Index: I

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## Index: I

i command (CPAN.pm): 2.4.4. Installing Modules with the CPAN Module (Perl in a Nutshell)
-i command-line option
  modifying files with: 7.16.2. Solution (Perl Cookbook)
  writing filters: 7.14.3.2. Command-line options (Perl Cookbook)
-I command-line switch: 12.8.2. Solution (Perl Cookbook)
-i (in-place editing) command-line switch: 19.1.3. Switches (Programming Perl)
-I (include path) command-line switch: 19.1.3. Switches (Programming Perl)
I<\\> interior sequence (pod): 4.13.2. Interior Sequences (Perl in a Nutshell)
/i modifier: 9.2.1. Case-insensitive Matching with /i (Learning Perl)
  s/// substitution operator and: 9.6.3. Option Modifiers (Learning Perl)
-I option (perlcc): 3.4. The Perl Compiler (Perl in a Nutshell)
/i pattern modifier: 5.2.1. Pattern Modifiers (Programming Perl)
  5.2.2. The m// Operator (Matching) (Programming Perl)
  5.2.3. The s/// Operator (Substitution) (Programming Perl)
i pattern match modifier: 4.6.1. Pattern-Matching Operators (Perl in a Nutshell)
  4.6.8. Extended Regular Expressions (Perl in a Nutshell)
/i pattern-matching modifier: 6.. Pattern-Matching Modifiers (Perl Cookbook)
$^I variable: 16.4. Variable-length (Text) Databases (Learning Perl)
iconbitmap( ) (Frame widget): 21.18.1. Toplevel Methods (Perl in a Nutshell)
iconify( ) (Frame widget): 21.18.1. Toplevel Methods (Perl in a Nutshell)
iconmask( ) (Frame widget): 21.18.1. Toplevel Methods (Perl in a Nutshell)
iconname( ) (Frame widget): 21.18.1. Toplevel Methods (Perl in a Nutshell)
iconposition( ) (Frame widget): 21.18.1. Toplevel Methods (Perl in a Nutshell)
iconwindow( ) (Frame widget): 21.18.1. Toplevel Methods (Perl in a Nutshell)
icursor( ) (Entry): 21.8.2. Entry Methods (Perl in a Nutshell)
idempotency: 19.. Behind the Scenes (Perl Cookbook)
identifiers: 2.2. Molecules (Programming Perl)
  2.5. Names (Programming Perl)
  29.2.63. getpwuid (Programming Perl)
  Glossary (Programming Perl)
  bare, barewords vs.: 2.6.4. Or Leave the Quotes Out Entirely (Programming Perl)
  effective UID or GID, setting back to real: 23.1.3. Accessing Commands and Files Under Reduced Privileges (Programming Perl)
  effective user or group IDs, differing from real: 23.1. Handling Insecure Data (Programming Perl)
  enclosing in braces: 2.6.2. String Literals (Programming Perl)
  GID (group ID): Glossary (Programming Perl)
  line-oriented quoting: 2.6.6. "Here" Documents (Programming Perl)
  names vs.: 2.5. Names (Programming Perl)
  Perl modules: 11.1. Using Modules (Programming Perl)
  PIDs, guessing: 23.2.3. Temporary Files (Programming Perl)
  process group ID: 16.1.1. Signaling Process Groups (Programming Perl)
  processes (pid): 29.2.104. open (Programming Perl)
  semaphores: 29.2.143. semget (Programming Perl)
  shared memory segments: 29.2.151. shmget (Programming Perl)
  single quotes (') in: 2.6.2. String Literals (Programming Perl)
  starting with underscore (_), changes in Perl versions: 24.1.5. Previous Perl Traps (Programming Perl)
  thread IDs: 17.2.1.5. Identifying threads (Programming Perl)
  Unicode alphanumeric characters, containing: 15.2. Effects of Character Semantics (Programming Perl)
identifiers, package: 10. Packages (Programming Perl)
  in package symbol table: 10. Packages (Programming Perl)
identify( )
  Scale widget: 21.13.1. Scale Methods (Perl in a Nutshell)
  Scrollbar widget: 21.9.1. Scrollbar Methods (Perl in a Nutshell)
ideographic unary operators: 3.5. Ideographic Unary Operators (Programming Perl)
ideographs: 1.7. Regular Expressions (Programming Perl)
  matching with \w: 15.2. Effects of Character Semantics (Programming Perl)
idioms, Perl: 24.4. Fluent Perl (Programming Perl)
if control structure: 2.7. The if Control Structure (Learning Perl)
  else clause and: 10.1.1. The else Clause with unless (Learning Perl)
  unless control structure and: 10.1. The unless Control Structure (Learning Perl)
If-Modified-Since header: 20.10.3. Discussion (Perl Cookbook)
if modifier: 10.3. Expression Modifiers (Learning Perl)
  4.3.1.4. Modifiers (Perl in a Nutshell)
  4.1. Simple Statements (Programming Perl)
if module: 8.124. if (Perl in a Nutshell)
if statement: 4.3.1. Conditionals and Loops (Perl in a Nutshell)
if statements: 1.5.5. Logical Operators (Programming Perl)
  1.6.1.1. The if and unless statements (Programming Perl)
  4.3. if and unless Statements (Programming Perl)
  C language, differences from Perl: 24.1.3. C Traps (Programming Perl)
  in case structure: 4.5.1. Case Structures (Programming Perl)
  logical operators and: 1.5.5. Logical Operators (Programming Perl)
if-then-else test, ternary operator for: 10.9.2. The Ternary Operator, ?: (Learning Perl)
IGNORE pseudosignal: 16.1. Signals (Programming Perl)
ignore_text( ) (HTML::Parser): 20.4.4. HTML::TreeBuilder (Perl in a Nutshell)
ignore_unknown( ) (HTML::Parser): 20.4.4. HTML::TreeBuilder (Perl in a Nutshell)
ihave( ) (Net::NNTP): 17.2.2. Net::NNTP Reference (Perl in a Nutshell)
image files, Image::Size module for: B.5.7. The Image::Size Module (Learning Perl)
-image option (widgets): 21.3. Common Widget Configuration Options (Perl in a Nutshell)
image_button( ) (CGI.pm): 10.7. CGI.pm Reference (Perl in a Nutshell)
Image::Magick module: 15.19.2. Solution (Perl Cookbook)
images
  adding text to: 15.20.1. Problem (Perl Cookbook)
  thumbnailing: 15.19.1. Problem (Perl Cookbook)
Image::Size module: B.5.7. The Image::Size Module (Learning Perl)
imaginary numbers: 2.14.1. Problem (Perl Cookbook)
  B.9.2. Imaginary and Complex Numbers (Learning Perl)
impatience: Glossary (Programming Perl)
imperative programming style: 5.10.3. Programmatic Patterns (Programming Perl)
implementing sparse arrays: 4.4.1. Problem (Perl Cookbook)
