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Index: O
- /o pattern modifier: 5.2.1. Pattern Modifiers (Programming Perl)
- 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)
- suppressing with recompilation: 5.9.2. Variable Interpolation (Programming Perl)
- -O option (dprofpp): 6.5. The Perl Profiler (Perl in a Nutshell)
- -o file test operator
- 4.5.8. File Test Operators (Perl in a Nutshell)
- o command (CPAN.pm): Chapter 2, Reference: o (Perl in a Nutshell)
- O command (debugger): Chapter 6, Reference: O (Perl in a Nutshell)
- O_ flags: 7.1. Opening a File (Perl Cookbook)
- O module: 8.115. O (Perl in a Nutshell)
- 18.4. Compiler Backends (Programming Perl)
- 18.6. Code Development Tools (Programming Perl)
- 32.1.19. Perl Compiler and Code Generator (Programming Perl)
- object-oriented programming (OOP): 7.1. OO: An Introduction (Advanced Perl Programming)
- object: 10. Packages (Programming Perl)
- Object Identifier (OID): E. The Twenty-Minute SNMP Tutorial (Perl for System Administration)
- object methods:
- object-oriented modules: 11.1. Using Modules (Programming Perl)
- object-oriented programming: 10. Packages (Programming Perl)
- 12.1. Brief Refresher on Object-Oriented Lingo (Programming Perl)
- abstraction in: 12.3. Method Invocation (Programming Perl)
- modules for file, directory, and IPC access: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities (Programming Perl)
- Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)
- portable filename operations: 32.1.4. Filenames, Filesystems, and File Locking (Programming Perl)
- references in Perl, emulating: 10. Packages (Programming Perl)
- objects: 7.2. Objects in Perl (Advanced Perl Programming)
- 20.2.1. Perl Objects (Advanced Perl Programming)
- 13.0. Introduction (Perl Cookbook)
- 7.3. Object-Oriented Perl (Perl in a Nutshell)
- 1.2.1.3. Complexities (Programming Perl)
- 12. Objects (Programming Perl)
- associations between: 11.2.7. Object Associations (Advanced Perl Programming)
- attributes of: 7.2.8. Accessor Methods (Advanced Perl Programming)
- blessing: 3.2. The Arrow Operator (Programming Perl)
- 29.2.7. bless (Programming Perl)
- class data, managing: 12.8. Managing Class Data (Programming Perl)
- cloning parent objects: 13.6. Cloning Objects (Perl Cookbook)
- closures: 4.4.3. Closures Versus Objects (Advanced Perl Programming)
- 20.3.5.4. Objects versus closures (Advanced Perl Programming)
- 11.7. Using Closures Instead of Objects (Perl Cookbook)
- constructors: 8.2.3. Object Constructors (Programming Perl)
- delegation: 8.2. Delegation (Advanced Perl Programming)
- destroying: 7.2.7. Object Destruction (Advanced Perl Programming)
- 13.0. Introduction (Perl Cookbook)
- 13.2. Destroying an Object (Perl Cookbook)
- destruction of (global), controlling: 19.2. Environment Variables (Programming Perl)
- determining subclass membership: 13.8. Determining Subclass Membership (Perl Cookbook)
- faster: 20.7. A Peek into the Future (Advanced Perl Programming)
- functions dealing with: 29.1. Perl Functions by Category (Programming Perl)
- functions for: 5.1. Perl Functions by Category (Perl in a Nutshell)
- identity of: 11.2.6. Object Identity (Advanced Perl Programming)
- indirect (see indirect objects)
- inheritance, through @ISA array: 12.5.1. Inheritance Through @ISA (Programming Perl)
- instance data, managing: 12.7. Managing Instance Data (Programming Perl)
- 12.7.1. Field Declarations with use fields (Programming Perl)
- generating accesors with closures: 12.7.4. Generating Accessors with Closures (Programming Perl)
- generating accessors with autoloading: 12.7.3. Generating Accessors with Autoloading (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)
