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Index: I

-i (in-place editing) command-line switch: 19.1.3. Switches

-I (include path) command-line switch: 19.1.3. Switches

/i pattern modifier: 5.2.1. Pattern Modifiers

5.2.2. The m// Operator (Matching)

5.2.3. The s/// Operator (Substitution)

identifiers: 2.2. Molecules

2.5. Names

29.2.63. getpwuid

bare, barewords vs.: 2.6.4. Or Leave the Quotes Out Entirely

effective UID or GID, setting back to real: 23.1.3. Accessing Commands and Files Under Reduced Privileges

effective user or group IDs, differing from real: 23.1. Handling Insecure Data

enclosing in braces: 2.6.2. String Literals

line-oriented quoting: 2.6.6. "Here" Documents

names vs.: 2.5. Names

Perl modules: 11.1. Using Modules

PIDs, guessing: 23.2.3. Temporary Files

process group ID: 16.1.1. Signaling Process Groups

processes (pid): 29.2.104. open

semaphores: 29.2.143. semget

shared memory segments: 29.2.151. shmget

single quotes (') in: 2.6.2. String Literals

starting with underscore (_), changes in Perl versions: 24.1.5. Previous Perl Traps

thread IDs: 17.2.1.5. Identifying threads

Unicode alphanumeric characters, containing: 15.2. Effects of Character Semantics

identifiers, package: 10. Packages

in package symbol table: 10. Packages

ideographic unary operators: 3.5. Ideographic Unary Operators

ideographs: 1.7. Regular Expressions

matching with \w: 15.2. Effects of Character Semantics

idioms, Perl: 24.4. Fluent Perl

if modifier: 4.1. Simple Statements

if statements: 1.5.5. Logical Operators

1.6.1.1. The if and unless statements

4.3. if and unless Statements

C language, differences from Perl: 24.1.3. C Traps

in case structure: 4.5.1. Case Structures

logical operators and: 1.5.5. Logical Operators

IGNORE pseudosignal: 16.1. Signals

imperative programming style: 5.10.3. Programmatic Patterns

implicit method invocation: 12.3. Method Invocation

implicit referencing or dereferencing: 8.1. What Is a Reference?

import function: 11.1. Using Modules

11.2.1.1. Exporting without using Exporter's import method

29.2.74. import

overloading constants: 13.6. Overloading Constants

importing: 4.7. Global Declarations

semantics into package: 29.2.192. use

subroutines from another module: 6.1. Syntax

symbols from one package to another: 10.1. Symbol Tables

importing symbols: 11.2.1. Module Privacy and the Exporter

(see also Exporter module; exporting symbols)

in interprocess communication

bidirectional communication: 16.3.3. Bidirectional Communication

@INC array;prepending directories to: 19.1.3. Switches

%INC hash: 11.1. Using Modules

28.2. Special Variables in Alphabetical Order

I18N::Collate module: 32.1.6. Internationalization and Locale

incrementing variables: 1.5.4. Unary Arithmetic Operators

index function: 29.2.75. index

indexing arrays: 9.2.3. Access and Printing of a Hash of Arrays

indirect filehandles: 29.2.104. open

indirect object slot: 12.3.2. Method Invocation Using Indirect Objects

indirect object syntax: 12.3.2. Method Invocation Using Indirect Objects

ambiguities in: 12.3.3. Syntactic Snafus with Indirect Objects

explicit path, passing in slot: 23.1. Handling Insecure Data

indirection: 2.5.1. Name Lookups

8. References

(see also hard references; symbolic references)

between class use and implementation: 12.3. Method Invocation

inequality (see equality operators[semi] relational operators)

inet_ntoa function: 29.2.47. gethostbyaddr

infinite loops: 4.4.2. for Loops

infix dereference operator (see arrow operator)

infix operators: 1.5. Operators

inheritance: 12.1. Brief Refresher on Object-Oriented Lingo

base class, establishing at compile time: 32.1.13. Perl Language Extensions and Internals

class: 10. Packages

12.5. Class Inheritance

single or multiple: 12.5. Class Inheritance

class accessors: 12.8. Managing Class Data

classes and objects

pseudohash implementation and: 12.7.1. Field Declarations with use fields

constructors: 12.4.1. Inheritable Constructors

through @ISA array: 12.5.1. Inheritance Through @ISA

modules, from Exporter class: 11.2.1. Module Privacy and the Exporter

overloading and: 13.8. Inheritance and Overloading

restricted access and: 12.7.5. Using Closures for Private Objects

inhibit_exit option (debugger): 20.3.3. Debugger Options

INIT blocks: 18.1. The Life Cycle of a Perl Program

initializing variables before calling subroutine: 6.2.3. Scoping Issues

order of running: 18.7. Avant-Garde Compiler, Retro Interpreter

18.7. Avant-Garde Compiler, Retro Interpreter

init program: 29.2.56. getppid

initial caps (see capitalization)