implicit( ) (HTML::Parser): 20.4.3. HTML::Element (Perl in a Nutshell)
implicit method invocation: 12.3. Method Invocation (Programming Perl)
implicit referencing or dereferencing: 8.1. What Is a Reference? (Programming Perl)
implicit_tags( ) (HTML::Parser): 20.4.4. HTML::TreeBuilder (Perl in a Nutshell)
import function: 11.1. Using Modules (Programming Perl)
  11.2.1.1. Exporting without using Exporter's import method (Programming Perl)
  29.2.74. import (Programming Perl)
import lists: 13.8.2. Using Only Some Functions from a Module (Learning Perl)
import method: Glossary (Programming Perl)
  overloading constants: 13.6. Overloading Constants (Programming Perl)
importing: 4.7. Global Declarations (Programming Perl)
  -nosticky option: 12.11. Custom Import Routines (Learning Perl Objects, References and Modules)
  custom routines: 12.11. Custom Import Routines (Learning Perl Objects, References and Modules)
  Exporter module and: 12.8. Importing with Exporter (Learning Perl Objects, References and Modules)
    12.8. Importing with Exporter (Learning Perl Objects, References and Modules)
  File::Basename module and: 12.2. Selecting What to Import (Learning Perl Objects, References and Modules)
  semantics into package: 29.2.192. use (Programming Perl)
  subroutines: 12.6. What use Is Doing (Learning Perl Objects, References and Modules)
    12.9. @EXPORT and @EXPORT_OK (Learning Perl Objects, References and Modules)
  subroutines from another module: 6.1. Syntax (Programming Perl)
  symbols from one package to another: 10.1. Symbol Tables (Programming Perl)
  use operation and: 12.6. What use Is Doing (Learning Perl Objects, References and Modules)
importing from modules: 10.14.3. Discussion (Perl Cookbook)
  12.. Modules (Perl Cookbook)
importing symbols: 11.2.1. Module Privacy and the Exporter (Programming Perl)
  (see also Exporter module; exporting symbols)
import_names( ) (CGI.pm): 10.7. CGI.pm Reference (Perl in a Nutshell)
in interprocess communication
  bidirectional communication: 16.3.3. Bidirectional Communication (Programming Perl)
I18N modules: 8.120. I18N::Collate (Perl in a Nutshell)
  I18N::Collate module: 8.120. I18N::Collate (Perl in a Nutshell)
  I18N::Langinfo module: 8.121. I18N::Langinfo (Perl in a Nutshell)
  I18N::LangTags module: 8.122. I18N::LangTags (Perl in a Nutshell)
  I18N::LangTags::List module: 8.123. I18N::LangTags::List (Perl in a Nutshell)
-in option
  form geometry manager: 21.2.4. The form Geometry Manager (Perl in a Nutshell)
  grid geometry manager: 21.2.2. The grid Geometry Manager (Perl in a Nutshell)
  pack geometry manager: 21.2.1. The pack Geometry Manager (Perl in a Nutshell)
  place geometry manager: 21.2.3. The place Geometry Manager (Perl in a Nutshell)
in( ) (Win32::OLE): 23.2.2. Win32::OLE Functions (Perl in a Nutshell)
INADDR_ANY: 17.1.3. Discussion (Perl Cookbook)
  17.16.2. Solution (Perl Cookbook)
INADDR_ANY( ) (Socket): 15.1.4. Socket Module Functions (Perl in a Nutshell)
INADDR_BROADCAST( ) (Socket): 15.1.4. Socket Module Functions (Perl in a Nutshell)
INADDR_LOOPBACK( ) (Socket): 15.1.4. Socket Module Functions (Perl in a Nutshell)
INADDR_NONE( ) (Socket)
  .25i: 15.1.4. Socket Module Functions (Perl in a Nutshell)
@INC array: 12.8.3. Discussion (Perl Cookbook)
  4.4.2. Global Special Arrays and Hashes (Perl in a Nutshell)
  11.1. Using Modules (Programming Perl)
  28.2. Special Variables in Alphabetical Order (Programming Perl)
  32.1.17. Module Installation Support (Programming Perl)
  require operator and: 2.5. require and @INC (Learning Perl Objects, References and Modules)
  use operation and: 12.7. Setting the Path at the Right Time (Learning Perl Objects, References and Modules)
%INC hash: 4.4.2. Global Special Arrays and Hashes (Perl in a Nutshell)
  11.1. Using Modules (Programming Perl)
  28.2. Special Variables in Alphabetical Order (Programming Perl)
I18N::Collate module: 32.1.6. Internationalization and Locale (Programming Perl)
incrementing variables: 1.5.4. Unary Arithmetic Operators (Programming Perl)
indents (see whitespace)
index( ): 5. Function Reference (Perl in a Nutshell)
  Entry widget: 21.8.2. Entry Methods (Perl in a Nutshell)
  Listbox widget: 21.10.2. Listbox Methods (Perl in a Nutshell)
  Menu widget: 21.15.2. Menu Methods (Perl in a Nutshell)
  Text widget: 21.11.2. Text Methods (Perl in a Nutshell)
index function: 15.1. Finding a Substring with index (Learning Perl)
  29.2.75. index (Programming Perl)
  Glossary (Programming Perl)
  using with substr operator: 15.2. Manipulating a Substring with substr (Learning Perl)
indexing arrays: 9.2.3. Access and Printing of a Hash of Arrays (Programming Perl)
indexing elements: 3. Lists and Arrays (Learning Perl)
-indicatoron option
  Checkbutton widget: 21.5. The Checkbutton Widget (Perl in a Nutshell)
  Menubutton widget: 21.14. The Menubutton Widget (Perl in a Nutshell)
    21.14.1. Menu Item Options (Perl in a Nutshell)
  Optionmenu widget: 21.16. The Optionmenu Widget (Perl in a Nutshell)
  Radiobutton widget: 21.6. The Radiobutton Widget (Perl in a Nutshell)
indices
  fixed-length records program: 8.27. Program: Flat File Indexes (Perl Cookbook)
  of hash elements: 5.. Introduction (Perl Cookbook)
indices, sorting with: 7.2. Sorting with Indices (Learning Perl Objects, References and Modules)
  7.2. Sorting with Indices (Learning Perl Objects, References and Modules)
indirect filehandle read: 12.3. An Alternate Syntax for Globbing (Learning Perl)
indirect filehandles: 29.2.104. open (Programming Perl)
  Glossary (Programming Perl)
indirect notation: 13.. A Warning on Indirect Object Notation (Perl Cookbook)
indirect object notation: 7.5.3. Discussion (Perl Cookbook)
  10.3. Indirect Object Notation (Learning Perl Objects, References and Modules)
