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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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