Index: O

Symbols & Numbers
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Index: O
- o command (CPAN.pm):  2.4.4. Installing Modules with the CPAN Module (Perl in a Nutshell)
- O command (Perl debugger):  6.2. Debugger Commands (Perl in a Nutshell)
- -o (effective UID) file test:  3.10. Named Unary and File Test Operators (Programming Perl)
- -O file test operator:  4.5.8. File Test Operators (Perl in a Nutshell)
- O_ flags:  7.1.3. Discussion (Perl Cookbook)
- 
  -  7.20.2. Solution (Perl Cookbook)
 
- /o modifier
- 
  
  - recompilation, suppressing with:  5.9.2. Variable Interpolation (Programming Perl)
 
- O module:  8.165. 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)
 
- -O option (dprofpp):  6.5. The Perl Profiler (Perl in a Nutshell)
- -o option (perlcc):  3.4. The Perl Compiler (Perl in a Nutshell)
- /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)
 
- o pattern match modifier:  4.6.1. Pattern-Matching Operators (Perl in a Nutshell)
- /o pattern-matching modifier:  6.10.2. Solution (Perl Cookbook)
- -O (real UID) file test:  3.10. Named Unary and File Test Operators (Programming Perl)
- OASIS group:  22.. Schemas (Perl Cookbook)
- object
- 
  
  - classes:  10. Packages (Programming Perl)
- methods:  8.3.4. Using Object Methods (Programming Perl)
 
- object attributes:  13.3.1. Problem (Perl Cookbook)
- object methods:  13.. Some Notes on Object Terminology (Perl Cookbook)
- 
  
  - locking:  17.2.2.5. Locking methods (Programming Perl)
- Thread objects:  17.2.1. The Thread Module (Programming Perl)
 
- object-oriented modules:  11.1. Using Modules (Programming Perl)
- 
  
  - method calls, allowing:  11.2. Creating Modules (Programming Perl)
 
- object-oriented (OO) programming:  B.20.2. Object-Oriented Programming (Learning Perl)
- object-oriented programming:  13.. Under the Hood (Perl Cookbook)
- 
  -  13.. Some Notes on Object Terminology (Perl Cookbook)
-  7.3. Object-Oriented Perl (Perl in a Nutshell)
-  8. Introduction to Objects (Learning Perl Objects, References and Modules)
-  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:  13.. Under the Hood (Perl Cookbook)
- 
  -  7.3. Object-Oriented Perl (Perl in a Nutshell)
-  1.2.1.3. Complexities (Programming Perl)
-  12. Objects (Programming Perl)
- Glossary (Programming Perl)
- bless operator and:  9.1. A Horse Is a Horse, of Course of Course—or Is It? (Learning Perl Objects, References and Modules)
- as blessed references:  9.8. More Interesting Instances (Learning Perl Objects, References and Modules)
- 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:  13.6.1. Problem (Perl Cookbook)
- closures as:  11.7.1. Problem (Perl Cookbook)
- constructing:  13.. Methods (Perl Cookbook)
- 
    -  13.1.1. Problem (Perl Cookbook)
 
- constructors:  8.2.3. Object Constructors (Programming Perl)
- 
    -  12.4. Object Construction (Programming Perl)
- inheritable:  12.4.1. Inheritable Constructors (Programming Perl)
- initializers:  12.4.2. Initializers (Programming Perl)
 
- creating:  9.4. How to Build a Horse (Learning Perl Objects, References and Modules)
- destroying:  13.. Methods (Perl Cookbook)
- 
    -  13.2.1. Problem (Perl Cookbook)
 