indirect object slot: 12.3.2. Method Invocation Using Indirect Objects (Programming Perl)
indirect object syntax: 12.3.2. Method Invocation Using Indirect Objects (Programming Perl)
  ambiguities in: 12.3.3. Syntactic Snafus with Indirect Objects (Programming Perl)
indirect objects: Glossary (Programming Perl)
  explicit path, passing in slot: 23.1. Handling Insecure Data (Programming Perl)
indirection: 2.5.1. Name Lookups (Programming Perl)
  8. References (Programming Perl)
  Glossary (Programming Perl)
  Glossary (Programming Perl)
  (see also hard references; symbolic references)
  applying: 5.6. Applying a Bit of Indirection (Learning Perl Objects, References and Modules)
  between class use and implementation: 12.3. Method Invocation (Programming Perl)
  sorting indices: 7.2. Sorting with Indices (Learning Perl Objects, References and Modules)
inequality (see equality operators[semi] relational operators)
inet_aton( ) (Socket): 15.1.4. Socket Module Functions (Perl in a Nutshell)
inet_ntoa( ): 17.. Introduction (Perl Cookbook)
  18.1.2. Solution (Perl Cookbook)
inet_ntoa function: 29.2.47. gethostbyaddr (Programming Perl)
inet_ntoa( ) (Socket): 15.1.4. Socket Module Functions (Perl in a Nutshell)
infinite loops: 4.4.2. for Loops (Programming Perl)
infix (->) notation: 11.. References (Perl Cookbook)
infix dereference (-\: 7.4. Object Syntax (Perl in a Nutshell)
infix dereference (->) operator: 4.5.1. The Arrow Operator (Perl in a Nutshell)
  4.8.2.1. Arrow dereferencing (Perl in a Nutshell)
infix dereference operator (see arrow operator)
infix operators: 1.5. Operators (Programming Perl)
  Glossary (Programming Perl)
Info( ) (Win32::Console): 22.2. Win32::Console (Perl in a Nutshell)
inheritance: 13.. Inheritance (Perl Cookbook)
  13.10.1. Problem (Perl Cookbook)
  12.1. Brief Refresher on Object-Oriented Lingo (Programming Perl)
  Glossary (Programming Perl)
  base class, establishing at compile time: 32.1.13. Perl Language Extensions and Internals (Programming Perl)
  class: 10. Packages (Programming Perl)
    12.5. Class Inheritance (Programming Perl)
    single or multiple: 12.5. Class Inheritance (Programming Perl)
  class accessors: 12.8. Managing Class Data (Programming Perl)
  classes and objects
    pseudohash implementation and: 12.7.1. Field Declarations with use fields (Programming Perl)
  code reusability through: 8.6. Overriding the Methods (Learning Perl Objects, References and Modules)
  composition versus: 10.4. Additional Instance Variables in Subclasses (Learning Perl Objects, References and Modules)
  constructors: 12.4.1. Inheritable Constructors (Programming Perl)
  constructors and: 9.5. Inheriting the Constructor (Learning Perl Objects, References and Modules)
    9.5. Inheriting the Constructor (Learning Perl Objects, References and Modules)
  DESTROY method and: 10.2. Beating a Dead Horse (Learning Perl Objects, References and Modules)
    10.2. Beating a Dead Horse (Learning Perl Objects, References and Modules)
  through @ISA array: 12.5.1. Inheritance Through @ISA (Programming Perl)
  isa method testing: 11.2. Testing Your Objects for Good Behavior (Learning Perl Objects, References and Modules)
  @ISA variable and: 8.5. A Few Notes About @ISA (Learning Perl Objects, References and Modules)
  method invocation and: 8.4. Calling a Second Method to Simplify Things (Learning Perl Objects, References and Modules)
    8.4. Calling a Second Method to Simplify Things (Learning Perl Objects, References and Modules)
  modules, from Exporter class: 11.2.1. Module Privacy and the Exporter (Programming Perl)
  multiple inheritance: 11.6. Multiple Inheritance (Learning Perl Objects, References and Modules)
  overloading and: 13.8. Inheritance and Overloading (Programming Perl)
  restricted access and: 12.7.5. Using Closures for Private Objects (Programming Perl)
inhibit_exit option (debugger): 20.3.3. Debugger Options (Programming Perl)
INIT blocks: 18.1. The Life Cycle of a Perl Program (Programming Perl)
  initializing variables before calling subroutine: 6.2.3. Scoping Issues (Programming Perl)
  order of running: 18.7. Avant-Garde Compiler, Retro Interpreter (Programming Perl)
    18.7. Avant-Garde Compiler, Retro Interpreter (Programming Perl)
Init handler (Expat): 13.3. Expat Handlers (Perl in a Nutshell)
init program: 29.2.56. getppid (Programming Perl)
initial caps (see capitalization)
initialization
  debugger, customizing with init files: 20.3.2. Customizing with Init Files (Programming Perl)
initialization expressions: 4.4.2. for Loops (Programming Perl)
initializers (see constructors)
initializing
  arrays and hash slices: 3.7. Multiplicative Operators (Programming Perl)
  arrays and lists: 4.1.1. Problem (Perl Cookbook)
  hash variables: 2.9. Hashes (Programming Perl)
  hashes: 5.. Introduction (Perl Cookbook)
  modules: 12.7.1. Problem (Perl Cookbook)
  objects: 12.4.2. Initializers (Programming Perl)
  variables before calling subroutines: 6.2.3. Scoping Issues (Programming Perl)
initializing NNTP clients: 17.2.1. Initializing the NNTP Client (Perl in a Nutshell)
initializing sockets: 15.1.1. Initializing a Socket (Perl in a Nutshell)
Inline::C module: 12.19.2. Solution (Perl Cookbook)
inlining constant functions: 6.4.1. Inlining Constant Functions (Programming Perl)
  preventing inlining: 6.4.1. Inlining Constant Functions (Programming Perl)
inner( ): 10.16.3. Discussion (Perl Cookbook)
$ino file statistic: 29.2.165. stat (Programming Perl)
$ino (inode number): 11.6.1. The stat and lstat Functions (Learning Perl)
inode structure: 9.. Introduction (Perl Cookbook)
inodes: 13.3. Links and Files (Learning Perl)
inplace editing ($^I, $INPLACE_EDIT): 19.1.3. Switches (Programming Perl)
inplace edits with $^I: 28.2. Special Variables in Alphabetical Order (Programming Perl)