initialization debugger, customizing with init files: 20.3.2. Customizing with Init Files

initialization expressions: 4.4.2. for Loops

initializing

arrays and hash slices: 3.7. Multiplicative Operators

hash variables: 2.9. Hashes

objects: 12.4.2. Initializers

variables before calling subroutines: 6.2.3. Scoping Issues

inlining constant functions: 6.4.1. Inlining Constant Functions

preventing inlining: 6.4.1. Inlining Constant Functions

$ino file statistic: 29.2.165. stat

inplace editing ($^I, $INPLACE_EDIT): 19.1.3. Switches

inplace edits with $^I: 28.2. Special Variables in Alphabetical Order

$INPLACE_EDIT: 28.2. Special Variables in Alphabetical Order

input: 29.2.38. fileno

(see also STDIN filehandle)

checking file descriptors for: 29.2.141. select (ready file descriptors)

debugger, setting: 20.4. Unattended Execution

files, locating end with eof: 19.1.3. Switches

files, open mode for: 29.2.104. open

functions dealing with: 29.1. Perl Functions by Category

ioctl function: 29.2.77. ioctl

operators: 2.11. Input Operators

pipes: 16.3. Pipes

16.3. Pipes

bidirectional: 16.3.3. Bidirectional Communication

multistage pipelines: 16.3.1. Anonymous Pipes

tridirectional: 16.3.3. Bidirectional Communication

record separator (see $/ variable)

single-character, buffered and unbuffered: 29.2.43. getc

XSUBs: 21.3.3. XSUB Input and Output

input filehandles: 1.4. Filehandles

$INPUT_LINE_NUMBER: 28.2. Special Variables in Alphabetical Order

$INPUT_RECORD_SEPARATOR: 28.2. Special Variables in Alphabetical Order

insecure dependency errors: 23.1. Handling Insecure Data

installation

modules, CPAN: 22.2. Using CPAN Modules

into Perl library: 22.2.3. Installing CPAN Modules into the Perl Library

modules supporting: 32.1.17. Module Installation Support

installed modules, inventory of: 32.1.17. Module Installation Support

managing: 12.7. Managing Instance Data

generating accesors with autoloading: 12.7.3. Generating Accessors with Autoloading

generating accessors with closures: 12.7.4. Generating Accessors with Closures

generating classes with Class::Struct: 12.7.2. Generating Classes with Class::Struct