- destruction of:  10. Object Destruction (Learning Perl Objects, References and Modules)
- destruction of (global), controlling:  19.2. Environment Variables (Programming Perl)
- determining subclass membership:  13.9.1. Problem (Perl Cookbook)
- encapsulation of:  9.11. Don't Look Inside the Box (Learning Perl Objects, References and Modules)
- filehandles and:  11.7. References to Filehandles (Learning Perl Objects, References and Modules)
- functions dealing with:  29.1. Perl Functions by Category (Programming Perl)
- functions for:  5.1. Perl Functions by Category (Perl in a Nutshell)
- 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)
- 
    
    - garbage collection with:  12.6.1. Garbage Collection with DESTROY Methods (Programming Perl)
 
- instance vs. class methods:  7.4. Object Syntax (Perl in a Nutshell)
- instances and:  9.1. A Horse Is a Horse, of Course of Course—or Is It? (Learning Perl Objects, References and Modules)
- managing class data:  13.4.1. Problem (Perl Cookbook)
- managing instance data:  13.3.1. Problem (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)
- 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)
- structure considerations:  9.8. More Interesting Instances (Learning Perl Objects, References and Modules)
- testing with isa and can methods:  11.2. Testing Your Objects for Good Behavior (Learning Perl Objects, References and Modules)
- 
    -  11.2. Testing Your Objects for Good Behavior (Learning Perl Objects, References and Modules)
 
- tied objects:  13.15.1. Problem (Perl Cookbook)
- tied variables, underlying:  14. Tied Variables (Programming Perl)
- 
    
    - breaking reference to:  14.5. A Subtle Untying Trap (Programming Perl)
 
 
- Objects style (XML::Parser):  13.4. XML::Parser Styles (Perl in a Nutshell)
- obtaining Perl modules:  2.2. How Is CPAN Organized? (Perl in a Nutshell)
- 
  -  2.4. Getting and Installing Modules (Perl in a Nutshell)
 
- obtaining Perl source code:  2. Installing Perl (Perl in a Nutshell)
- oct( ):  5. Function Reference (Perl in a Nutshell)
- 
-  2.15.2. Solution (Perl Cookbook)
-  2.6.1. Numeric Literals (Programming Perl)
-  29.2.103. oct (Programming Perl)
 
- octal
- 
  
  
- characters:  2.6.1. Numeric Literals (Programming Perl)
- literals:  2.2.4. Nondecimal Integer Literals (Learning Perl)
- numbers
- 
- converting:  2.15.1. Problem (Perl Cookbook)
- values, working with symbolic file permissions instead:  9.11.1. Problem (Perl Cookbook)
-  29.2.103. oct (Programming Perl)
- characters, representing:  15.1. Building Character (Programming Perl)
- characters, specifying with:  5.3.2. Specific Characters (Programming Perl)
- specifying $/ as:  19.1.3. Switches (Programming Perl)
 
 
- octets (see also bytes)
- 
  -  15.1. Building Character (Programming Perl)
- treating Unicode strings as:  1.10.1. Problem (Perl Cookbook)
 
- ODBC Extension:  24. ODBC Extension for Win32 (Perl in a Nutshell)
- ODBM_File module:  8.166. ODBM_File (Perl in a Nutshell)
- offsets: Glossary (Programming Perl)
- 
  
  - for m// successes:  29.2.112. pos (Programming Perl)
- read function and:  29.2.120. read (Programming Perl)
- seek function:  29.2.138. seek (Programming Perl)
 
- -offvalue option
- 
  
  - Checkbutton widget:  21.5. The Checkbutton Widget (Perl in a Nutshell)
- Menubutton widget:  21.14.1. Menu Item Options (Perl in a Nutshell)
 
- $OFMT ($#) variable:  4.4.1. Global Special Variables (Perl in a Nutshell)
- $OFS ($,) variable:  4.4.1. Global Special Variables (Perl in a Nutshell)
- ok function (Test::Simple):  14.2. Writing Tests with Test::Simple (Learning Perl Objects, References and Modules)
- 
  -  14.6. Testing Things That Write to STDOUT and STDERR (Learning Perl Objects, References and Modules)
 