$INPLACE_EDIT ($^I) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)
input: 6. I/O Basics (Learning Perl)
  29.2.38. fileno (Programming Perl)
  (see also STDIN filehandle)
  checking file descriptors for: 29.2.141. select (ready file descriptors) (Programming Perl)
  comma-separated, parsing: 1.20.1. Problem (Perl Cookbook)
  controlling for other programs: 16.8.1. Problem (Perl Cookbook)
    16.9.1. Problem (Perl Cookbook)
  debugger, setting: 20.4. Unattended Execution (Programming Perl)
  editing: 15.11.1. Problem (Perl Cookbook)
  executing shell commands from: 19.5.1. Problem (Perl Cookbook)
  expanding variables in: 1.12.1. Problem (Perl Cookbook)
  Expect-controlled programs and: 15.13.3. Discussion (Perl Cookbook)
  extracting variable-length fields: 8.9.1. Problem (Perl Cookbook)
  files, locating end with eof: 19.1.3. Switches (Programming Perl)
  files, open mode for: 29.2.104. open (Programming Perl)
  from HTML forms [input
    HTML forms (see CGI programming)
  functions dealing with: 29.1. Perl Functions by Category (Programming Perl)
  ioctl function: 29.2.77. ioctl (Programming Perl)
  line input operator: 7.. I/O Operations (Perl Cookbook)
    8.. Basic Operations (Perl Cookbook)
  managing multiple streams: 17.19.1. Problem (Perl Cookbook)
  operators: 2.11. Input Operators (Programming Perl)
  parsing command-line arguments: 15.1.1. Problem (Perl Cookbook)
  pipes: 16.3. Pipes (Programming Perl)
    16.3. Pipes (Programming Perl)
    bidirectional: 16.3.3. Bidirectional Communication (Programming Perl)
    multistage pipelines: 16.3.1. Anonymous Pipes (Programming Perl)
    tridirectional: 16.3.3. Bidirectional Communication (Programming Perl)
  preprocessing: 16.6.1. Problem (Perl Cookbook)
  random-access I/O: 8.12.1. Problem (Perl Cookbook)
  reading
    from keyboard: 15.6.1. Problem (Perl Cookbook)
    from other programs: 16.4.1. Problem (Perl Cookbook)
    passwords: 15.10.1. Problem (Perl Cookbook)
    records with pattern separators: 6.7.1. Problem (Perl Cookbook)
    STDERR from programs: 16.7.1. Problem (Perl Cookbook)
  reading with diamond operator: 6.2. Input from the Diamond Operator (Learning Perl)
  record separator (see $/ variable)
  single-character, buffered and unbuffered: 29.2.43. getc (Programming Perl)
  waiting, checking for: 15.9.1. Problem (Perl Cookbook)
  while control structure shortcut for: 6.1. Input from Standard Input (Learning Perl)
  XSUBs: 21.3.3. XSUB Input and Output (Programming Perl)
input filehandles: 1.4. Filehandles (Programming Perl)
input, functions for: 4.4.1. Global Special Variables (Perl in a Nutshell)
  5.1. Perl Functions by Category (Perl in a Nutshell)
<input\\> tag: 9.1. A Typical CGI Interaction (Perl in a Nutshell)
Input( ) (Win32::Console): 22.2. Win32::Console (Perl in a Nutshell)
InputChar( ) (Win32::Console): 22.2. Win32::Console (Perl in a Nutshell)
InputCP( ) (Win32::Console): 22.2. Win32::Console (Perl in a Nutshell)
$INPUT_LINE_NUMBER: 28.2. Special Variables in Alphabetical Order (Programming Perl)
$INPUT_LINE_NUMBER ($.) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)
input/output (I/O): 6. I/O Basics (Learning Perl)
  6. I/O Basics (Learning Perl)
  filehandles and: 11.1. What Is a Filehandle? (Learning Perl)
$INPUT_RECORD_SEPARATOR: 28.2. Special Variables in Alphabetical Order (Programming Perl)
$INPUT_RECORD_SEPARATOR ($/) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)
insecure dependency errors: 23.1. Handling Insecure Data (Programming Perl)
insert( )
  Entry widget: 21.8.2. Entry Methods (Perl in a Nutshell)
  Listbox widget: 21.10.2. Listbox Methods (Perl in a Nutshell)
  Menu widget: 21.15.2. Menu Methods (Perl in a Nutshell)
  Text widget: 21.11.2. Text Methods (Perl in a Nutshell)
insert index
  Entry widget: 21.8.1. Text Indexes (Perl in a Nutshell)
  Text widget: 21.11.1. Text Indexes and Modifiers (Perl in a Nutshell)
-insertbackground option (widgets): 21.3. Common Widget Configuration Options (Perl in a Nutshell)
-insertborderwidth option (widgets): 21.3. Common Widget Configuration Options (Perl in a Nutshell)
insert_element( ) (HTML::Parser): 20.4.3. HTML::Element (Perl in a Nutshell)
-insertofftime option (widgets): 21.3. Common Widget Configuration Options (Perl in a Nutshell)
-insertontime option (widgets): 21.3. Common Widget Configuration Options (Perl in a Nutshell)
-insertwidth option (widgets): 21.3. Common Widget Configuration Options (Perl in a Nutshell)
inside utility: B.4.3. Finding and Installing Modules (Learning Perl)
install command (CPAN.pm): 2.4.4. Installing Modules with the CPAN Module (Perl in a Nutshell)
installation
  modules, CPAN: 22.2. Using CPAN Modules (Programming Perl)
    into Perl library: 22.2.3. Installing CPAN Modules into the Perl Library (Programming Perl)
  modules supporting: 32.1.17. Module Installation Support (Programming Perl)
installation (of modules)
  alternate library locations: 13.10. Using the Alternate Library Location (Learning Perl Objects, References and Modules)
  alternate locations: 13.6. Alternate Installation Locations (PREFIX=...) (Learning Perl Objects, References and Modules)
  distribution considerations: 13. Writing a Distribution (Learning Perl Objects, References and Modules)
installed modules, inventory of: 32.1.17. Module Installation Support (Programming Perl)
installing
  mod_perl module: 11.2. Installing mod_perl (Perl in a Nutshell)
  modules from CPAN: 12.21.1. Problem (Perl Cookbook)
  Perl documentation: 2.5.1. Installing the Documentation (Perl in a Nutshell)
  Perl modules: 2.4.2. Module Installation (Perl in a Nutshell)
  Perl source code: 2.3. Installing Perl (Perl in a Nutshell)
  signal handlers: 16.15.1. Problem (Perl Cookbook)
instance data: Glossary (Programming Perl)
