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Index: O

• -o (effective UID) file test: Named Unary and File Test Operators
• /o modifier, recompilation, suppressing with: Variable Interpolation
• O module: Compiler Backends
• • Code Development Tools
  • Perl Compiler and Code Generator
• /o pattern modifier: Pattern Modifiers
• • Pattern Modifiers
  • The m// Operator (Matching)
  • The s/// Operator (Substitution)
• -O (real UID) file test: Named Unary and File Test Operators
• object classes: Packages
• object methods: Using Object Methods
• • locking: Locking methods
  • Thread objects: The Thread Module
• object-oriented modules: Using Modules
• • method calls, allowing: Creating Modules
• object-oriented developing: Packages
• • Brief Refresher on Object-Oriented Lingo
  • abstraction in: Method Invocation
  • modules for file, directory, and IPC access: Filehandle, Directory Handle, and Stream I/O Utilities
  • Perl modules for: The CPAN modules Directory
  • portable filename operations: Filenames, Filesystems, and File Locking
  • references in Perl, emulating: Packages
• objects: Complexities
• • Objects
  • blessing: The Arrow Operator
  • • bless
  • class data, managing: Managing Class Data
  • constructors: Object Constructors
  • • Object Construction
    • inheritable: Inheritable Constructors
    • initializers: Initializers
  • destruction of (global), controlling: Environment Variables
  • functions dealing with: Perl Functions by Category
  • indirect (see indirect objects)
  • inheritance, through @ISA array: Inheritance Through @ISA
  • instance data, managing: Managing Instance Data
  • • Field Declarations with use fields
    • generating accesors with closures: Generating Accessors with Closures
    • generating accessors with autoloading: Generating Accessors with Autoloading
    • generating classes with Class::Struct: Generating Classes with Class::Struct
    • new features, Perl 5.6: New Tricks
    • private objects, using closures for: Using Closures for Private Objects
  • instance destructors: Instance Destructors
  • • garbage collection with: Garbage Collection with DESTROY Methods
  • methods, references to: Closures
  • • Closures
    • (see also closures)
  • Perl object system: Perl's Object System
  • references to, in scalars: Singularities
  • storing within other objects vs. inheritance: Instance Destructors
  • stringifying: Other Tricks You Can Do with Hard References
  • tied variables, underlying: Tied Variables
  • • breaking reference to: Subtle Untying Trap
• oct function: Numeric Literals
• • oct
• octal characters: Numeric Literals
• octal numbers: oct
• • characters, representing: Building Character
  • characters, specifying with: Specific Characters
  • specifying $/ as: Switches
• octets (see bytes)
• • for m// successes: pos
  • read function and: read
  • seek function: seek
• OLE, Perl modules for: The CPAN modules Directory
• one-liners: How to Do It
• OOP (see object-oriented developing)
• Opcode module: Authentication, Security, and Encryption
• opcodes: Compiling Your Code
• • Executing Your Code
  • How Perl Works
• open function: Filehandles
• • Anonymous Pipes
  • open
  • converting file descriptor to filehandle: Passing Filehandles
  • $. and: close
  • fileno function and: fileno
  • fork-open: open
  • forking open: Talking to Yourself
  • modes in three-argument form: open
  • piped, list argument form, avoiding shell with: Code Masquerading as Data
  • piped (two-argument form): open
  • for pipes, security risks posed by: Cleaning Up Your Environment
  • pipes, opening with: Anonymous Pipes
  • portability of: Interprocess Communication (IPC)
• Open2, Open3 library modules: Bidirectional Communication
• opendir function: opendir
• opening
• • files via low-level system call: sysopen
  • sockets: socket
• operand stack: Executing Your Code
• operating system name: Special Variables in Alphabetical Order
• • The Pursuit of Happiness
  • #! technique, simulating on non-Unix systems: #! and Quoting on Non-Unix Systems
  • command interpreters for: Command Processing
  • flock support on: File Locking
  • fork operator, support for: Passing Filehandles
  • GUIs, relying on: System Interaction
  • interfaces to, manipulating: Operating System Interfaces
  • invoking interpreters with #! line: Command Processing
  • module names, translating to directory names: Using Modules
  • newlines, variations in: Newlines
  • perl interpreter, starting on: How to Do It
  • Perl modules for: The CPAN modules Directory
  • Perl ports to: CPAN
  • Perl program portability: Portable Perl
  • signal reliability on: Reaping Zombies
  • signals and default behaviors of: Signals
  • sockets, support for: Sockets
  • threading libraries: The Thread Model
• operations, contexts, evaluation in: Scalar and List Context
• operators: Operators
• • Unary and Binary Operators
  • access, restricting with Safe module: Restricting operator access
  • assignment operators: Assignment Operators
  • associativity of: Unary and Binary Operators