- -ok option (perlbug):  6.6. The perlbug Program (Perl in a Nutshell)
- -okay option (perlbug):  6.6. The perlbug Program (Perl in a Nutshell)
- .old files, renaming to .new files:  13.2. Renaming Files (Learning Perl)
- OLE automation:  23. OLE Automation (Perl in a Nutshell)
- OLE, Perl modules for:  22.1. The CPAN modules Directory (Programming Perl)
- on_action( ) (SOAP::Lite):  14.2.1. SOAP::Lite Methods (Perl in a Nutshell)
- on_debug( ) (SOAP::Lite):  14.2.1. SOAP::Lite Methods (Perl in a Nutshell)
- one-liners:  1.3.1. How to Do It (Programming Perl)
- 
  - Glossary (Programming Perl)
 
- on_fault( ) (SOAP::Lite):  14.2.1. SOAP::Lite Methods (Perl in a Nutshell)
- on_nonserialized( ) (SOAP::Lite):  14.2.1. SOAP::Lite Methods (Perl in a Nutshell)
- O_NONBLOCK option:  7.20.2. Solution (Perl Cookbook)
- -onvalue option
- 
  
  - Checkbutton widget:  21.5. The Checkbutton Widget (Perl in a Nutshell)
- Menubutton widget:  21.14.1. Menu Item Options (Perl in a Nutshell)
 
- OO (object-oriented) modules
- 
  
  - exporting:  13.3. The Prototype Module Itself (Learning Perl Objects, References and Modules)
- exporting and:  12.10. Exporting in a Primarily OO Module (Learning Perl Objects, References and Modules)
- non-OO versus:  12.5. The Differences Between OO and Non-OO Modules (Learning Perl Objects, References and Modules)
- Test::More module:  14.3. Writing Tests with Test::More (Learning Perl Objects, References and Modules)
 
- OO (object-oriented) programming:  B.20.2. Object-Oriented Programming (Learning Perl)
- OOP (object-oriented programming)
- 
  
  - File::Spec module:  12.3. Sample Object-Oriented Interface: File::Spec (Learning Perl Objects, References and Modules)
- inheritance structures and:  A.7.2. Exercise 2 (Section 8.11.2) (Learning Perl Objects, References and Modules)
- overview:  8. Introduction to Objects (Learning Perl Objects, References and Modules)
- versus non-OOP:  12.5. The Differences Between OO and Non-OO Modules (Learning Perl Objects, References and Modules)
 
- Opcode module:  8.167. Opcode (Perl in a Nutshell)
- 
  -  32.1.12. Authentication, Security, and Encryption (Programming Perl)
 
- opcodes:  18.2. Compiling Your Code (Programming Perl)
- 
  -  18.3. Executing Your Code (Programming Perl)
-  21.1. How Perl Works (Programming Perl)
 
- open( ):  5. Function Reference (Perl in a Nutshell)
- 
  
  - DirHandle module:  8.59. DirHandle (Perl in a Nutshell)
- Mail::Folder module:  16.2.3. Handle Folders with Mail::Folder (Perl in a Nutshell)
- Mail::Mailer module:  16.2.1. Send Email with Mail::Mailer (Perl in a Nutshell)
- Mail::Send module:  16.2.2. Better Header Control with Mail::Send (Perl in a Nutshell)
- 
    -  16.2.2. Better Header Control with Mail::Send (Perl in a Nutshell)
 
- PerlIO:  4.9.1. Perl 5.8 and PerlIO (Perl in a Nutshell)
- Win32::Mutex module:  22.9. Win32::Mutex (Perl in a Nutshell)
- Win32::Semaphore module:  22.16. Win32::Semaphore (Perl in a Nutshell)
-  16.10.3. Discussion (Perl Cookbook)
- (see also processes)
- caching open filehandles:  7.7.2. Solution (Perl Cookbook)
- creating temporary files:  7.11.3. Discussion (Perl Cookbook)
- file access modes:  7.. I/O Operations (Perl Cookbook)
- file descriptors, creating aliases for:  7.10.3. Discussion (Perl Cookbook)
- filehandles:  7.1.2. Solution (Perl Cookbook)
- 
    