  circular data structures: 13.13.1. Problem (Perl Cookbook)
  managing: 13.3.1. Problem (Perl Cookbook)
    12.7. Managing Instance Data (Programming Perl)
    generating accesors with autoloading: 12.7.3. Generating Accessors with Autoloading (Programming Perl)
    generating accessors with closures: 12.7.4. Generating Accessors with Closures (Programming Perl)
    generating classes with Class::Struct: 12.7.2. Generating Classes with Class::Struct (Programming Perl)
    new features, Perl 5.6: 12.7.6. New Tricks (Programming Perl)
    using closures for private objects: 12.7.5. Using Closures for Private Objects (Programming Perl)
instance methods: 13.. Methods (Perl Cookbook)
  13.. Some Notes on Object Terminology (Perl Cookbook)
  7.4. Object Syntax (Perl in a Nutshell)
  12.1. Brief Refresher on Object-Oriented Lingo (Programming Perl)
  APIs and: 9.7. Adding Parameters to a Method (Learning Perl Objects, References and Modules)
  class methods and: 9.2. Invoking an Instance Method (Learning Perl Objects, References and Modules)
  invoking: 9.2. Invoking an Instance Method (Learning Perl Objects, References and Modules)
    9.2. Invoking an Instance Method (Learning Perl Objects, References and Modules)
  Math::BigInt module: 12.4. A More Typical Object-Oriented Module: Math::BigInt (Learning Perl Objects, References and Modules)
  object references as invocants for: 12.3. Method Invocation (Programming Perl)
  OO modules and: 12.5. The Differences Between OO and Non-OO Modules (Learning Perl Objects, References and Modules)
  parameters and: 9.7. Adding Parameters to a Method (Learning Perl Objects, References and Modules)
  restricting to: 9.14. Restricting a Method to Class-Only or Instance-Only (Learning Perl Objects, References and Modules)
instance variables: 12.4.2. Initializers (Programming Perl)
  defined: 9.1. A Horse Is a Horse, of Course of Course—or Is It? (Learning Perl Objects, References and Modules)
  filehandles as: 10.1. Nested Object Destruction (Learning Perl Objects, References and Modules)
  hash keys: 9.8. More Interesting Instances (Learning Perl Objects, References and Modules)
  object destruction and: 10. Object Destruction (Learning Perl Objects, References and Modules)
  separate functions, writing for each: 12.7. Managing Instance Data (Programming Perl)
  in subclasses: 10.4. Additional Instance Variables in Subclasses (Learning Perl Objects, References and Modules)
    10.4. Additional Instance Variables in Subclasses (Learning Perl Objects, References and Modules)
instances: 12.1. Brief Refresher on Object-Oriented Lingo (Programming Perl)
  Glossary (Programming Perl)
  accessors and: 11.5. Creating Getters and Setters More Easily (Learning Perl Objects, References and Modules)
  blessed references and: 9.2. Invoking an Instance Method (Learning Perl Objects, References and Modules)
    9.2. Invoking an Instance Method (Learning Perl Objects, References and Modules)
  building: 9.4. How to Build a Horse (Learning Perl Objects, References and Modules)
  defined: 9.1. A Horse Is a Horse, of Course of Course—or Is It? (Learning Perl Objects, References and Modules)
    9.1. A Horse Is a Horse, of Course of Course—or Is It? (Learning Perl Objects, References and Modules)
  hashes and: 9.8. More Interesting Instances (Learning Perl Objects, References and Modules)
  isa method testing: 11.2. Testing Your Objects for Good Behavior (Learning Perl Objects, References and Modules)
  methods working with: 9.6. Making a Method Work with Either Classes or Instances (Learning Perl Objects, References and Modules)
instances of classes: 7.3. Object-Oriented Perl (Perl in a Nutshell)
InstMsi.exe: 2.3.2.1. ActivePerl (Perl in a Nutshell)
int( ): 5. Function Reference (Perl in a Nutshell)
  2.2.3. Discussion (Perl Cookbook)
  a href="../prog/ch29_02.htm#INDEX-4935"> 29.2.76. int
  (Programming Perl)
integer literals: 2.2.3. Integer Literals (Learning Perl)
integer module: 8.125. integer (Perl in a Nutshell)
integer pragma: 2.2.1. All Numbers Are the Same Format Internally (Learning Perl)
integers: 2.4.1. Problem (Perl Cookbook)
  2.2.1. All Numbers Are the Same Format Internally (Learning Perl)
  29.2.76. int (Programming Perl)
  Glossary (Programming Perl)
  computer storage, order of: 25.2. Endianness and Number Width (Programming Perl)
  converting to UTF-8 characters: 15.2. Effects of Character Semantics (Programming Perl)
  exponentiation: 21.4.5. Fiddling with the Perl Stack from C (Programming Perl)
  formats: 29.2.108. pack (Programming Perl)
  formats for: 29.2.162. sprintf (Programming Perl)
  integer truncation: 2.2.3. Discussion (Perl Cookbook)
  IV (internal integer value): Glossary (Programming Perl)
  IV (internal integer values): 21.2. Internal Data Types (Programming Perl)
  IV typedef in C: 21.2. Internal Data Types (Programming Perl)
  Math::BigInt module: 13. Overloading (Programming Perl)
  standard modules for arithmetic with: 32.1.1. Data Types (Programming Perl)
  strings as vectors of: 29.2.195. vec (Programming Perl)
interactivity, testing for: 15.2.1. Problem (Perl Cookbook)
intercept signals, handler for: 16.1. Signals (Programming Perl)
interfaces: 12.1. Brief Refresher on Object-Oriented Lingo (Programming Perl)
  Glossary (Programming Perl)
  byte vs. character semantics in: 15.1. Building Character (Programming Perl)
  distribution considerations: 13. Writing a Distribution (Learning Perl Objects, References and Modules)
  File::Basename module: 12.1. Sample Function-Oriented Interface: File::Basename (Learning Perl Objects, References and Modules)
    12.1. Sample Function-Oriented Interface: File::Basename (Learning Perl Objects, References and Modules)
  File::Spec module: 12.3. Sample Object-Oriented Interface: File::Spec (Learning Perl Objects, References and Modules)