- private objects, using closures for: 12.7.5. Using Closures for Private Objects (Programming Perl)
- instance destructors: 12.6. Instance Destructors (Programming Perl)
- instance vs. class methods: 7.4. Object Syntax (Perl in a Nutshell)
- IO objects: 12.5. IO Objects and Filehandles (Advanced Perl Programming)
- managing instance data: 13.3. Managing Instance Data (Perl Cookbook)
- methods: 13.0. Introduction (Perl Cookbook)
- methods, references to: 8.3.7. Closures (Programming Perl)
- 8.3.7. Closures (Programming Perl)
- (see also closures)
- Perl object system: 12.2. Perl's Object System (Programming Perl)
- pointers: 20.3.1.3. SVs and object pointers (Advanced Perl Programming)
- references: 7.2.2. Unique Identity (Advanced Perl Programming)
- references to, in scalars: 1.2.1.1. Singularities (Programming Perl)
- storing within other objects vs. inheritance: 12.6. Instance Destructors (Programming Perl)
- stringifying: 8.3.6. Other Tricks You Can Do with Hard References (Programming Perl)
- syntax of: B.5. Objects (Advanced Perl Programming)
- tied objects: 13.15. Creating Magic Variables with tie (Perl Cookbook)
- tied variables, underlying: 14. Tied Variables (Programming Perl)
- uniquess of: 11.2.8. Uniqueness of Objects in Memory (Advanced Perl Programming)
- ObjectTemplate library: 8.1.1. ObjectTemplate: Attribute Storage Using Arrays (Advanced Perl Programming)
- 11.1. Adaptor: An Introduction (Advanced Perl Programming)
- obtaining Perl
- oct(): 2.16. Converting Between Octal and Hexadecimal (Perl Cookbook)
- Chapter 5, Reference: oct (Perl in a Nutshell)
- oct function: 2.6.1. Numeric Literals (Programming Perl)
- octal characters: 2.16. Converting Between Octal and Hexadecimal (Perl Cookbook)
- octal numbers: 29.2.103. oct (Programming Perl)
- octets (see bytes)
- ODBC Driver Manager: 7.1. Interacting with an SQL Server from Perl (Perl for System Administration)
- ODBC (Open Database Connectivity)
- ODBC module: 10.4.2. Win32::ODBC (Advanced Perl Programming)
- ODBC specification: 10.4. Relational Databases (Advanced Perl Programming)
- ODBM_File module: 8.116. ODBM_File (Perl in a Nutshell)
- -offvalue option
- $OFMT ($#) variable
- 4.4.1. Global Special Variables (Perl in a Nutshell)
- $OFS ($,) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)
- OID (Object Identifier): E. The Twenty-Minute SNMP Tutorial (Perl for System Administration)
- OLE automation: 19.18. OLE Automation (Perl in a Nutshell)
- OLE, Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)
- one-liners: 1.3.1. How to Do It (Programming Perl)
- one-to-many associations: 11.2.7. Object Associations (Advanced Perl Programming)
- -onvalue option
- OOP (see object-oriented programming)
- Opcode module: 8.117. Opcode (Perl in a Nutshell)
- 32.1.12. Authentication, Security, and Encryption (Programming Perl)
- opcodes: 20.2.2. Translator (Advanced Perl Programming)
- 18.2. Compiling Your Code (Programming Perl)
- 18.3. Executing Your Code (Programming Perl)
- 21.1. How Perl Works (Programming Perl)
- Open() 19.13. Win32::Registry (Perl in a Nutshell)
- Open Database Connectivity (see ODBC)
- open function: 1.4. Filehandles (Programming Perl)
- 16.3.1. Anonymous Pipes (Programming Perl)
- 29.2.104. open (Programming Perl)
- $. and: 29.2.16. close (Programming Perl)
- converting file descriptor to filehandle: 16.2.2. Passing Filehandles (Programming Perl)
- fileno function and: 29.2.38. fileno (Programming Perl)
- for pipes, security risks posed by: 23.1.2. Cleaning Up Your Environment (Programming Perl)
- fork-open: 29.2.104. open (Programming Perl)
- forking open: 16.3.2. Talking to Yourself (Programming Perl)
- modes in three-argument form: 29.2.104. open (Programming Perl)
