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Index: O

• /o pattern modifier: Pattern Modifiers (Developing Perl)
• • Pattern Modifiers (Developing Perl)
  • The m// Operator (Matching) (Perl Developing)
  • The s/// Operator (Substitution) (Perl Developing)
  • suppressing with recompilation: Variable Interpolation (Developing Perl)
• -O option (dprofpp): The Perl Profiler (Perl tutorial)
• -o file test operator
• • File Test Operators (Perl tutorial)
• o command (CPAN.pm): Reference: o (Perl tutorial)
• O command (debugger): Reference: O (Perl tutorial)
• O_ flags: Opening a File (Perl tutorial)
• • O_NDELAY option: Nonblocking Filehandles (Advanced Perl Developing)
  • O_NONBLOCK option: Doing Non-Blocking I/O (Perl tutorial)
• O module: O (Perl tutorial)
• • Compiler Backends (Developing Perl)
  • Code Development Tools (Developing Perl)
  • Perl Compiler and Code Generator (Developing Perl)
• object-oriented developing (OOP): OO: An Introduction (Advanced Perl Developing)
• • Introduction (Perl tutorial)
  • Object-Oriented Perl (Perl tutorial)
  • other languages and: Tcl (Advanced Perl Developing)
  • polymorphism: The Need for Polymorphism (Advanced Perl Developing)
• object: Packages (Developing Perl)
• Object Identifier (OID): The Twenty-Minute SNMP Tutorial (Perl for System Administration)
• object methods:
• • locking: Locking methods (Developing Perl)
  • Thread objects: The Thread Module (Developing Perl)
• object-oriented modules: Using Modules (Developing Perl)
• • method calls, allowing: Creating Modules (Developing Perl)
• object-oriented developing: Packages (Developing Perl)
• • Brief Refresher on Object-Oriented Lingo (Developing Perl)
  • abstraction in: Method Invocation (Developing Perl)
  • modules for file, directory, and IPC access: Filehandle, Directory Handle, and Stream I/O Utilities (Developing Perl)
  • Perl modules for: The CPAN modules Directory (Developing Perl)
  • portable filename operations: Filenames, Filesystems, and File Locking (Developing Perl)
  • references in Perl, emulating: Packages (Developing Perl)
• objects: Objects in Perl (Advanced Perl Developing)
• • Perl Objects (Advanced Perl Developing)
  • Introduction (Perl tutorial)
  • Object-Oriented Perl (Perl tutorial)
  • Complexities (Developing Perl)
  • Objects (Developing Perl)
  • associations between: Object Associations (Advanced Perl Developing)
  • attributes of: Accessor Methods (Advanced Perl Developing)
  • • Attributes (Advanced Perl Developing)
    • Efficient Attribute Storage (Advanced Perl Developing)
    • Introduction (Perl tutorial)
    • Managing Instance Data (Perl tutorial)
    • inheritance and: Solving the Data Inheritance Problem (Perl tutorial)
  • blessing: The Arrow Operator (Developing Perl)
  • • bless (Developing Perl)
  • class data, managing: Managing Class Data (Developing Perl)
  • cloning parent objects: Cloning Objects (Perl tutorial)
  • closures: Closures Versus Objects (Advanced Perl Developing)
  • • Objects versus closures (Advanced Perl Developing)
    • Using Closures Instead of Objects (Perl tutorial)
  • constructors: Object Constructors (Developing Perl)
  • • Object Construction (Developing Perl)
    • inheritable: Inheritable Constructors (Developing Perl)
    • initializers: Initializers (Developing Perl)
  • delegation: Delegation (Advanced Perl Developing)
  • destroying: Object Destruction (Advanced Perl Developing)
  • • Introduction (Perl tutorial)
    • Destroying an Object (Perl tutorial)
  • destruction of (global), controlling: Environment Variables (Developing Perl)
  • determining subclass membership: Determining Subclass Membership (Perl tutorial)
  • faster: Peek into the Future (Advanced Perl Developing)
  • functions dealing with: Perl Functions by Category (Developing Perl)
  • functions for: Perl Functions by Category (Perl tutorial)
  • identity of: Object Identity (Advanced Perl Developing)
  • indirect (see indirect objects)
  • inheritance, through @ISA array: Inheritance Through @ISA (Developing Perl)
  • instance data, managing: Managing Instance Data (Developing Perl)
