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# Index: O

O command (debugger) : 8.1.1. Debugger Commands
-O file test operator : 2.5.10. Named Unary and File Test Operators
-o file test operator : 2.5.10. Named Unary and File Test Operators
/o modifier : 2.4.2. Pattern-Matching Operators
object methods : 7.2.11. DirHandle - Supply Object Methods for Directory Handles
  for filehandles : 7.2.33. FileHandle - Supply Object Methods for Filehandles
object-oriented programming
  5.3.1. Brief Refresher on Object-Oriented Programming
  5.5.1. Object-Oriented Scaling Tips
objects
  5.3. Objects
  5.5.9. Class Context and the Object
  blessing : 3.2.9. bless
  classes : 5. Packages, Modules, and Object Classes
  constructors : (see constructors)
  methods : 4.3.4. Using Object Methods
obtaining Perl : How to Get Perl
oct function : 3.2.101. oct
octal characters : 2.3.2.2. String literals
octal numbers
  2.4.1.2. The rules of regular expression matching
  3.2.101. oct
  specifying $/ as : 6.1.2. Switches
ODBM_File module
  7.2.1. AnyDBM_File - Provide Framework for Multiple DBMs
  7.2.47. ODBM_File - Tied Access to ODBM Files
offsets
  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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