  maintenance considerations: 11.5. Creating Getters and Setters More Easily (Learning Perl Objects, References and Modules)
  version numbers and: 13.3. The Prototype Module Itself (Learning Perl Objects, References and Modules)
interior sequences (pod): 4.13.2. Interior Sequences (Perl in a Nutshell)
internal integers: 2.2.1. All Numbers Are the Same Format Internally (Learning Perl)
internal redirection: 21.4.3. Discussion (Perl Cookbook)
internal variable names, Perl: 2.5. Names (Programming Perl)
internationalization: 2.1. Atoms (Programming Perl)
  25.9. Internationalization (Programming Perl)
  localization, first week of the year: 3.6.3. Discussion (Perl Cookbook)
  modules for: 32.1.6. Internationalization and Locale (Programming Perl)
  Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)
  textual data, with Unicode: 15. Unicode (Programming Perl)
  Unicode: 1.. Unicode Support in Perl (Perl Cookbook)
Internet (see also Web)
  domain sockets: 17.. Introduction (Perl Cookbook)
  protocols: 18.. Introduction (Perl Cookbook)
Internet-domain sockets: 15. Sockets (Perl in a Nutshell)
Internet protocols, Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)
Internet services: 18.. Introduction (Perl Cookbook)
  accessing LDAP server: 18.8.1. Problem (Perl Cookbook)
  DNS lookups: 18.1.1. Problem (Perl Cookbook)
  expn and vrfy programs: 18.16. Program: expn and vrfy (Perl Cookbook)
  FTP client: 18.2.1. Problem (Perl Cookbook)
  mail (see email)
  pinging machines: 18.7.1. Problem (Perl Cookbook)
  remote procedure calls: 18.. Introduction (Perl Cookbook)
  simulating telnet connection: 18.6.1. Problem (Perl Cookbook)
  SOAP client: 18.14.1. Problem (Perl Cookbook)
  SOAP server: 18.13.1. Problem (Perl Cookbook)
  Usenet news: 18.4.1. Problem (Perl Cookbook)
  XML-RPC client: 18.12.1. Problem (Perl Cookbook)
  XML-RPC server: 18.11.1. Problem (Perl Cookbook)
Internet services, CPAN modules for: 16.5. Sockets (Programming Perl)
Internet TCP clients/servers: 16.5.1. Networking Clients (Programming Perl)
interpolating variables
  pattern matching, controlling with: 5.9.2. Variable Interpolation (Programming Perl)
interpolation
  array variables: 2.6.5. Interpolating Array Values (Programming Perl)
  backreference variables: 1.7.4. Backreferences (Programming Perl)
  conditionals into patterns: 5.10.3.5. Conditional interpolation (Programming Perl)
  double-quoted strings: 1.5.2. String Operators (Programming Perl)
  double quotes ("), using: 5.2. Pattern-Matching Operators (Programming Perl)
  functions: 14.2.2. Notational Convenience (Programming Perl)
  glob operator, using for: 2.11.3. Filename Globbing Operator (Programming Perl)
  list: 2.8. List Values and Arrays (Programming Perl)
  match-time pattern interpolation: 5.10.3.4. Match-time pattern interpolation (Programming Perl)
  scalar values: 2.6.2. String Literals (Programming Perl)
    characters into double-quoted strings: 2.6.2. String Literals (Programming Perl)
  variables
    in double-quoted strings: 2.6.2. String Literals (Programming Perl)
    into patterns: 5.2. Pattern-Matching Operators (Programming Perl)
interpolation of variables: 1.2.1.1. Singularities (Programming Perl)
interpolation, variable: Glossary (Programming Perl)
interpolative context: 2.7.4. Interpolative Context (Programming Perl)
interpreter, Perl: 3. The Perl Executable (Perl in a Nutshell)
  18.3. Executing Your Code (Programming Perl)
  18.3. Executing Your Code (Programming Perl)
  Glossary (Programming Perl)
  accessing from C: 21.4. Embedding Perl (Using Perl from C) (Programming Perl)
  adding to C program: 21.4.2. Adding a Perl Interpreter to Your C Program (Programming Perl)
  command-line options: 3.2. Command-Line Options (Perl in a Nutshell)
  command processing: 3.1. Command Processing (Perl in a Nutshell)
  compiler, interaction with: 18.7. Avant-Garde Compiler, Retro Interpreter (Programming Perl)
  embedding in applications: 18.3. Executing Your Code (Programming Perl)
  invoking with #! (shebang) line: 19.1. Command Processing (Programming Perl)
  multiple, running: 18.3. Executing Your Code (Programming Perl)
  persistent: 21.4. Embedding Perl (Using Perl from C) (Programming Perl)
interpreters: 1.2. Natural and Artificial Languages (Programming Perl)
  for commands: 19.1. Command Processing (Programming Perl)
    quoting on Unix systems: 19.1.1. #! and Quoting on Non-Unix Systems (Programming Perl)
  object destruction at shutdown: 12.6.1. Garbage Collection with DESTROY Methods (Programming Perl)
  threads: 17.1. The Process Model (Programming Perl)
interpreters, Perl: 1.3.1. How to Do It (Programming Perl)
interprocess communication: B.13.1. System V IPC (Learning Perl)
  pipes: 16.3. Pipes (Programming Perl)
interprocess communication, functions for: 5.1. Perl Functions by Category (Perl in a Nutshell)
interrupt signals, handler for: 16.1. Signals (Programming Perl)
intersection of sets: 6.3. Passing References (Programming Perl)
intersections on lists: 4.8.1. Problem (Perl Cookbook)
  4.9.1. Problem (Perl Cookbook)
ints: 29.2.108. pack (Programming Perl)
inverse_select( ) (Mail::Folder): 16.2.3. Handle Folders with Mail::Folder (Perl in a Nutshell)
inverting arrays and hashes: 29.2.132. reverse (Programming Perl)
inverting hashes: 5.9.1. Problem (Perl Cookbook)
invocant: 13.. Methods (Perl Cookbook)
  12.3. Method Invocation (Programming Perl)
  Glossary (Programming Perl)
invocation arguments: 6.2. Input from the Diamond Operator (Learning Perl)
  6.3. The Invocation Arguments (Learning Perl)
Catalog( ) (Win32::ODBC module): 24.1. ODBC Methods and Properties (Perl in a Nutshell)
invoking (see executing)
invoking subroutines: 4.3. Invoking a Subroutine (Learning Perl)