    - storing in variables:  7.5.2. Solution (Perl Cookbook)
 
- filtering output:  16.5.2. Solution (Perl Cookbook)
- magic open:  8.25. Program: tctee (Perl Cookbook)
- reading from other programs:  16.4.2. Solution (Perl Cookbook)
- unusual filenames:  7.2.2. Solution (Perl Cookbook)
-  16.3. Fixed-length Random-access Databases (Learning Perl)
-  1.4. Filehandles (Programming Perl)
-  16.3.1. Anonymous Pipes (Programming Perl)
-  29.2.104. open (Programming Perl)
- converting file descriptor to filehandle:  16.2.2. Passing Filehandles  (Programming Perl)
- $. and:  29.2.16. close (Programming Perl)
- fileno function and:  29.2.38. fileno (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, avoiding shell with:  23.3.2. Code Masquerading as Data (Programming Perl)
 
- piped (two-argument form):  29.2.104. open (Programming Perl)
- for pipes, security risks posed by:  23.1.2. Cleaning Up Your Environment (Programming Perl)
- pipes, opening with:  16.3.1. Anonymous Pipes (Programming Perl)
- portability of:  25.5. Interprocess Communication (IPC) (Programming Perl)
 
- Open2, Open3 library modules:  16.3.3. Bidirectional Communication  (Programming Perl)
- open operator:  11.2. Opening a Filehandle (Learning Perl)
- open pragma:  8.19.2. Solution (Perl Cookbook)
- open source software: Glossary (Programming Perl)
- Open( ) (Win32::Registry):  22.15. Win32::Registry (Perl in a Nutshell)
- opendir( ):  5. Function Reference (Perl in a Nutshell)
- 
-  9.5.2. Solution (Perl Cookbook)
- globbing:  9.6.3. Discussion (Perl Cookbook)
- readdir( ):  9.. Introduction (Perl Cookbook)
-  29.2.105. opendir (Programming Perl)
-  12.4. Directory Handles (Learning Perl)
 
- opening
- 
  
  - file descriptors:  7.9.1. Problem (Perl Cookbook)
- files:  7.1.1. Problem (Perl Cookbook)
- files via low-level system call:  29.2.171. sysopen (Programming Perl)
- sockets:  29.2.157. socket (Programming Perl)
 
- OpenLDAP:  19. Lightweight Directory Access with Net::LDAP (Perl in a Nutshell)
- OpenRequest( ) (Win32::Internet):  22.7.3. HTTP Functions (Perl in a Nutshell)
- OpenSSL libraries:  20.16.3. Discussion (Perl Cookbook)
- OpenURL( ) (Win32::Internet):  22.7.1. General Internet Methods (Perl in a Nutshell)
- operand stack:  18.3. Executing Your Code (Programming Perl)
- operating system:  0.1. The Pursuit of Happiness (Programming Perl)
- operating system name:  28.2. Special Variables in Alphabetical Order (Programming Perl)
- operating systems: Glossary (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,
  
  contexts, evaluation in:  2.7.1. Scalar and List Context (Programming Perl)
- operator:  2.8. Getting User Input (Learning Perl)
- 
  
  - context and:  3.9. <STDIN> in List Context (Learning Perl)
- defined function and:  2.12. The defined Function (Learning Perl)
- while loop shortcut and:  6.1. Input from Standard Input (Learning Perl)
 