  • • Field Declarations with use fields (Developing Perl)
    • generating accesors with closures: Generating Accessors with Closures (Developing Perl)
    • generating accessors with autoloading: Generating Accessors with Autoloading (Developing Perl)
    • generating classes with Class::Struct: Generating Classes with Class::Struct (Developing Perl)
    • new features, Perl 5.6: New Tricks (Developing Perl)
    • private objects, using closures for: Using Closures for Private Objects (Developing Perl)
  • instance destructors: Instance Destructors (Developing Perl)
  • • garbage collection with: Garbage Collection with DESTROY Methods (Developing Perl)
  • instance vs. class methods: Object Syntax (Perl tutorial)
  • IO objects: IO Objects and Filehandles (Advanced Perl Developing)
  • managing instance data: Managing Instance Data (Perl tutorial)
  • methods: Introduction (Perl tutorial)
  • methods, references to: Closures (Developing Perl)
  • • Closures (Developing Perl)
    • (see also closures)
  • Perl object system: Perl's Object System (Developing Perl)
  • pointers: SVs and object pointers (Advanced Perl Developing)
  • references: Unique Identity (Advanced Perl Developing)
  • references to, in scalars: Singularities (Developing Perl)
  • storing within other objects vs. inheritance: Instance Destructors (Developing Perl)
  • stringifying: Other Tricks You Can Do with Hard References (Developing Perl)
  • syntax of: Objects (Advanced Perl Developing)
  • tied objects: Creating Magic Variables with tie (Perl tutorial)
  • tied variables, underlying: Tied Variables (Developing Perl)
  • • breaking reference to: Subtle Untying Trap (Developing Perl)
  • uniquess of: Uniqueness of Objects in Memory (Advanced Perl Developing)
• ObjectTemplate library: ObjectTemplate: Attribute Storage Using Arrays (Advanced Perl Developing)
• • Adaptor: An Introduction (Advanced Perl Developing)
• obtaining Perl
• • modules: How Is CPAN Organized? (Perl tutorial)
  • • Getting and Installing Modules (Perl tutorial)
  • source code: Installing Perl (Perl tutorial)
• oct(): Converting Between Octal and Hexadecimal (Perl tutorial)
• • Reference: oct (Perl tutorial)
• oct function: Numeric Literals (Developing Perl)
• • oct (Developing Perl)
  • • breaking reference to: Numeric Literals (Developing Perl)
    • • oct (Developing Perl)
• octal characters: Converting Between Octal and Hexadecimal (Perl tutorial)
• • Numeric Literals (Developing Perl)
  • • breaking reference to: Numeric Literals (Developing Perl)
• octal numbers: oct (Developing Perl)
• • • breaking reference to: oct (Developing Perl)
  • characters, representing: Building Character (Developing Perl)
  • characters, specifying with: Specific Characters (Developing Perl)
  • specifying $/ as: Switches (Developing Perl)
• octets (see bytes)
• ODBC Driver Manager: Interacting with an SQL Server from Perl (Perl for System Administration)
• ODBC (Open Database Connectivity)
• • DSN (Data Source Name): Using the ODBC Framework (Perl for System Administration)
  • using from Perl: Using the ODBC Framework (Perl for System Administration)
• ODBC module: Win32::ODBC (Advanced Perl Developing)
• ODBC specification: Relational Databases (Advanced Perl Developing)
• ODBM_File module: ODBM_File (Perl tutorial)
• • for m// successes: pos (Developing Perl)
  • read function and: read (Developing Perl)
  • seek function: seek (Developing Perl)
• -offvalue option
• • Checkbutton widget: The Checkbutton Widget (Perl tutorial)
  • Menubutton widget: Menu Item Options (Perl tutorial)
• $OFMT ($#) variable
• • Global Special Variables (Perl tutorial)
• $OFS ($,) variable: Global Special Variables (Perl tutorial)
• OID (Object Identifier): The Twenty-Minute SNMP Tutorial (Perl for System Administration)
• OLE automation: OLE Automation (Perl tutorial)
• OLE, Perl modules for: The CPAN modules Directory (Developing Perl)
• one-liners: How to Do It (Developing Perl)
• one-to-many associations: Object Associations (Advanced Perl Developing)
• -onvalue option
• • Checkbutton widget: The Checkbutton Widget (Perl tutorial)