I/O (input/output): 6. I/O Basics (Learning Perl)
  6. I/O Basics (Learning Perl)
  4.9.1. Perl 5.8 and PerlIO (Perl in a Nutshell)
  Glossary (Programming Perl)
  filehandles and: 11.1. What Is a Filehandle? (Learning Perl)
IO (internal I/O object): Glossary (Programming Perl)
  Glossary (Programming Perl)
  (see also indirect objects)
I/O layers: 7.. I/O Operations (Perl Cookbook)
  7.19.3. Discussion (Perl Cookbook)
  8.. I/O Layers (Perl Cookbook)
  bytes: 8.. I/O Layers (Perl Cookbook)
  crlf: 8.. I/O Layers (Perl Cookbook)
    8.. I/O Layers (Perl Cookbook)
    8.11.3. Discussion (Perl Cookbook)
  raw: 8.. I/O Layers (Perl Cookbook)
    8.11.3. Discussion (Perl Cookbook)
  reading and writing Unicode from filehandles: 8.20.2. Solution (Perl Cookbook)
  scalars: 8.23.3. Discussion (Perl Cookbook)
  setting default: 8.19.1. Problem (Perl Cookbook)
  stdio: 7.. I/O Operations (Perl Cookbook)
    7.10.3. Discussion (Perl Cookbook)
  unix: 7.. I/O Operations (Perl Cookbook)
    7.19.3. Discussion (Perl Cookbook)
  utf8: 8.. I/O Layers (Perl Cookbook)
IO module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)
IO modules: 8.126. IO (Perl in a Nutshell)
  IO::File module: 8.127. IO::File (Perl in a Nutshell)
  IO::Handle module: 8.128. IO::Handle (Perl in a Nutshell)
  IO::Pipe module: 8.129. IO::Pipe (Perl in a Nutshell)
  IO::Seekable module: 8.130. IO::Seekable (Perl in a Nutshell)
    8.131. IO::Select (Perl in a Nutshell)
  IO::Socket module: 8.132. IO::Socket (Perl in a Nutshell)
I/O operations
  access modes: 7.. I/O Operations (Perl Cookbook)
  buffering: 7.. I/O Operations (Perl Cookbook)
    7.19.3. Discussion (Perl Cookbook)
    8.. Advanced Operations (Perl Cookbook)
    17.3.3. Discussion (Perl Cookbook)
  controlling for other programs: 16.8.1. Problem (Perl Cookbook)
  flushing output: 7.19.1. Problem (Perl Cookbook)
  non-blocking: 7.20.1. Problem (Perl Cookbook)
  preprocessing input: 16.6.1. Problem (Perl Cookbook)
  random-access I/O: 8.12.1. Problem (Perl Cookbook)
  reading and writing to other programs: 16.4.1. Problem (Perl Cookbook)
ioctl( ): 5. Function Reference (Perl in a Nutshell)
  7.21.2. Solution (Perl Cookbook)
  12.17.3. Discussion (Perl Cookbook)
  return values: 10.10.3. Discussion (Perl Cookbook)
  29.2.77. ioctl (Programming Perl)
IO::Dir module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)
IO::File class: 11.7. References to Filehandles (Learning Perl Objects, References and Modules)
  11.7. References to Filehandles (Learning Perl Objects, References and Modules)
IO::File module: 7.. Getting a Handle on the File (Perl Cookbook)
  32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)
IO::Handle module: 7.5.3. Discussion (Perl Cookbook)
  7.9.2. Solution (Perl Cookbook)
  7.23.2. Solution (Perl Cookbook)
  8.5.3. Discussion (Perl Cookbook)
  32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)
IO::modules: 22.1. The CPAN modules Directory (Programming Perl)
IO::Multiplex module: 17.19.2. Solution (Perl Cookbook)
IO::Pipe module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)
IO::Poll module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)
IO::Pty module: 15.13.3. Discussion (Perl Cookbook)
  16.3.3. Bidirectional Communication (Programming Perl)
IO::Seekable module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)
IO::Select module: 7.22.2. Solution (Perl Cookbook)
  16.9.2. Solution (Perl Cookbook)
  16.9.3. Discussion (Perl Cookbook)
  32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)
IO::Socket module: 15.2. The IO::Socket Module (Perl in a Nutshell)
  IO::Socket::INET subclass: 15.2.4. IO::Socket::INET Reference (Perl in a Nutshell)
  IO::Socket::UNIX subclass: 15.2.5. IO::Socket::UNIX Reference (Perl in a Nutshell)
IO::Socket::INET class: 17.1.2. Solution (Perl Cookbook)
IO::Socket::INET module: 16.5.1. Networking Clients (Programming Perl)
  32.1.8. Networking and Interprocess Communication (Programming Perl)
IO::Socket::SSL module: 20.16.3. Discussion (Perl Cookbook)
IO::Socket::UNIX module: 17.6.2. Solution (Perl Cookbook)
  32.1.8. Networking and Interprocess Communication (Programming Perl)
IO::Stty module: 15.13.3. Discussion (Perl Cookbook)
IO::Tee module: 7.8.3. Discussion (Perl Cookbook)
IP addresses
  determining your own: 17.8.1. Problem (Perl Cookbook)
  DNS lookups: 18.1.1. Problem (Perl Cookbook)
  expn and vrfy programs: 18.16. Program: expn and vrfy (Perl Cookbook)
  identifying socket ends: 17.7.1. Problem (Perl Cookbook)
  multihomed servers: 17.16.1. Problem (Perl Cookbook)
  network names and: 29.2.53. getnetent (Programming Perl)
  packed, converting to ASCII strings: 17.. Introduction (Perl Cookbook)
  using v-string notation for: 29.2.47. gethostbyaddr (Programming Perl)
  UTF-8 representation of: 15.1. Building Character (Programming Perl)
IP addresses, hashes and: 5.1.1. Why Use a Hash? (Learning Perl)
IP (Internet Protocol): 16.5. Sockets (Programming Perl)
  Glossary (Programming Perl)
-ipadx, -ipady options
  grid geometry manager: 21.2.2. The grid Geometry Manager (Perl in a Nutshell)
  pack geometry manager: 21.2.1. The pack Geometry Manager (Perl in a Nutshell)
IPC: B.13. Networking and IPC (Learning Perl)
IPC (interprocess communication): 16. Interprocess Communication (Programming Perl)
  between processes on same machine: 16. Interprocess Communication (Programming Perl)
  modules for: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)
    32.1.8. Networking and Interprocess Communication (Programming Perl)
  portability and: 25.5. Interprocess Communication (IPC) (Programming Perl)
  signals: 16.1. Signals (Programming Perl)
IPC modules: 8.133. IPC::Msg (Perl in a Nutshell)
  IPC::Msg module: 8.133. IPC::Msg (Perl in a Nutshell)
  IPC::Open3 module: 8.135. IPC::Open3 (Perl in a Nutshell)
