O

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 Pattern-Matching Operators
object classes : Packages, Modules, and Object Classes constructors : Object Constructors methods : Using Object Methods
object methods : DirHandle--Supply Object Methods for Directory Handles for filehandles : FileHandle--Supply Object Methods for Filehandles
object-oriented programming Brief Refresher on Object-Oriented Programming Object-Oriented Scaling Tips
objects Objects Class Context and the Object blessing : bless
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 Global Special Variables a2p
$OFS : vars--Predeclare Global Variable Names
one-liners : How to Do It
OOP (object-oriented programming) Brief Refresher on Object-Oriented Programming Object-Oriented Scaling Tips
open function open Anonymous pipes fileno function and : fileno $. and : close
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 via low-level system call : sysopen sockets : socket
opening files FileCache module : FileCache--Keep More Files Open Than the System Permits
openlog( ) : Sys::Syslog--Perl Interface to UNIX syslog(3) Calls
operating system : Perl in a Nutshell
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 : Switches
OR (^) operator Bitwise Operators Awk Traps
OR (|) operator : Bitwise Operators
OR (||) operator : C-style Logical (Short Circuit) Operators
or operator Logical and, or, not, and xor Programming with Style
ord function : ord
order : The rules of regular expression matching of function precedence : Functions
$ORS : vars--Predeclare Global Variable Names
$OSNAME : Global Special Variables
$OS_ERROR : vars--Predeclare Global Variable Names
output : Filehandles checking file descriptors for : select (ready file descriptors) field separator : Global Special Variables pipes : Pipes record separator : Global Special Variables selecting filehandles for : select (output filehandle) test script : The test script output
$OUTPUT_AUTOFLUSH : vars--Predeclare Global Variable Names
$OUTPUT_FIELD_SEPARATOR : vars--Predeclare Global Variable Names
$OUTPUT_RECORD_SEPARATOR : vars--Predeclare Global Variable Names
overload module : overload--Overload Perl's Mathematical Operations
overloaded functions : Scalar and list context
Overloaded( ) : Public functions
overloading run-time : Run-time overloading
overriding base class methods : Overriding Base Class Methods MakeMaker methods : Overriding MakeMaker methods
overriding functions : Overriding Built-in Functions
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