  • Menubutton widget: Menu Item Options (Perl tutorial)
• OOP (see object-oriented developing)
• Opcode module: Opcode (Perl tutorial)
• • Authentication, Security, and Encryption (Developing Perl)
• opcodes: Translator (Advanced Perl Developing)
• • Compiling Your Code (Developing Perl)
  • Executing Your Code (Developing Perl)
  • How Perl Works (Developing Perl)
• Open() Win32::Registry (Perl tutorial)
• Open Database Connectivity (see ODBC)
• open function: Filehandles (Developing Perl)
• • Anonymous Pipes (Developing Perl)
  • open (Developing Perl)
  • $. and: close (Developing Perl)
  • converting file descriptor to filehandle: Passing Filehandles (Developing Perl)
  • fileno function and: fileno (Developing Perl)
  • for pipes, security risks posed by: Cleaning Up Your Environment (Developing Perl)
  • fork-open: open (Developing Perl)
  • forking open: Talking to Yourself (Developing Perl)
  • modes in three-argument form: open (Developing Perl)
  • piped list argument formCode Masquerading as Data (Developing Perl)
  • piped (two-argument form): open (Developing Perl)
  • pipes, opening with: Anonymous Pipes (Developing Perl)
  • portability of: (Developing Perl) 25.5. Interprocess Communication (IPC)
• Open2, Open3 library modules: Bidirectional Communication (Developing Perl)
• opendir(): Filehandles, Directory Handles, and Formats (Advanced Perl Developing)
• • Introduction (Perl tutorial)
  • Processing All Files in a Directory (Perl tutorial)
  • Reference: opendir (Perl tutorial)
  • globbing filenames: Globbing, or Getting a List of Filenames Matching a Pattern (Perl tutorial)
• opendir function: opendir (Developing Perl)
• opening
• • file descriptors: Opening and Closing File Descriptors by Number (Perl tutorial)
  • files: Opening a File (Perl tutorial)
  • files via low-level system call: sysopen (Developing Perl)
  • sockets: socket (Developing Perl)
• OpenRequest() (Win32::Internet): Reference: OpenRequest (Perl tutorial)
• OpenURL() (Win32::Internet): Reference: OpenURL (Perl tutorial)
• operand stack: Executing Your Code (Developing Perl)
• operating system name: Special Variables in Alphabetical Order (Developing Perl)
• • The Pursuit of Happiness (Developing Perl)
  • #! technique, simulating on non-Unix systems: #! and Quoting on Non-Unix Systems (Developing Perl)
  • command interpreters for: Command Processing (Developing Perl)
  • flock support on: File Locking (Developing Perl)
  • fork operator, support for: Passing Filehandles (Developing Perl)
  • GUIs, relying on: System Interaction (Developing Perl)
  • interfaces to, manipulating: Operating System Interfaces (Developing Perl)
  • invoking interpreters with #! line: Command Processing (Developing Perl)
  • module names, translating to directory names: Using Modules (Developing Perl)
  • newlines, variations in: Newlines (Developing Perl)
  • perl interpreter, starting on: How to Do It (Developing Perl)
  • Perl modules for: The CPAN modules Directory (Developing Perl)
  • Perl ports to: CPAN (Developing Perl)
  • Perl program portability: Portable Perl (Developing Perl)
  • signal reliability on: Reaping Zombies (Developing Perl)
  • signals and default behaviors of: Signals (Developing Perl)
  • sockets, support for: Sockets (Developing Perl)
  • threading libraries: The Thread Model (Developing Perl)
• operations, evaluation in contexts: Scalar and List Context (Developing Perl)
• operators
• • Operators (Perl tutorial)
  • Operators (Developing Perl)
  • Unary and Binary Operators (Developing Perl)
  • access, restricting with Safe module: Restricting operator access (Developing Perl)
  • assignment operators: Assignment Operators (Developing Perl)
  • associativity of: Unary and Binary Operators (Developing Perl)
  • C language, missing in Perl: Operators Missing from Perl (Developing Perl)
  • overloading: Overloading Operators (Perl tutorial)
• for loop control: Loop Control (Developing Perl)
• • logical operators: Logical Operators (Developing Perl)
  • matching and substitution: Pattern Matching (Developing Perl)
  • overloadable: Overloadable Operators (Developing Perl)
