O
- o command (CPAN.pm), o
- O command (Perl debugger), O
- -o file test operator, File Test Operators
- -O file test operator, File Test Operators
- O module, O
- -O option (dprofpp), The Perl Profiler
- -o option (perlcc), The Perl Compiler
- o pattern match modifier, Pattern-Matching Operators
- object-oriented programming, Object-Oriented Perl
- objects, Perl Functions by Category, Object-Oriented Perl, Object Syntax
- functions for, Perl Functions by Category
- instance vs. class methods, Object Syntax
- Objects style (XML\:\:Parser), XML::Parser Styles
- obtaining Perl modules, How Is CPAN Organized?, Getting and Installing Modules–Locating Modules
- obtaining Perl source code, Installing Perl
- oct(), oct
- ODBC Extension, ODBC Extension for Win32
- ODBM_File module, ODBM_File
- -offvalue option, The Checkbutton Widget, Menu Item Options
- Checkbutton widget, The Checkbutton Widget
- Menubutton widget, Menu Item Options
- $OFMT ($#) variable, Global Special Variables
- $OFS ($,) variable, Global Special Variables
- -ok option (perlbug), The perlbug Program
- -okay option (perlbug), The perlbug Program
- OLE automation, OLE Automation–Win32::OLE::Const
- -onvalue option, The Checkbutton Widget, Menu Item Options
- Checkbutton widget, The Checkbutton Widget
- Menubutton widget, Menu Item Options
- on_action() (SOAP\:\:Lite), SOAP::Lite Methods
- on_debug() (SOAP\:\:Lite), SOAP::Lite Methods
- on_fault() (SOAP\:\:Lite), SOAP::Lite Methods
- on_nonserialized() (SOAP\:\:Lite), SOAP::Lite Methods
- Opcode module, Opcode
- open(), open, open, Better Header Control with Mail::Send ...
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