- operator precedence (see precedence)
- operators:  4.5. Operators (Perl in a Nutshell)
- 
  -  1.5. Operators (Programming Perl)
-  3. Unary and Binary Operators (Programming Perl)
- Glossary (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 and:  2.6.2. Operator Precedence and Associativity (Learning Perl)
- associativity of:  3. Unary and Binary Operators (Programming Perl)
- C language, missing in Perl:  3.21. C Operators Missing from Perl (Programming Perl)
- comparison:  2.6.3. Comparison Operators (Learning Perl)
- 
    -  15.4. Advanced Sorting (Learning Perl)
 
- line input:  7.. I/O Operations (Perl Cookbook)
- 
    -  8.. Basic Operations (Perl Cookbook)
 
- logical operators:  1.5.5. Logical Operators (Programming Perl)
- matching and substitution:  5. Pattern Matching (Programming Perl)
- numeric:  2.2.5. Numeric Operators (Learning Perl)
- overload module for:  B.22. Operator Overloading (Learning Perl)
- overloadable:  13.3. Overloadable Operators (Programming Perl)
- 
    - Glossary (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:  13.14.1. Problem (Perl Cookbook)
- 
    -  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)
- 
    
    - modifiers for:  5.2.1. Pattern Modifiers (Programming Perl)
 
- perlfunc manpage and:  B.8. Other Operators and Functions (Learning Perl)
- perlop manpage and:  B.8. Other Operators and Functions (Learning Perl)
- positions or lengths, switching to character positions:  15.2. Effects of Character Semantics (Programming Perl)
- precedence and:  2.6.2. Operator Precedence and Associativity (Learning Perl)
- precedence of:  1.5.1. Some Binary Arithmetic Operators (Programming Perl)
- 
    -  3. Unary and Binary Operators (Programming Perl)
- C precedence, retaining in Perl:  3. Unary and Binary 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)
 
- operators, for loop control:  4.4.4. Loop Control (Programming Perl)
- ops module:  8.168. ops (Perl in a Nutshell)
- 
  -  32.1.12. Authentication, Security, and Encryption (Programming Perl)
 
- optimizing
- 
  
  - in the Perl compiler:  18.2. Compiling Your Code (Programming Perl)
- performance and:  24.2. Efficiency (Programming Perl)
 
- option modifiers:  9.2. Option Modifiers (Learning Perl)
- option processing,
  
  Perl modules for:  32.1.3. Option, Argument, Parameter, and Configuration
File Processing (Programming Perl)
- option processing, Perl modules for:  22.1. The CPAN modules Directory (Programming Perl)
- Optionmenu widget (Perl/Tk):  21.16. The Optionmenu Widget (Perl in a Nutshell)
- options (see switches, command-line)
- 
  -  19.1.3. Switches (Programming Perl)
 
- -options option (Optionmenu):  21.16. The Optionmenu Widget (Perl in a Nutshell)
- OR (||) operator:  3.14. C-Style Logical (Short-Circuit) Operators (Programming Perl)
- 
  
-  4.5.9. Logical Operators (Perl in a Nutshell)
- list operators and:  4.7. Global Declarations (Programming Perl)
-  10.9. Logical Operators (Learning Perl)
-  10.9.3. Control Structures Using Partial-Evaluation Operators (Learning Perl)
- die function and:  11.3. Fatal Errors with die (Learning Perl)
 
- OR (|) operator, bitwise:  4.5.10. Bitwise Operators (Perl in a Nutshell)
- OR functionality in regular expressions:  6.18.1. Problem (Perl Cookbook)
- OR logical operator:  1.5.5. Logical Operators (Programming Perl)
- or operator:  3.14. C-Style Logical (Short-Circuit) Operators (Programming Perl)
- 
  -  3.20. Logical and, or, not, and xor (Programming Perl)
-  5.9.1. Letting Perl Do the Work (Programming Perl)
-  24.3. Programming with Style (Programming Perl)
- | (bitwise):  3.13. Bitwise Operators (Programming Perl)
- list operators, use with:  4.7. Global Declarations (Programming Perl)
- precedence, or vs. ||:  12.3.3. Syntactic Snafus with Indirect Objects (Programming Perl)
 
