs program: 10.5. Preventing Suspicious Activities (Perl for System Administration)

Host() (Mail::POP3Client): Chapter 14, Reference: Host (Perl in a Nutshell)

14.2.8.2. Getting and setting the host and port (Perl in a Nutshell)

hostnames

getting from network addresses: 29.2.47. gethostbyaddr (Programming Perl)

Sys::Hostname module: 32.1.7. Operating System Interfaces (Programming Perl)

translating to addresses: 29.2.48. gethostbyname (Programming Perl)

29.2.52. getnetbyname (Programming Perl)

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

hosts file (see /etc/hosts file)

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

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

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

HotKey module: 15.8. Using POSIX termios (Perl Cookbook)

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

h2ph tool: 12.14. Using h2ph to Translate C #include Files (Perl Cookbook)

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

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

HTML

CGI module, generation of: 32.1.9. World Wide Web (Programming Perl)

code, producing nicely formatted: 32.1.9. World Wide Web (Programming Perl)

Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)

pod files, converting to: 32.1.16. Documentation Support (Programming Perl)

HTML (Hypertext Markup Language)

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

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

extracting URLs from: 20.3. Extracting URLs (Perl Cookbook)

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

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

forms: 19.0. Introduction (Perl Cookbook)

automating submission: 20.2. Automating Form Submission (Perl Cookbook)

saving/mailing: 19.13. Saving a Form to a File or Mail Pipe (Perl Cookbook)

sticky widgets: 19.11. Creating Sticky Widgets (Perl Cookbook)

putting links around URLs: 6.21. Program: urlify (Perl Cookbook)

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

templates: 20.9. Creating HTML Templates (Perl Cookbook)

text substitutions: 20.14. Program: htmlsub (Perl Cookbook)

translating pod to: Chapter 4, Reference: pod2html (Perl in a Nutshell)

8.121. Pod::Html (Perl in a Nutshell)

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

HTML modules: 17.4. The HTML Module (Perl in a Nutshell)

HTML::Element: 17.4.2. HTML::Element (Perl in a Nutshell)

HTML::Entities module: 20.4. Converting ASCII to HTML (Perl Cookbook)

HTML::FormatPS: 17.4.4. HTML::FormatPS (Perl in a Nutshell)

HTML::FormatText: 20.5. Converting HTML to ASCII (Perl Cookbook)

17.4.5. HTML::FormatText (Perl in a Nutshell)

HTML::LinkExtor module: 20.3. Extracting URLs (Perl Cookbook)

HTML::Parser: 17.4. The HTML Module (Perl in a Nutshell)

17.4.1. HTML::Parser (Perl in a Nutshell)

HTML::TreeBuilder: 20.5. Converting HTML to ASCII (Perl Cookbook)

17.4.3. HTML::TreeBuilder (Perl in a Nutshell)

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

HTTP

cookies, setting and getting: 32.1.9. World Wide Web (Programming Perl)

links, searching for: 1.7. Regular Expressions (Programming Perl)

22.1. The CPAN modules Directory (Programming Perl)

HTTP (Hypertext Transfer Protocol)

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

methods: 19.0. Introduction (Perl Cookbook)

19.1. Writing a CGI Script (Perl Cookbook)

request messages: 17.1. LWP Overview (Perl in a Nutshell)

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

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

HTTP modules

HTTP::Cookies module: 17.3.6. HTTP::Cookies (Perl in a Nutshell)

HTTP::Cookies::Netscape module: 17.3.6.1. HTTP::Cookies::Netscape (Perl in a Nutshell)

HTTP::Daemon module: 17.3.7. HTTP::Daemon (Perl in a Nutshell)

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

HTTP::Date module: 17.3.5. HTTP::Date (Perl in a Nutshell)

HTTP::Headers module: 17.3.3. HTTP::Headers (Perl in a Nutshell)

HTTP::Message module: 17.3.8. HTTP::Message (Perl in a Nutshell)

HTTP::Request module: 17.1. LWP Overview (Perl in a Nutshell)

17.3.1. HTTP::Request (Perl in a Nutshell)

HTTP::Response module: 17.1. LWP Overview (Perl in a Nutshell)

17.3.2. HTTP::Response (Perl in a Nutshell)

HTTP::Status module: 17.3.4. HTTP::Status (Perl in a Nutshell)

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

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

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

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

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

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

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

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

20.3.3. Hash Values (HVs) (Advanced Perl Programming)

links, searching for: 21.2. Internal Data Types (Programming Perl)

h2xs: 12.8. Preparing a Module for Distribution (Perl Cookbook)

12.15. Using h2xs to Make a Module with C Code (Perl Cookbook)

21.3.1. XS and XSUBs (Programming Perl)

21.3.2. Creating Extensions (Programming Perl)

22.3. Creating CPAN Modules (Programming Perl)

hyperlinks: 9.0. Introduction (Perl Cookbook)

20.7. Finding Stale Links (Perl Cookbook)

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

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