new features, Perl 5.6: 12.7.6. New Tricks

using closures for private objects: 12.7.5. Using Closures for Private Objects

instance methods: 12.1. Brief Refresher on Object-Oriented Lingo

object references as invocants for: 12.3. Method Invocation

instance variables: 12.4.2. Initializers

separate functions, writing for each: 12.7. Managing Instance Data

instances: 12.1. Brief Refresher on Object-Oriented Lingo

int function: 29.2.76. int

integers: 29.2.76. int

computer storage, order of: 25.2. Endianness and Number Width

converting to UTF-8 characters: 15.2. Effects of Character Semantics

exponentiation: 21.4.5. Fiddling with the Perl Stack from C

formats: 29.2.108. pack

formats for: 29.2.162. sprintf

IV (internal integer values): 21.2. Internal Data Types

IV typedef in C: 21.2. Internal Data Types

Math::BigInt module: 13. Overloading

standard modules for arithmetic with: 32.1.1. Data Types

strings as vectors of: 29.2.195. vec

intercept signals, handler for: 16.1. Signals

interfaces: 12.1. Brief Refresher on Object-Oriented Lingo

byte vs. character semantics in: 15.1. Building Character

internal variable names, Perl: 2.5. Names

internationalization: 2.1. Atoms

25.9. Internationalization

modules for: 32.1.6. Internationalization and Locale

Perl modules for: 22.1. The CPAN modules Directory

textual data, with Unicode: 15. Unicode

Internet protocols, Perl modules for: 22.1. The CPAN modules Directory

Internet services, CPAN modules for: 16.5. Sockets

Internet TCP clients/servers: 16.5.1. Networking Clients

interpolation

array variables: 2.6.5. Interpolating Array Values

backreference variables: 1.7.4. Backreferences

conditionals into patterns: 5.10.3.5. Conditional interpolation

double-quoted strings: 1.5.2. String Operators

double quotes ("), using: 5.2. Pattern-Matching Operators

functions: 14.2.2. Notational Convenience

glob operator, using for: 2.11.3. Filename Globbing Operator

list: 2.8. List Values and Arrays

match-time pattern interpolation: 5.10.3.4. Match-time pattern interpolation

scalar values: 2.6.2. String Literals

characters into double-quoted strings: 2.6.2. String Literals

variables: 1.2.1.1. Singularities

controlling with pattern matching: 5.9.2. Variable Interpolation

in double-quoted strings: 2.6.2. String Literals

into patterns: 5.2. Pattern-Matching Operators

interpolative context: 2.7.4. Interpolative Context

interpreter, Perl: 18.3. Executing Your Code

18.3. Executing Your Code

accessing from C: 21.4. Embedding Perl (Using Perl from C)

adding to C program: 21.4.2. Adding a Perl Interpreter to Your C Program

compiler, interaction with: 18.7. Avant-Garde Compiler, Retro Interpreter

embedding in applications: 18.3. Executing Your Code

invoking with #! (shebang) line: 19.1. Command Processing

multiple, running: 18.3. Executing Your Code

persistent: 21.4. Embedding Perl (Using Perl from C)

interpreters: 1.2. Natural and Artificial Languages

for commands: 19.1. Command Processing

Perl: 1.3.1. How to Do It

quoting on Unix systems: 19.1.1. #! and Quoting on Non-Unix Systems

object destruction at shutdown: 12.6.1. Garbage Collection with DESTROY Methods

threads: 17.1. The Process Model

interprocess communication

pipes: 16.3. Pipes

interrupt signals, handler for: 16.1. Signals

intersection of sets: 6.3. Passing References

ints: 29.2.108. pack

inverting arrays and hashes: 29.2.132. reverse

invocant: 12.3. Method Invocation

invoking (see executing)

(see also indirect objects)

IO module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

ioctl function: 29.2.77. ioctl

IO::Dir module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

IO::File module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

IO::Handle module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

IO::modules: 22.1. The CPAN modules Directory

IO::Pipe module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

IO::Poll module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

IO::Pty module: 16.3.3. Bidirectional Communication

IO::Seekable module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

IO::Select module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

IO::Socket module: 16.5. Sockets

32.1.8. Networking and Interprocess Communication

IO::Socket::INET module: 16.5.1. Networking Clients

32.1.8. Networking and Interprocess Communication

IO::Socket::UNIX module: 32.1.8. Networking and Interprocess Communication

IP addresses

network names and: 29.2.53. getnetent

using v-string notation for: 29.2.47. gethostbyaddr

UTF-8 representation of: 15.1. Building Character

IP (Internet Protocol): 16.5. Sockets

IPC (interprocess communication): 16. Interprocess Communication

between processes on same machine: 16. Interprocess Communication

modules for: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

32.1.8. Networking and Interprocess Communication

portability and: 25.5. Interprocess Communication (IPC)

signals: 16.1. Signals

IPC::Msg module: 32.1.8. Networking and Interprocess Communication

IPC::Open3: 21.4. Embedding Perl (Using Perl from C)

IPC::Open3 module: 32.1.8. Networking and Interprocess Communication

IPC::Semaphore module: 32.1.8. Networking and Interprocess Communication

IPC::Shareable module: 16.4. System V IPC

IPC::SysV module: 32.1.8. Networking and Interprocess Communication

irregular files: 1.5.7. Some File Test Operators

@ISA array: 12.5. Class Inheritance

28.2. Special Variables in Alphabetical Order

inheritance through: 12.5.1. Inheritance Through @ISA

use base pragma and: 31.3. use base

isa method: 12.5.3. UNIVERSAL: The Ultimate Ancestor Class

iteration: 4.4.4. Loop Control

(see also loops)

iterative operator, overloading: 13.3. Overloadable Operators

iterative statements: 1.6.2. Iterative (Looping) Constructs

for loops: 1.6.2.2. The for statement

foreach statement: 1.6.2.3. The foreach statement

until statements: 1.6.2.1. The while and until statements

while loops: 1.6.2.1. The while and until statements

ithreads: 17.1. The Process Model

Perl API to: 18.3. Executing Your Code

itimer routines: 29.2.3. alarm

IV (internal integer value): 21.2. Internal Data Types

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