- or operator, vs. || operator:  1.2.3. Discussion (Perl Cookbook)
- or (OR) operator:  4.5.9. Logical Operators (Perl in a Nutshell)
- oraperl package:  12.2. Design of DBI (Perl in a Nutshell)
- ord( ):  5. Function Reference (Perl in a Nutshell)
- 
-  1.4.3. Discussion (Perl Cookbook)
-  15.2. Effects of Character Semantics (Programming Perl)
-  29.2.106. ord (Programming Perl)
 
- order (see precedence)
- 
  
  - of function precedence:  29. Functions (Programming Perl)
 
- ordered lists:  3. Introduction to References (Learning Perl Objects, References and Modules)
- -orient option
- 
  
  - Scale widget:  21.13. The Scale Widget (Perl in a Nutshell)
- Scrollbar widget:  21.9. The Scrollbar Widget (Perl in a Nutshell)
 
- ornaments option (debugger):  20.3.3. Debugger Options (Programming Perl)
- $ORS ($\) variable:  4.4.1. Global Special Variables (Perl in a Nutshell)
- OS/2 operating system
- 
  
  - invoking Perl applications on:  19.1.1. #! and Quoting on Non-Unix Systems (Programming Perl)
 
- OSBC
- 
  
  - Perl modules for:  22.1. The CPAN modules Directory (Programming Perl)
 
- $OS_ERROR:  28.2. Special Variables in Alphabetical Order (Programming Perl)
- $OS_ERROR ($!) variable:  4.4.1. Global Special Variables (Perl in a Nutshell)
- $OSNAME (see $^O variable)
- 
  -  28.2. Special Variables in Alphabetical Order (Programming Perl)
 
- $OSNAME ($^O) variable:  4.4.1. Global Special Variables (Perl in a Nutshell)
- our( ):  5. Function Reference (Perl in a Nutshell)
- our declarations:  2.5.1. Name Lookups (Programming Perl)
- 
  -  4. Statements and Declarations (Programming Perl)
-  29.2.107. our (Programming Perl)
- context rules and:  2.7.1. Scalar and List Context (Programming Perl)
- global variables, lexically scoped:  4.8.3. Lexically Scoped Global Declarations: our (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)
 
- our variables:  8.5. A Few Notes About @ISA (Learning Perl Objects, References and Modules)
- out of memory errors:  28.2. Special Variables in Alphabetical Order (Programming Perl)
- outer( ):  10.16.3. Discussion (Perl Cookbook)
- outlaw $_ program:  13.15.4. Tie Example: Outlaw $_ (Perl Cookbook)
- outline programs:  11.16. Program: Outlines (Perl Cookbook)
- output:  6.4. Output to Standard Output (Learning Perl)
- 
  -  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)
- buffered:  6.4. Output to Standard Output (Learning Perl)
- capturing using backquotes:  14.4. Using Backquotes to Capture Output (Learning Perl)
- checking file descriptors for:  29.2.141. select (ready file descriptors) (Programming Perl)
- controlling decimal places:  13.14.5. Example: Overloaded FixNum Class (Perl Cookbook)
- controlling for other programs:  16.8.1. Problem (Perl Cookbook)
- currently selected channel: Glossary (Programming Perl)
- debugger, setting:  20.4. Unattended Execution (Programming Perl)
- field separator (see $, variable)
- files, open mode for:  29.2.104. open (Programming Perl)
- filtering:  16.5.1. Problem (Perl Cookbook)
- flushing:  7.19.1. Problem (Perl Cookbook)
- format output accumulator:  29.2.42. formline (Programming Perl)
- formats for:  4.12. Formats (Perl in a Nutshell)
- formatted with printf function:  6.5. Formatted Output with printf (Learning Perl)
- functions dealing with:  29.1. Perl Functions by Category (Programming Perl)
- gathering from programs:  16.1.1. Problem (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:  8.12.1. Problem (Perl Cookbook)
- record separator (see $\ variable)
- selecting filehandles for:  29.2.140. select (output filehandle) (Programming Perl)
- writing to other programs:  16.4.1. Problem (Perl Cookbook)
- XSUBs:  21.3.3. XSUB Input and Output (Programming Perl)
 
