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Index: I

• -i (in-place editing) command-line switch: Switches
• -I (include path) command-line switch: Switches
• /i pattern modifier: Pattern Modifiers
• • The m// Operator (Matching)
  • The s/// Operator (Substitution)
• identifiers: Molecules
• • Names
  • getpwuid
  • bare, barewords vs.: Or Leave the Quotes Out Entirely
  • effective UID or GID, setting back to real: Accessing Commands and Files Under Reduced Privileges
  • effective user or group IDs, differing from real: Handling Insecure Data
  • enclosing in braces: String Literals
  • line-oriented quoting: "Here" Documents
  • names vs.: Names
  • Perl modules: Using Modules
  • PIDs, guessing: Temporary Files
  • process group ID: Signaling Process Groups
  • processes (pid): open
  • semaphores: semget
  • shared memory segments: shmget
  • single quotes (') in: String Literals
  • starting with underscore (_), changes in Perl versions: Previous Perl Traps
  • thread IDs: Identifying threads
  • Unicode alphanumeric characters, containing: Effects of Character Semantics
• identifiers, package: Packages
• • in package symbol table: Packages
• ideographic unary operators: Ideographic Unary Operators
• ideographs: Regular Expressions
• • matching with \w: Effects of Character Semantics
• idioms, Perl: Fluent Perl
• if modifier: Simple Statements
• if statements: Logical Operators
• • The if and unless statements
  • if and unless Statements
  • C language, differences from Perl: Traps
  • in case structure: Case Structures
  • logical operators and: Logical Operators
• IGNORE pseudosignal: Signals
• imperative developing style: Programmatic Patterns
• implicit method invocation: Method Invocation
• implicit referencing or dereferencing: What Is a Reference?
• import function: Using Modules
• • Exporting without using Exporter's import method
  • import
• • overloading constants: Overloading Constants
• importing: Global Declarations
• • semantics into package: use
  • subroutines from another module: Syntax
  • symbols from one package to another: Symbol Tables
• importing symbols: Module Privacy and the Exporter
• • (see also Exporter module; exporting symbols)
• in interprocess communication
• • bidirectional communication: Bidirectional Communication
• @INC array;prepending directories to: Switches
• %INC hash: Using Modules
• • Special Variables in Alphabetical Order
• I18N::Collate module: Internationalization and Locale
• incrementing variables: Unary Arithmetic Operators
• index function: index
• indexing arrays: Access and Printing of a Hash of Arrays
• indirect filehandles: open
• indirect object slot: Method Invocation Using Indirect Objects
• indirect object syntax: Method Invocation Using Indirect Objects
• • ambiguities in: Syntactic Snafus with Indirect Objects
• • explicit path, passing in slot: Handling Insecure Data
• indirection: Name Lookups
• • References
  • (see also hard references; symbolic references)
  • between class use and implementation: Method Invocation
• inequality (see equality operators[semi] relational operators)
• inet_ntoa function: gethostbyaddr
• infinite loops: for Loops
• infix dereference operator (see arrow operator)
• infix operators: Operators
• inheritance: Brief Refresher on Object-Oriented Lingo
• • base class, establishing at compile time: Perl Language Extensions and Internals
  • class: Packages
  • • Class Inheritance
    • single or multiple: Class Inheritance
  • class accessors: Managing Class Data
  • classes and objects
  • • pseudohash implementation and: Field Declarations with use fields
  • constructors: Inheritable Constructors
  • through @ISA array: Inheritance Through @ISA
  • modules, from Exporter class: Module Privacy and the Exporter
  • overloading and: Inheritance and Overloading
  • restricted access and: Using Closures for Private Objects
• inhibit_exit option (debugger): Debugger Options
• INIT blocks: The Life Cycle of a Perl Program
• • initializing variables before calling subroutine: Scoping Issues
  • order of running: Avant-Garde Compiler, Retro Interpreter
  • • Avant-Garde Compiler, Retro Interpreter
• init program: getppid
• initial caps (see capitalization)
• initialization debugger, customizing with init files: Customizing with Init Files
• initialization expressions: for Loops
• initializing
• • arrays and hash slices: Multiplicative Operators
  • hash variables: Hashes
  • objects: Initializers
  • variables before calling subroutines: Scoping Issues
• inlining constant functions: Inlining Constant Functions
• • preventing inlining: Inlining Constant Functions
• $ino file statistic: stat
• inplace editing ($^I, $INPLACE_EDIT): Switches
• inplace edits with $^I: Special Variables in Alphabetical Order
• $INPLACE_EDIT: Special Variables in Alphabetical Order
• input: fileno
• • (see also STDIN filehandle)
  • checking file descriptors for: select (ready file descriptors)
  • debugger, setting: Unattended Execution
  • files, locating end with eof: Switches
  • files, open mode for: open
  • functions dealing with: Perl Functions by Category
  • ioctl function: ioctl
  • operators: Input Operators
  • pipes: Pipes
  • • Pipes
    • bidirectional: Bidirectional Communication
    • multistage pipelines: Anonymous Pipes
    • tridirectional: Bidirectional Communication
  • record separator (see $/ variable)
  • single-character, buffered and unbuffered: getc
  • XSUBs: XSUB Input and Output
• input filehandles: Filehandles
• $INPUT_LINE_NUMBER: Special Variables in Alphabetical Order
• $INPUT_RECORD_SEPARATOR: Special Variables in Alphabetical Order
• insecure dependency errors: Handling Insecure Data
• installation
• • modules, CPAN: Using CPAN Modules
  • • into Perl library: Installing CPAN Modules into the Perl Library
  • modules supporting: Module Installation Support
• installed modules, inventory of: Module Installation Support
• • managing: Managing Instance Data