- piped list argument form 23.3.2. Code Masquerading as Data (Programming Perl)
- piped (two-argument form): 29.2.104. open (Programming Perl)
- pipes, opening with: 16.3.1. Anonymous Pipes (Programming Perl)
- portability of: (Programming Perl) 25.5. Interprocess Communication (IPC)
- Open2, Open3 library modules: 16.3.3. Bidirectional Communication (Programming Perl)
- opendir(): 3.4. Filehandles, Directory Handles, and Formats (Advanced Perl Programming)
- opendir function: 29.2.105. opendir (Programming Perl)
- opening
- OpenRequest() (Win32::Internet): Chapter 19, Reference: OpenRequest (Perl in a Nutshell)
- OpenURL() (Win32::Internet): Chapter 19, Reference: OpenURL (Perl in a Nutshell)
- operand stack: 18.3. Executing Your Code (Programming Perl)
- operating system name: 28.2. Special Variables in Alphabetical Order (Programming Perl)
- 0.1. The Pursuit of Happiness (Programming Perl)
- #! technique, simulating on non-Unix systems: 19.1.1. #! and Quoting on Non-Unix Systems (Programming Perl)
- command interpreters for: 19.1. Command Processing (Programming Perl)
- flock support on: 16.2.1. File Locking (Programming Perl)
- fork operator, support for: 16.2.2. Passing Filehandles (Programming Perl)
- GUIs, relying on: 25.4. System Interaction (Programming Perl)
- interfaces to, manipulating: 32.1.7. Operating System Interfaces (Programming Perl)
- invoking interpreters with #! line: 19.1. Command Processing (Programming Perl)
- module names, translating to directory names: 11.1. Using Modules (Programming Perl)
- newlines, variations in: 25.1. Newlines (Programming Perl)
- perl interpreter, starting on: 1.3.1. How to Do It (Programming Perl)
- Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)
- Perl ports to: 22. CPAN (Programming Perl)
- Perl program portability: 25. Portable Perl (Programming Perl)
- signal reliability on: 16.1.2. Reaping Zombies (Programming Perl)
- signals and default behaviors of: 16.1. Signals (Programming Perl)
- sockets, support for: 16.5. Sockets (Programming Perl)
- threading libraries: 17.2. The Thread Model (Programming Perl)
- operations, evaluation in contexts: 2.7.1. Scalar and List Context (Programming Perl)
- operators
- 4.5. Operators (Perl in a Nutshell)
- 1.5. Operators (Programming Perl)
- 3. Unary and Binary Operators (Programming Perl)
- access, restricting with Safe module: 23.3.1.2. Restricting operator access (Programming Perl)
- assignment operators: 1.5.3. Assignment Operators (Programming Perl)
- associativity of: 3. Unary and Binary Operators (Programming Perl)
- C language, missing in Perl: 3.21. C Operators Missing from Perl (Programming Perl)
- overloading: 13.14. Overloading Operators (Perl Cookbook)
- for loop control: 4.4.4. Loop Control (Programming Perl)
- logical operators: 1.5.5. Logical Operators (Programming Perl)
- matching and substitution: 5. Pattern Matching (Programming Perl)
- overloadable: 13.3. Overloadable Operators (Programming Perl)
- arithmetic operators: 13.3. Overloadable Operators (Programming Perl)
- assignment operators: 13.3. Overloadable Operators (Programming Perl)
- bitwise operators: 13.3. Overloadable Operators (Programming Perl)
- circular references, problems with: 13.3. Overloadable Operators (Programming Perl)
- comparison operators: 13.3. Overloadable Operators (Programming Perl)
- conversion operators: 13.3. Overloadable Operators (Programming Perl)
- dereference operators: 13.3. Overloadable Operators (Programming Perl)
- iterative operator: 13.3. Overloadable Operators (Programming Perl)
- logical negation operator: 13.3. Overloadable Operators (Programming Perl)
- overloading: 3. Unary and Binary Operators (Programming Perl)
- 13. Overloading (Programming Perl)
- 32.1.1. Data Types (Programming Perl)