- output( ):  5.17. Program: dutree (Perl Cookbook)
- output filehandles:  1.4. Filehandles (Programming Perl)
- output filehandles;STDOUT:  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:  4.4.6. Filehandle Special Variables (Perl in a Nutshell)
- OutputCP( ) (Win32::Console):  22.2. Win32::Console (Perl in a Nutshell)
- output_fh( ):  22.7.3. Discussion (Perl Cookbook)
- $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_file( ):  22.7.3. Discussion (Perl Cookbook)
- $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)
- outputxml( ) (SOAP::Lite):  14.2.1. SOAP::Lite Methods (Perl in a Nutshell)
- =over command (pod):  4.13.1. Paragraph Tags (Perl in a Nutshell)
- overloading
  
 mathematical functions:  13.3. Overloadable Operators (Programming Perl)
- overload handlers:  13.2. Overload Handlers (Programming Perl)
- overload module:  B.22. Operator Overloading (Learning Perl)
- 
  -  8.169. 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:  3. Unary and Binary Operators (Programming Perl)
- 
  -  13. Overloading (Programming Perl)
- Glossary (Programming Perl)
- autogeneration of:  13.3. Overloadable Operators (Programming Perl)
- circular references, avoiding:  13.3. Overloadable Operators (Programming Perl)
- constants:  13.6. Overloading Constants (Programming Perl)
- copy constructor (=):  13.4. The Copy Constructor (=) (Programming Perl)
- diagnostics:  13.10. Overloading Diagnostics (Programming Perl)
- functions for:  13.7. Public Overload Functions (Programming Perl)
- inheritance and:  13.8. Inheritance and Overloading (Programming Perl)
- nonmethod and fallback:  13.5. When an Overload Handler Is Missing (nomethod and fallback) (Programming Perl)
- overload module:  32.1.1. Data Types (Programming Perl)
- overload pragma:  13.1. The overload Pragma (Programming Perl)
- overloadable operators:  13.3. Overloadable Operators (Programming Perl)
- at run time:  13.9. Run-Time Overloading (Programming Perl)
- sorting and:  13.3. Overloadable Operators (Programming Perl)
- stringifying:  14.4.1. Filehandle-Tying Methods (Programming Perl)
 
- overloading, autogeneration of:  13.3. Overloadable Operators (Programming Perl)
- overloading operators:  13.14.1. Problem (Perl Cookbook)
- overridden methods:  13.11.1. Problem (Perl Cookbook)
- overridden methods, base class, invoking all:  12.5.3. UNIVERSAL: The Ultimate Ancestor Class (Programming Perl)
- overridedirect( ) (Frame widget):  21.18.1. Toplevel Methods (Perl in a Nutshell)
- overriding
- 
  
  - base class methods:  12.5.2. Accessing Overridden Methods (Programming Perl)
- built-in functions:  12.12.1. Problem (Perl Cookbook)
- functions:  11.3. Overriding Built-in Functions (Programming Perl)
- methods:  8.6. Overriding the Methods (Learning Perl Objects, References and Modules)
- signal handlers:  16.16.1. Problem (Perl Cookbook)
- superclass methods:  10.2. Beating a Dead Horse (Learning Perl Objects, References and Modules)
- 
    -  10.2. Beating a Dead Horse (Learning Perl Objects, References and Modules)
 
- UNIVERSAL class methods:  11.1. UNIVERSAL Methods (Learning Perl Objects, References and Modules)
 
- overview_fmt( ) (Net::NNTP):  17.2.2. Net::NNTP Reference (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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