  • • generating accesors with autoloading: Generating Accessors with Autoloading
    • generating accessors with closures: Generating Accessors with Closures
    • generating classes with Class::Struct: Generating Classes with Class::Struct
    • new features, Perl 5.6: New Tricks
    • using closures for private objects: Using Closures for Private Objects
• instance methods: Brief Refresher on Object-Oriented Lingo
• • object references as invocants for: Method Invocation
• instance variables: Initializers
• • separate functions, writing for each: Managing Instance Data
• instances: Brief Refresher on Object-Oriented Lingo
• int function: int
• integers: int
• • computer storage, order of: Endianness and Number Width
  • converting to UTF-8 characters: Effects of Character Semantics
  • exponentiation: Fiddling with the Perl Stack from C
  • formats: pack
  • formats for: sprintf
  • IV (internal integer values): Internal Data Types
  • IV typedef in C: Internal Data Types
  • Math::BigInt module: Overloading
  • standard modules for arithmetic with: Data Types
  • strings as vectors of: vec
• intercept signals, handler for: Signals
• interfaces: Brief Refresher on Object-Oriented Lingo
• • byte vs. character semantics in: Building Character
• internal variable names, Perl: Names
• internationalization: Atoms
• • Internationalization
  • modules for: Internationalization and Locale
  • Perl modules for: The CPAN modules Directory
  • textual data, with Unicode: Unicode
• Internet protocols, Perl modules for: The CPAN modules Directory
• Internet services, CPAN modules for: Sockets
• Internet TCP clients/servers: Networking Clients
• interpolation
• • array variables: Interpolating Array Values
  • backreference variables: Backreferences
  • conditionals into patterns: Conditional interpolation
  • double-quoted strings: String Operators
  • double quotes ("), using: Pattern-Matching Operators
  • functions: Notational Convenience
  • glob operator, using for: Filename Globbing Operator
  • list: List Values and Arrays
  • match-time pattern interpolation: Match-time pattern interpolation
  • scalar values: String Literals
  • • characters into double-quoted strings: String Literals
  • variables: Singularities
  • • controlling with pattern matching: Variable Interpolation
    • in double-quoted strings: String Literals
    • into patterns: Pattern-Matching Operators
• interpolative context: Interpolative Context
• interpreter, Perl: Executing Your Code
• • Executing Your Code
  • accessing from C: Embedding Perl (Using Perl from C)
  • adding to C program: Adding a Perl Interpreter to Your C Program
  • compiler, interaction with: Avant-Garde Compiler, Retro Interpreter
  • embedding in applications: Executing Your Code
  • invoking with #! (shebang) line: Command Processing
  • multiple, running: Executing Your Code
  • persistent: Embedding Perl (Using Perl from C)
• interpreters: Natural and Artificial Languages
• • for commands: Command Processing
  • • Perl: How to Do It
    • quoting on Unix systems: #! and Quoting on Non-Unix Systems
  • object destruction at shutdown: Garbage Collection with DESTROY Methods
  • threads: The Process Model
• interprocess communication
• • pipes: Pipes
• interrupt signals, handler for: Signals
• intersection of sets: Passing References
• ints: pack
• inverting arrays and hashes: reverse
• invocant: Method Invocation
• invoking (see executing)
• • (see also indirect objects)
• IO module: Filehandle, Directory Handle, and Stream I/O Utilities
• ioctl function: ioctl
• IO::Dir module: Filehandle, Directory Handle, and Stream I/O Utilities
• IO::File module: Filehandle, Directory Handle, and Stream I/O Utilities
• IO::Handle module: Filehandle, Directory Handle, and Stream I/O Utilities
• IO::modules: The CPAN modules Directory
• IO::Pipe module: Filehandle, Directory Handle, and Stream I/O Utilities
• IO::Poll module: Filehandle, Directory Handle, and Stream I/O Utilities
• IO::Pty module: Bidirectional Communication
• IO::Seekable module: Filehandle, Directory Handle, and Stream I/O Utilities
• IO::Select module: Filehandle, Directory Handle, and Stream I/O Utilities
• IO::Socket module: Sockets
• • Networking and Interprocess Communication
• IO::Socket::INET module: Networking Clients
• • Networking and Interprocess Communication
• IO::Socket::UNIX module: Networking and Interprocess Communication
• IP addresses
• • network names and: getnetent
  • using v-string notation for: gethostbyaddr
  • UTF-8 representation of: Building Character
• IP (Internet Protocol): Sockets
• IPC (interprocess communication): Interprocess Communication
• • between processes on same machine: Interprocess Communication
  • modules for: Filehandle, Directory Handle, and Stream I/O Utilities
  • • Networking and Interprocess Communication
  • portability and: Interprocess Communication (IPC)
  • signals: Signals
• IPC::Msg module: Networking and Interprocess Communication
• IPC::Open3: Embedding Perl (Using Perl from C)
• IPC::Open3 module: Networking and Interprocess Communication
• IPC::Semaphore module: Networking and Interprocess Communication
• IPC::Shareable module: System V IPC
• IPC::SysV module: Networking and Interprocess Communication
• irregular files: Some File Test Operators
• @ISA array: Class Inheritance
• • Special Variables in Alphabetical Order
  • inheritance through: Inheritance Through @ISA
  • use base pragma and: use base
• isa method: UNIVERSAL: The Ultimate Ancestor Class
• iteration: Loop Control
• • (see also loops)
• iterative operator, overloading: Overloadable Operators
• iterative statements: Iterative (Looping) Constructs
• • for loops: The for statement
  • foreach statement: The foreach statement
  • until statements: The while and until statements
  • while loops: The while and until statements
• ithreads: The Process Model
• • Perl API to: Executing Your Code
• itimer routines: alarm
• IV (internal integer value): Internal Data Types

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