  • C language, missing in Perl: Operators Missing from Perl
  • for loop control: Loop Control
  • logical operators: Logical Operators
  • matching and substitution: Pattern Matching
  • overloadable: Overloadable Operators
  • • arithmetic operators: Overloadable Operators
    • assignment operators: Overloadable Operators
    • bitwise operators: Overloadable Operators
    • circular references, problems with: Overloadable Operators
    • comparison operators: Overloadable Operators
    • conversion operators: Overloadable Operators
    • dereference operators: Overloadable Operators
    • iterative operator: Overloadable Operators
    • logical negation operator: Overloadable Operators
  • overloading: Unary and Binary Operators
  • • Overloading
    • Data Types
  • pattern-matching: Pattern-Matching Operators
  • • modifiers for: Pattern Modifiers
  • positions or lengths, switching to character positions: Effects of Character Semantics
  • precedence of: Some Binary Arithmetic Operators
  • • Unary and Binary Operators
    • C precedence, retaining in Perl: Unary and Binary Operators
  • quotes, syntactical similarity to: Singularities
  • quoting operators: Pick Your Own Quotes
  • scalar context, supplying to parameters: Singularities
  • string operators: String Operators
  • verbs as: Verbs
• ops module: Authentication, Security, and Encryption
• optimizing
• • in the Perl compiler: Compiling Your Code
  • performance and: Efficiency
• option processing, Perl modules for: Option, Argument, Parameter, and Configuration File Processing
• • The CPAN modules Directory
• options (see switches, command-line)
• • Switches
• OR (||) operator: C-Style Logical (Short-Circuit) Operators
• • list operators and: Global Declarations
• OR logical operator: Logical Operators
• Or operator: Logical Operators
• ord function: Effects of Character Semantics
• • ord
• order (see precedence)
• • of function precedence: Functions
• ornaments option (debugger): Debugger Options
• OS/2 operating system, invoking Perl applications on: #! and Quoting on Non-Unix Systems
• OSBC, Perl modules for: The CPAN modules Directory
• $OS_ERROR: Special Variables in Alphabetical Order
• $OSNAME: Special Variables in Alphabetical Order
• our declarations: Name Lookups
• • Statements and Declarations
  • our
  • context rules and: Scalar and List Context
  • global variables, lexically scoped: Lexically Scoped Global Declarations: our
• our function: Scoped Variable Declarations
• • Lexically Scoped Variables: my
  • our
• out of memory errors: Special Variables in Alphabetical Order
• output: fileno
• • (see also STDOUT filehandle)
  • array and hash, changing style (debugger): Debugger Options
  • checking file descriptors for: select (ready file descriptors)
  • debugger, setting: Unattended Execution
  • field separator (see $, variable)
  • files, open mode for: open
  • format output accumulator: formline
  • functions dealing with: Perl Functions by Category
  • ioctl function: ioctl
  • pipes: Pipes
  • • Pipes
    • bidirectional: Bidirectional Communication
    • filtering: Talking to Yourself
    • STDOUT as pipe to another program: Anonymous Pipes
    • tridirectional: Bidirectional Communication
  • record separator (see $\ variable)
  • selecting filehandles for: select (output filehandle)
  • XSUBs: XSUB Input and Output
• output filehandles: Filehandles
• • Filehandles
• output record formats, declaring: Formats
• $OUTPUT_AUTOFLUSH: Special Variables in Alphabetical Order
• $OUTPUT_FIELD_SEPARATOR: Special Variables in Alphabetical Order
• $OUTPUT_RECORD_SEPARATOR: Special Variables in Alphabetical Order
• overloading, mathematical functions: Overloadable Operators
• overload handlers: Overload Handlers
• overloaded, functions: Scalar and List Context
• Overloaded (overload::Overloaded): Public Overload Functions
• overloaded string constants, translating text with: Defining Your Own Assertions
• overloading: Unary and Binary Operators
• • Overloading
  • autogeneration of: Overloadable Operators
  • • Overloadable Operators
  • circular references, avoiding: Overloadable Operators
  • constants: Overloading Constants
  • copy constructor (=): The Copy Constructor (=)
  • diagnostics: Overloading Diagnostics
  • functions for: Public Overload Functions
  • inheritance and: Inheritance and Overloading
  • nonmethod and fallback: When an Overload Handler Is Missing (nomethod and fallback)
  • overload module: Data Types
  • overload pragma: The overload Pragma
  • overloadable operators: Overloadable Operators
  • at run time: Run-Time Overloading
  • sorting and: Overloadable Operators
  • stringifying: Filehandle-Tying Methods
• overridden methods, base class, invoking all: UNIVERSAL: The Ultimate Ancestor Class
• overriding, base class methods: Accessing Overridden Methods
• overriding functions: Overriding Built-in Functions
• overwriting existing files, race conditions and: Handling Race Conditions
• ownership, file: chown

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