  • • arithmetic operators: Overloadable Operators (Developing Perl)
    • assignment operators: Overloadable Operators (Developing Perl)
    • bitwise operators: Overloadable Operators (Developing Perl)
    • circular references, problems with: Overloadable Operators (Developing Perl)
    • comparison operators: Overloadable Operators (Developing Perl)
    • conversion operators: Overloadable Operators (Developing Perl)
    • dereference operators: Overloadable Operators (Developing Perl)
    • iterative operator: Overloadable Operators (Developing Perl)
    • logical negation operator: Overloadable Operators (Developing Perl)
  • overloading: Unary and Binary Operators (Developing Perl)
  • • Overloading (Developing Perl)
    • Data Types (Developing Perl)
  • pattern-matching: Pattern-Matching Operators (Developing Perl)
  • • modifiers for: Pattern Modifiers (Developing Perl)
  • positions or lengths, switching to character positions: Effects of Character Semantics (Developing Perl)
  • precedence of: Some Binary Arithmetic Operators (Developing Perl)
  • • Unary and Binary Operators (Developing Perl)
    • C precedence, retaining in Perl: Unary and Binary Operators (Developing Perl)
  • quotes, syntactical similarity to: Singularities (Developing Perl)
  • quoting operators: Pick Your Own Quotes (Developing Perl)
  • scalar context, supplying to parameters: Singularities (Developing Perl)
  • string operators: String Operators (Developing Perl)
  • verbs as: Verbs (Developing Perl)
• ops module: ops (Perl tutorial)
• • Authentication, Security, and Encryption (Developing Perl)
• optimizing
• • in the Perl compiler: Compiling Your Code (Developing Perl)
  • performance and: Efficiency (Developing Perl)
• optimizing Perl: Compilation and code generation stages (Advanced Perl Developing)
• option processing, Perl modules for: Option, Argument, Parameter, and Configuration File Processing (Developing Perl)
• Optionmenu widget (Perl/Tk): The Optionmenu Widget (Perl tutorial)
• options: Switches (Developing Perl)
• -options option (Optionmenu): The Optionmenu Widget (Perl tutorial)
• OR (||) operator: Establishing a Default Value (Perl tutorial)
• • Logical Operators (Perl tutorial)
  • Operators (Developing Perl) 3.14. C-Style Logical (Short-Circuit)
  • list operators and: Global Declarations (Developing Perl)
• OR functionality in regular expressions: Expressing AND, OR, and NOT in a Single Pattern (Perl tutorial)
• OR logical operator: Logical Operators (Developing Perl)
• Or operator: Logical Operators (Developing Perl)
• Oracle module: DBI (Database Interface) (Advanced Perl Developing)
• oraperl: DBI (Database Interface) (Advanced Perl Developing)
• • Design of DBI (Perl tutorial)
• ORBS (Open Relay Behaviour-Modification System): Checking against Internet-wide blacklists (Perl for System Administration)
• ord(): Converting Between ASCII Characters and Values (Perl tutorial)
• • Reference: ord (Perl tutorial)
• ord function: Effects of Character Semantics (Developing Perl)
• • ord (Developing Perl)
• order (see precedence)
• • of function precedence: Functions (Developing Perl)
• oreobounce program (example): Redirecting to a Different Location (Perl tutorial)
• -orient option
• • Scale widget: The Scale Widget (Perl tutorial)
  • Scrollbar widget: The Scrollbar Widget (Perl tutorial)
• ornaments option (debugger): Debugger Options (Developing Perl)
• $ORS ($\) variable: Global Special Variables (Perl tutorial)
• orthogonal (transparent) persistence: Implementing Object Persistence (Advanced Perl Developing)
• • Design Goals (Advanced Perl Developing)
• Orwant, Jon: The Perl Journal (Perl tutorial)
• OS/2 operating system, invoking Perl applications on: #! and Quoting on Non-Unix Systems (Developing Perl)
• $OS_ERROR ($!) variable: Global Special Variables (Perl tutorial)
• OSBC, Perl modules for: The CPAN modules Directory (Developing Perl)
• $OS_ERROR: Special Variables in Alphabetical Order (Developing Perl)
• $OSNAME:: Special Variables in Alphabetical Order (Developing Perl)
• os_snipe program (example): Redirecting to a Different Location (Perl tutorial)
