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Index: O

for m// successes : 3.2.109. pos
read function and : 3.2.116. read
seek function : 3.2.132. seek

OFMT : 6.4.2.2. a2p

$OFMT : (see $ variables, $# variable)

$OFS : (see $ variables, $, variable)

one-liners : 1.3.1. How to Do It

OOP (object-oriented programming)

5.3.1. Brief Refresher on Object-Oriented Programming
5.5.1. Object-Oriented Scaling Tips

open function

3.2.102. open
6.2.2.1. Anonymous pipes
$. and : 3.2.18. close
fileno function and : 3.2.38. fileno

open() : 7.2.33. FileHandle - Supply Object Methods for Filehandles

open2() : 7.2.39. IPC::Open2 - Open a Process for Both Reading and Writing

Open2, Open3 library modules : 6.2.2.3. Bidirectional communication

open3() : 7.2.40. IPC::Open3 - Open a Process for Reading, Writing, and Error Handling

opendir function

3.2.103. opendir
7.2.11. DirHandle - Supply Object Methods for Directory Handles

opening

files

FileCache module : 7.2.32. FileCache - Keep More Files Open Than the System Permits
via low-level system call : 3.2.165. sysopen

sockets : 3.2.151. socket

openlog() : 7.2.63. Sys::Syslog - Perl Interface to UNIX syslog(3) Calls

operating system : Perl in a Nutshell

operator mask : 7.2.51. Safe - Create Safe Namespaces for Evaluating Perl Code

operators

1.5. Operators
2.5. Operators
associativity of : 2.5. Operators
autogeneration : 7.2.48.7. Autogeneration
overloading : 7.2.48. overload - Overload Perl's Mathematical Operations
precedence of : 2.5. Operators

optimizing, performance and : 8.3. Efficiency

options : (see switches, Perl command-line)

OR (^) operator

(see XOR operator)
8.2.3. Awk Traps

OR (|) operator : 2.5.13. Bitwise Operators

OR (||) operator : 2.5.14. C-style Logical (Short Circuit) Operators

or operator

2.5.20. Logical and, or, not, and xor
8.4. Programming with Style

ord function : 3.2.104. ord

order : (see precedence)

of function precedence : 3. Functions

$ORS : (see $ variables, $\ variable)

$OS_ERROR : (see $ variables, $! variable)

$OSNAME : (see $ variables, $^O variable)

output

(see also filehandles)
1.4. Filehandles
checking file descriptors for : 3.2.135. select (ready file descriptors)
field separator : (see $ variables, $, variable)
pipes : 6.2.2. Pipes
record separator : (see $ variables, $\ variable)
selecting filehandles for : 3.2.134. select (output filehandle)
test script : 7.2.66.1. The test script output

$OUTPUT_AUTOFLUSH : (see $ variables, $| variable)

$OUTPUT_FIELD_SEPARATOR : (see $ variables, $, variable)

$OUTPUT_RECORD_SEPARATOR : (see $ variables, $\ variable)

overload module : 7.2.48. overload - Overload Perl's Mathematical Operations

Overloaded() : 7.2.48.9. Public functions

overloading

functions : 2.3.3.1. Scalar and list context
run-time : 7.2.48.8. Run-time overloading

overriding

base class methods : 5.5.6. Overriding Base Class Methods
functions : 5.2.2. Overriding Built-in Functions
MakeMaker methods : 7.2.18.10. Overriding MakeMaker methods

ownership, file : 3.2.15. chown

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