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 | Explanatory note

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

object (see constructors)

classes : Packages, Modules, and Object Classes

constructors (see 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 (see $# variable)

a2p

$OFS (see $, variable)

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 (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

Programming with Style

ord function : ord

order (see precedence)

of function precedence : Functions

$ORS (see $\ variable)

$OSNAME (see $^O variable)

$OS_ERROR (see $! variable)

output (see also filehandles)

checking file descriptors for : select (ready file descriptors)

field separator (see $, variable)

pipes : Pipes

record separator (see $\ variable)

selecting filehandles for : select (output filehandle)

test script : The test script output

$OUTPUT_AUTOFLUSH (see $| variable)

$OUTPUT_FIELD_SEPARATOR (see $, variable)

$OUTPUT_RECORD_SEPARATOR (see $\ variable)

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

ownership, file : chown

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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
Explanatory note

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