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Index: O

command (debugger) : Debugger Commands
-O file test operator : Named Unary and File Test Operators
-o file test operator : Named Unary and File Test Operators
/o modifier : Pattern-Matching Operators
object methods : DirHandle - Supply Object Methods for Directory Handles
- for filehandles : FileHandle - Supply Object Methods for Filehandles
object-oriented developing
- Brief Refresher on Object-Oriented Developing
- Object-Oriented Scaling Tips
objects
- Objects
- Class Context and the Object
- blessing : bless
- classes : Packages, Modules, and Object Classes
- constructors : (see constructors)
- methods : Using Object Methods
obtaining Perl : How to Get Perl
oct function : oct
octal characters : String literals
octal numbers
- The rules of regular expression matching
- oct
- specifying $/ as : Switches
ODBM_File module
- AnyDBM_File - Provide Framework for Multiple DBMs
- ODBM_File - Tied Access to ODBM Files
offsets
- for m// successes : pos
- read function and : read
- seek function : seek
OFMT : p
$OFMT : (see $ variables, $# variable)
$OFS : (see $ variables, $, variable)
one-liners : How to Do It
OOP (object-oriented developing)
- Brief Refresher on Object-Oriented Developing
- Object-Oriented Scaling Tips
open function
- open
- Anonymous pipes
- $. and : close
- fileno function and : fileno
open() : FileHandle - Supply Object Methods for Filehandles
open2() : IPC::Open2 - Open a Process for Both Reading and Writing
Open2, Open3 library modules : Bidirectional communication
open3() : IPC::Open3 - Open a Process for Reading, Writing, and Error Handling
opendir function
- opendir
- DirHandle - Supply Object Methods for Directory Handles
opening
- files
- - FileCache module : FileCache - Keep More Files Open Than the System Permits
  - via low-level system call : sysopen
- sockets : socket
openlog() : Sys::Syslog - Perl Interface to UNIX syslog(3) Calls
operating system : Perl tutorial
operator mask : Safe - Create Safe Namespaces for Evaluating Perl Code
operators
- Operators
- Operators
- associativity of : Operators
- autogeneration : Autogeneration
- overloading : overload - Overload Perl's Mathematical Operations
- precedence of : Operators
optimizing, performance and : Efficiency
options : (see switches, Perl command-line)
OR (^) operator
- (see XOR operator)
- Awk Traps
OR (|) operator : Bitwise Operators
OR (||) operator : C-style Logical (Short Circuit) Operators
or operator
- Logical and, or, not, and xor
- Developing with Style
ord function : ord
order : (see precedence)
- of function precedence : Functions
$ORS : (see $ variables, $\ variable)
$OS_ERROR : (see $ variables, $! variable)
$OSNAME : (see $ variables, $^O variable)
output
- (see also filehandles)
- Filehandles
- checking file descriptors for : select (ready file descriptors)
- field separator : (see $ variables, $, variable)
- pipes : Pipes
- record separator : (see $ variables, $\ variable)
- selecting filehandles for : select (output filehandle)
- test script : The test script output
$OUTPUT_AUTOFLUSH : (see $ variables, $| variable)
$OUTPUT_FIELD_SEPARATOR : (see $ variables, $, variable)
$OUTPUT_RECORD_SEPARATOR : (see $ variables, $\ variable)
overload module : overload - Overload Perl's Mathematical Operations
Overloaded() : Public functions
overloading
- functions : Scalar and list context
- run-time : Run-time overloading
overriding
- base class methods : Overriding Base Class Methods
- functions : Overriding Built-in Functions
- MakeMaker methods : Overriding MakeMaker methods
ownership, file : chown

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