• $OSNAME ($^O) variable: Global Special Variables (Perl tutorial)
• our declarations: Name Lookups (Developing Perl)
• • Statements and Declarations (Developing Perl)
  • our (Developing Perl)
  • context rules and: Scalar and List Context (Developing Perl)
  • global variables, lexically scoped: Lexically Scoped Global Declarations: our (Developing Perl)
• our function: Scoped Variable Declarations (Developing Perl)
• • Lexically Scoped Variables: my (Developing Perl)
  • our (Developing Perl)
• Ousterhout, John: The Case for Scripting (Advanced Perl Developing)
• out of memory errors: Special Variables in Alphabetical Order (Developing Perl)
• output: Perl Functions by Category (Perl tutorial)
• • fileno (Developing Perl)
  • (see also STDOUT filehandle)
  • array and hash, changing style (debugger): Debugger Options (Developing Perl)
  • checking file descriptors for: select (ready file descriptors (Developing Perl) )
  • controlling decimal places: Overloading Operators (Perl tutorial)
  • controlling for other programs: Controlling Input and Output of Another Program (Perl tutorial)
  • debugger, setting: Unattended Execution (Developing Perl)
  • field separator (see $, variable)
  • files, open mode for: open (Developing Perl)
  • filtering: Filtering Your Own Output (Perl tutorial)
  • flushing: Flushing Output (Perl tutorial)
  • format output accumulator: formline (Developing Perl)
  • formats for: Formats (Perl tutorial)
  • functions dealing with: Perl Functions by Category (Developing Perl)
  • gathering from programs: Gathering Output from a Program (Perl tutorial)
  • ioctl function: ioctl (Developing Perl)
  • pipes: Pipes (Developing Perl)
  • • Pipes (Developing Perl)
    • bidirectional: Bidirectional Communication (Developing Perl)
    • filtering: Talking to Yourself (Developing Perl)
    • STDOUT as pipe to another program: Anonymous Pipes (Developing Perl)
    • tridirectional: Bidirectional Communication (Developing Perl)
  • random access I/O: Using Random-Access I/O (Perl tutorial)
  • record separator (see $\ variable)
  • selecting filehandles for: (Developing Perl) 29.2.140. select (output filehandle)
  • writing to other programs: Reading or Writing to Another Program (Perl tutorial)
  • XSUBs: XSUB Input and Output (Developing Perl)
• output filehandles: Filehandles (Developing Perl)
• output record formats, declaring: Formats (Developing Perl)
• $OUTPUT_AUTOFLUSH: Special Variables in Alphabetical Order (Developing Perl)
• $OUTPUT_AUTOFLUSH ($|) variable: Introduction (Perl tutorial)
• • Flushing Output (Perl tutorial)
  • Filehandle Special Variables (Perl tutorial)
• OutputCP() (Win32::Console): Reference: OutputCP (Perl tutorial)
• =over command (pod): Reference: =over (Perl tutorial)
• $OUTPUT_FIELD_SEPARATOR: Special Variables in Alphabetical Order (Developing Perl)
• $OUTPUT_FIELD_SEPARATOR ($,) variable: Global Special Variables (Perl tutorial)
• $OUTPUT_RECORD_SEPARATOR: Special Variables in Alphabetical Order (Developing Perl)
• $OUTPUT_RECORD_SEPARATOR ($\) variable: Global Special Variables (Perl tutorial)
• overload module: overload (Perl tutorial)
• overloaded functions: Scalar and List Context (Developing Perl)
• Overloaded (overload::Overloaded): Public Overload Functions (Developing Perl)
• overloaded string constants, translating text with: Defining Your Own Assertions (Developing Perl)
• overloading, mathematical functions: Overloadable Operators (Developing Perl)
• overload handlers: Overload Handlers (Developing Perl)
• overridden methods, base class, invoking all: UNIVERSAL: The Ultimate Ancestor Class (Developing Perl)
• overridedirect() (Frame widget): Toplevel Methods (Perl tutorial)
• overriding, base class methods: Accessing Overridden Methods (Developing Perl)
• built-in methods, overridden: Accessing Overridden Methods (Developing Perl)
• overview_fmt() (Net::NNTP): Reference: overview_fmt (Perl tutorial)
• overwriting existing files, race conditions and: Handling Race Conditions (Developing Perl)
• ownership, file: chown (Developing Perl)

Symbols | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z