- pattern-matching: 5.2. Pattern-Matching Operators (Programming Perl)
- positions or lengths, switching to character positions: 15.2. Effects of Character Semantics (Programming Perl)
- precedence of: 1.5.1. Some Binary Arithmetic Operators (Programming Perl)
- quotes, syntactical similarity to: 1.2.1.1. Singularities (Programming Perl)
- quoting operators: 2.6.3. Pick Your Own Quotes (Programming Perl)
- scalar context, supplying to parameters: 1.2.1.1. Singularities (Programming Perl)
- string operators: 1.5.2. String Operators (Programming Perl)
- verbs as: 1.2.2. Verbs (Programming Perl)
- ops module: 8.118. ops (Perl in a Nutshell)
- 32.1.12. Authentication, Security, and Encryption (Programming Perl)
- optimizing
- optimizing Perl: 20.2.2.2. Compilation and code generation stages (Advanced Perl Programming)
- option processing, Perl modules for: 32.1.3. Option, Argument, Parameter, and Configuration File Processing (Programming Perl)
- Optionmenu widget (Perl/Tk): 18.16. The Optionmenu Widget (Perl in a Nutshell)
- options: 19.1.3. Switches (Programming Perl)
- -options option (Optionmenu): 18.16. The Optionmenu Widget (Perl in a Nutshell)
- OR (||) operator: 1.2. Establishing a Default Value (Perl Cookbook)
- 4.5.9. Logical Operators (Perl in a Nutshell)
- Operators (Programming Perl) 3.14. C-Style Logical (Short-Circuit)
- list operators and: 4.7. Global Declarations (Programming Perl)
- OR functionality in regular expressions: 6.17. Expressing AND, OR, and NOT in a Single Pattern (Perl Cookbook)
- OR logical operator: 1.5.5. Logical Operators (Programming Perl)
- Or operator: 1.5.5. Logical Operators (Programming Perl)
- Oracle module: 10.4.1. DBI (Database Interface) (Advanced Perl Programming)
- oraperl: 10.4.1. DBI (Database Interface) (Advanced Perl Programming)
- 12.2. Design of DBI (Perl in a Nutshell)
- ORBS (Open Relay Behaviour-Modification System): 8.3.3.2. Checking against Internet-wide blacklists (Perl for System Administration)
- ord(): 1.4. Converting Between ASCII Characters and Values (Perl Cookbook)
- Chapter 5, Reference: ord (Perl in a Nutshell)
- ord function: 15.2. Effects of Character Semantics (Programming Perl)
- 29.2.106. ord (Programming Perl)
- order (see precedence)
- oreobounce program (example): 19.8. Redirecting to a Different Location (Perl Cookbook)
- -orient option
- ornaments option (debugger): 20.3.3. Debugger Options (Programming Perl)
- $ORS ($\) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)
- orthogonal (transparent) persistence: 11. Implementing Object Persistence (Advanced Perl Programming)
- 11.2.1. Design Goals (Advanced Perl Programming)
- Orwant, Jon: 1.4.7. The Perl Journal (Perl in a Nutshell)
- OS/2 operating system, invoking Perl applications on: 19.1.1. #! and Quoting on Non-Unix Systems (Programming Perl)
- $OS_ERROR ($!) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)
- OSBC, Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)
- $OS_ERROR: 28.2. Special Variables in Alphabetical Order (Programming Perl)
- $OSNAME:: 28.2. Special Variables in Alphabetical Order (Programming Perl)
- os_snipe program (example): 19.8. Redirecting to a Different Location (Perl Cookbook)
- $OSNAME ($^O) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)
- our declarations: 2.5.1. Name Lookups (Programming Perl)
- our function: 4.8.1. Scoped Variable Declarations (Programming Perl)
- 4.8.2. Lexically Scoped Variables: my (Programming Perl)
- 29.2.107. our (Programming Perl)
- Ousterhout, John: The Case for Scripting (Advanced Perl Programming)
- out of memory errors: 28.2. Special Variables in Alphabetical Order (Programming Perl)
- output: 5.1. Perl Functions by Category (Perl in a Nutshell)
- 29.2.38. fileno (Programming Perl)