  IPC::Semaphore module: 8.136. IPC::Semaphore (Perl in a Nutshell)
  IPC::SysV module: 8.137. IPC::SysV (Perl in a Nutshell)
IPC::Msg module: 32.1.8. Networking and Interprocess Communication (Programming Perl)
IPC::Open3: 21.4. Embedding Perl (Using Perl from C) (Programming Perl)
IPC::Open2 module: 16.8.2. Solution (Perl Cookbook)
  32.1.8. Networking and Interprocess Communication (Programming Perl)
IPC::Semaphore module: 32.1.8. Networking and Interprocess Communication (Programming Perl)
IPC::Shareable module: 16.12.3. Discussion (Perl Cookbook)
  16.4. System V IPC (Programming Perl)
IPC::SysV module: 32.1.8. Networking and Interprocess Communication (Programming Perl)
irregular files: 1.5.7. Some File Test Operators (Programming Perl)
is-a: Glossary (Programming Perl)
is function (Test::More): 14.3. Writing Tests with Test::More (Learning Perl Objects, References and Modules)
  14.6. Testing Things That Write to STDOUT and STDERR (Learning Perl Objects, References and Modules)
@ISA variable
  features: 8.5. A Few Notes About @ISA (Learning Perl Objects, References and Modules)
    8.5. A Few Notes About @ISA (Learning Perl Objects, References and Modules)
  inheritance hierarchies and: 11.1. UNIVERSAL Methods (Learning Perl Objects, References and Modules)
  multiple inheritance: 11.6. Multiple Inheritance (Learning Perl Objects, References and Modules)
isa( ): 13.9.3. Discussion (Perl Cookbook)
@ISA array: 12.5. Class Inheritance (Programming Perl)
  28.2. Special Variables in Alphabetical Order (Programming Perl)
  inheritance through: 12.5.1. Inheritance Through @ISA (Programming Perl)
  use base pragma and: 31.3. use base (Programming Perl)
isa method: 12.5.3. UNIVERSAL: The Ultimate Ancestor Class (Programming Perl)
isa method (UNIVERSAL): 11.2. Testing Your Objects for Good Behavior (Learning Perl Objects, References and Modules)
  11.2. Testing Your Objects for Good Behavior (Learning Perl Objects, References and Modules)
isany method (XML::Parser::ContentModel): 13.6. XML::Parser::ContentModel Methods (Perl in a Nutshell)
isa_ok function (Test::More): 14.3. Writing Tests with Test::More (Learning Perl Objects, References and Modules)
ischoice method (XML::Parser::ContentModel): 13.6. XML::Parser::ContentModel Methods (Perl in a Nutshell)
is_client_error( ) (HTTP::Status: 20.3.4. HTTP::Status (Perl in a Nutshell)
is_empty( ) (HTML::Parser): 20.4.3. HTML::Element (Perl in a Nutshell)
isempty method (XML::Parser::ContentModel): 13.6. XML::Parser::ContentModel Methods (Perl in a Nutshell)
is_error( )
  HTTP::Response module: 20.3.2. HTTP::Response (Perl in a Nutshell)
  HTTP::Status module: 20.3.4. HTTP::Status (Perl in a Nutshell)
  LWP::Simple module: 20.2.2. LWP::Simple (Perl in a Nutshell)
is_fresh( ) (HTTP::Response): 20.3.2. HTTP::Response (Perl in a Nutshell)
  20.3.2. HTTP::Response
(Perl in a Nutshell)

isindex( ) (CGI.pm): 10.7. CGI.pm Reference (Perl in a Nutshell)
is_info( )
  HTTP::Response module: 20.3.2. HTTP::Response (Perl in a Nutshell)
  HTTP::Status module: 20.3.4. HTTP::Status (Perl in a Nutshell)
is_inside( ) (HTML::Parser): 20.4.3. HTML::Element (Perl in a Nutshell)
ismixed method (XML::Parser::ContentModel): 13.6. XML::Parser::ContentModel Methods (Perl in a Nutshell)
isname method (XML::Parser::ContentModel): 13.6. XML::Parser::ContentModel Methods (Perl in a Nutshell)
isnt function (Test::More): 14.3. Writing Tests with Test::More (Learning Perl Objects, References and Modules)
is_numeric( ): 2.1.3. Discussion (Perl Cookbook)
is_protocol_supported( ) (LWP::UserAgent): 20.2.3. LWP::UserAgent (Perl in a Nutshell)
is_readonly( ) (Mail::Folder): 16.2.3. Handle Folders with Mail::Folder (Perl in a Nutshell)
is_redirect( )
  HTTP::Response module: 20.3.2. HTTP::Response (Perl in a Nutshell)
  HTTP::Status module: 20.3.4. HTTP::Status (Perl in a Nutshell)
is_safe( ): 8.17.3. Discussion (Perl Cookbook)
isseq method (XML::Parser::ContentModel): 13.6. XML::Parser::ContentModel Methods (Perl in a Nutshell)
is_server_error( ) (HTTP::Status: 20.3.4. HTTP::Status (Perl in a Nutshell)
is_success( )
  HTTP::Response module: 20.3.2. HTTP::Response (Perl in a Nutshell)
  HTTP::Status module: 20.3.4. HTTP::Status (Perl in a Nutshell)
  LWP::Simple module: 20.2.2. LWP::Simple (Perl in a Nutshell)
=item command (pod): 4.13.1. Paragraph Tags (Perl in a Nutshell)
item tags (Canvas widgets): 21.12.2. Item Tags and IDs (Perl in a Nutshell)
Item( ) (Win32::OLE::Enum): 23.3. Win32::OLE::Enum (Perl in a Nutshell)
itemcget( ) (Canvas): 21.12.3. Canvas Methods (Perl in a Nutshell)
itemconfigure( ) (Canvas): 21.12.3. Canvas Methods (Perl in a Nutshell)
iteration: 4.4.4. Loop Control (Programming Perl)
  Glossary (Programming Perl)
  Glossary (Programming Perl)
  (see also loops)
iteration versus recursion: 7.5. Recursively Defined Data (Learning Perl Objects, References and Modules)
iterations, next and redo operators for: 10.8.2. The next Operator (Learning Perl)
iterative operator, overloading: 13.3. Overloadable Operators (Programming Perl)
iterative statements: 1.6.2. Iterative (Looping) Constructs (Programming Perl)
  for loops: 1.6.2.2. The for statement (Programming Perl)
  foreach statement: 1.6.2.3. The foreach statement (Programming Perl)
  until statements: 1.6.2.1. The while and until statements (Programming Perl)
  while loops: 1.6.2.1. The while and until statements (Programming Perl)
iterator variables: 4.5.3. Discussion (Perl Cookbook)
ithreads: 17.1. The Process Model (Programming Perl)
  Perl API to: 18.3. Executing Your Code (Programming Perl)
itimer routines: 29.2.3. alarm (Programming Perl)
IV (internal integer value): 21.2. Internal Data Types (Programming Perl)
  Glossary (Programming Perl)

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