- (see also STDOUT filehandle)
- array and hash, changing style (debugger): 20.3.3. Debugger Options (Programming Perl)
- checking file descriptors for: 29.2.141. select (ready file descriptors (Programming Perl) )
- controlling decimal places: 13.14. Overloading Operators (Perl Cookbook)
- controlling for other programs: 16.8. Controlling Input and Output of Another Program (Perl Cookbook)
- debugger, setting: 20.4. Unattended Execution (Programming Perl)
- field separator (see $, variable)
- files, open mode for: 29.2.104. open (Programming Perl)
- filtering: 16.5. Filtering Your Own Output (Perl Cookbook)
- flushing: 7.12. Flushing Output (Perl Cookbook)
- format output accumulator: 29.2.42. formline (Programming Perl)
- formats for: 4.10. Formats (Perl in a Nutshell)
- functions dealing with: 29.1. Perl Functions by Category (Programming Perl)
- gathering from programs: 16.1. Gathering Output from a Program (Perl Cookbook)
- ioctl function: 29.2.77. ioctl (Programming Perl)
- pipes: 16.3. Pipes (Programming Perl)
- 16.3. Pipes (Programming Perl)
- bidirectional: 16.3.3. Bidirectional Communication (Programming Perl)
- filtering: 16.3.2. Talking to Yourself (Programming Perl)
- STDOUT as pipe to another program: 16.3.1. Anonymous Pipes (Programming Perl)
- tridirectional: 16.3.3. Bidirectional Communication (Programming Perl)
- random access I/O: 8.12. Using Random-Access I/O (Perl Cookbook)
- record separator (see $\ variable)
- selecting filehandles for: (Programming Perl) 29.2.140. select (output filehandle)
- writing to other programs: 16.4. Reading or Writing to Another Program (Perl Cookbook)
- XSUBs: 21.3.3. XSUB Input and Output (Programming Perl)
- output filehandles: 1.4. Filehandles (Programming Perl)
- output record formats, declaring: 7. Formats (Programming Perl)
- $OUTPUT_AUTOFLUSH: 28.2. Special Variables in Alphabetical Order (Programming Perl)
- $OUTPUT_AUTOFLUSH ($|) variable: 7.0. Introduction (Perl Cookbook)
- 7.12. Flushing Output (Perl Cookbook)
- 4.4.6. Filehandle Special Variables (Perl in a Nutshell)
- OutputCP() (Win32::Console): Chapter 19, Reference: OutputCP (Perl in a Nutshell)
- =over command (pod): Chapter 4, Reference: =over (Perl in a Nutshell)
- $OUTPUT_FIELD_SEPARATOR: 28.2. Special Variables in Alphabetical Order (Programming Perl)
- $OUTPUT_FIELD_SEPARATOR ($,) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)
- $OUTPUT_RECORD_SEPARATOR: 28.2. Special Variables in Alphabetical Order (Programming Perl)
- $OUTPUT_RECORD_SEPARATOR ($\) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)
- overload module: 8.119. overload (Perl in a Nutshell)
- overloaded functions: 2.7.1. Scalar and List Context (Programming Perl)
- Overloaded (overload::Overloaded): 13.7. Public Overload Functions (Programming Perl)
- overloaded string constants, translating text with: 5.10.4. Defining Your Own Assertions (Programming Perl)
- overloading, mathematical functions: 13.3. Overloadable Operators (Programming Perl)
- overload handlers: 13.2. Overload Handlers (Programming Perl)
- overridden methods, base class, invoking all: 12.5.3. UNIVERSAL: The Ultimate Ancestor Class (Programming Perl)
- overridedirect() (Frame widget): 18.18.1. Toplevel Methods (Perl in a Nutshell)
- overriding, base class methods: 12.5.2. Accessing Overridden Methods (Programming Perl)
- built-in methods, overridden: 12.5.2. Accessing Overridden Methods (Programming Perl)
- overview_fmt() (Net::NNTP): Chapter 15, Reference: overview_fmt (Perl in a Nutshell)
- overwriting existing files, race conditions and: 23.2.2. Handling Race Conditions (Programming Perl)
- ownership, file: 29.2.13. chown (Programming Perl)
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