Initial Commit
This commit is contained in:
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database/perl/lib/pods/perl.pod
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443
database/perl/lib/pods/perl.pod
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=head1 NAME
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perl - The Perl 5 language interpreter
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=head1 SYNOPSIS
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B<perl> S<[ B<-sTtuUWX> ]>
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S<[ B<-hv> ] [ B<-V>[:I<configvar>] ]>
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S<[ B<-cw> ] [ B<-d>[B<t>][:I<debugger>] ] [ B<-D>[I<number/list>] ]>
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S<[ B<-pna> ] [ B<-F>I<pattern> ] [ B<-l>[I<octal>] ] [ B<-0>[I<octal/hexadecimal>] ]>
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S<[ B<-I>I<dir> ] [ B<-m>[B<->]I<module> ] [ B<-M>[B<->]I<'module...'> ] [ B<-f> ]>
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S<[ B<-C [I<number/list>] >]>
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S<[ B<-S> ]>
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S<[ B<-x>[I<dir>] ]>
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S<[ B<-i>[I<extension>] ]>
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S<[ [B<-e>|B<-E>] I<'command'> ] [ B<--> ] [ I<programfile> ] [ I<argument> ]...>
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For more information on these options, you can run C<perldoc perlrun>.
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=head1 GETTING HELP
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The F<perldoc> program gives you access to all the documentation that comes
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with Perl. You can get more documentation, tutorials and community support
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online at L<https://www.perl.org/>.
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If you're new to Perl, you should start by running C<perldoc perlintro>,
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which is a general intro for beginners and provides some background to help
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you navigate the rest of Perl's extensive documentation. Run C<perldoc
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perldoc> to learn more things you can do with F<perldoc>.
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For ease of access, the Perl manual has been split up into several sections.
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=begin buildtoc
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# This section is parsed by Porting/pod_lib.pl for use by pod/buildtoc etc
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flag =g perluniprops perlmodlib perlapi perlintern
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flag =go perltoc
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flag =ro perlcn perljp perlko perltw
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flag = perlvms
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path perlfaq.* cpan/perlfaq/lib/
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path perlglossary cpan/perlfaq/lib/
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path perlxs(?:tut|typemap)? dist/ExtUtils-ParseXS/lib/
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path perldoc cpan/Pod-Perldoc/
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aux h2ph h2xs perlbug pl2pm pod2html pod2man splain xsubpp
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=end buildtoc
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=head2 Overview
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perl Perl overview (this section)
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perlintro Perl introduction for beginners
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perlrun Perl execution and options
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perltoc Perl documentation table of contents
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=head2 Tutorials
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perlreftut Perl references short introduction
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perldsc Perl data structures intro
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perllol Perl data structures: arrays of arrays
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perlrequick Perl regular expressions quick start
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perlretut Perl regular expressions tutorial
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perlootut Perl OO tutorial for beginners
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perlperf Perl Performance and Optimization Techniques
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perlstyle Perl style guide
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perlcheat Perl cheat sheet
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perltrap Perl traps for the unwary
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perldebtut Perl debugging tutorial
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perlfaq Perl frequently asked questions
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perlfaq1 General Questions About Perl
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perlfaq2 Obtaining and Learning about Perl
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perlfaq3 Programming Tools
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perlfaq4 Data Manipulation
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perlfaq5 Files and Formats
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perlfaq6 Regexes
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perlfaq7 Perl Language Issues
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perlfaq8 System Interaction
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perlfaq9 Networking
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=head2 Reference Manual
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perlsyn Perl syntax
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perldata Perl data structures
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perlop Perl operators and precedence
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perlsub Perl subroutines
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perlfunc Perl built-in functions
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perlopentut Perl open() tutorial
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perlpacktut Perl pack() and unpack() tutorial
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perlpod Perl plain old documentation
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perlpodspec Perl plain old documentation format specification
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perlpodstyle Perl POD style guide
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perldiag Perl diagnostic messages
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perldeprecation Perl deprecations
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perllexwarn Perl warnings and their control
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perldebug Perl debugging
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perlvar Perl predefined variables
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perlre Perl regular expressions, the rest of the story
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perlrebackslash Perl regular expression backslash sequences
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perlrecharclass Perl regular expression character classes
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perlreref Perl regular expressions quick reference
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perlref Perl references, the rest of the story
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perlform Perl formats
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perlobj Perl objects
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perltie Perl objects hidden behind simple variables
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perldbmfilter Perl DBM filters
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perlipc Perl interprocess communication
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perlfork Perl fork() information
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perlnumber Perl number semantics
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perlthrtut Perl threads tutorial
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perlport Perl portability guide
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perllocale Perl locale support
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perluniintro Perl Unicode introduction
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perlunicode Perl Unicode support
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perlunicook Perl Unicode cookbook
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perlunifaq Perl Unicode FAQ
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perluniprops Index of Unicode properties in Perl
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perlunitut Perl Unicode tutorial
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perlebcdic Considerations for running Perl on EBCDIC platforms
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perlsec Perl security
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perlsecpolicy Perl security report handling policy
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perlmod Perl modules: how they work
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perlmodlib Perl modules: how to write and use
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perlmodstyle Perl modules: how to write modules with style
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perlmodinstall Perl modules: how to install from CPAN
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perlnewmod Perl modules: preparing a new module for distribution
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perlpragma Perl modules: writing a user pragma
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perlutil utilities packaged with the Perl distribution
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perlfilter Perl source filters
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perldtrace Perl's support for DTrace
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perlglossary Perl Glossary
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=head2 Internals and C Language Interface
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perlembed Perl ways to embed perl in your C or C++ application
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perldebguts Perl debugging guts and tips
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perlxstut Perl XS tutorial
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perlxs Perl XS application programming interface
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perlxstypemap Perl XS C/Perl type conversion tools
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perlclib Internal replacements for standard C library functions
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perlguts Perl internal functions for those doing extensions
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perlcall Perl calling conventions from C
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perlmroapi Perl method resolution plugin interface
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perlreapi Perl regular expression plugin interface
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perlreguts Perl regular expression engine internals
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perlapi Perl API listing (autogenerated)
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perlintern Perl internal functions (autogenerated)
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perliol C API for Perl's implementation of IO in Layers
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perlapio Perl internal IO abstraction interface
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perlhack Perl hackers guide
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perlsource Guide to the Perl source tree
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perlinterp Overview of the Perl interpreter source and how it works
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perlhacktut Walk through the creation of a simple C code patch
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perlhacktips Tips for Perl core C code hacking
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perlpolicy Perl development policies
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perlgov Perl Rules of Governance
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perlgit Using git with the Perl repository
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=head2 Miscellaneous
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perlbook Perl book information
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perlcommunity Perl community information
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perldoc Look up Perl documentation in Pod format
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perlhist Perl history records
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perldelta Perl changes since previous version
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perl5320delta Perl changes in version 5.32.0
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perl5303delta Perl changes in version 5.30.3
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perl5302delta Perl changes in version 5.30.2
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perl5301delta Perl changes in version 5.30.1
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perl5300delta Perl changes in version 5.30.0
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perl5283delta Perl changes in version 5.28.3
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perl5282delta Perl changes in version 5.28.2
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perl5281delta Perl changes in version 5.28.1
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perl5280delta Perl changes in version 5.28.0
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perl5263delta Perl changes in version 5.26.3
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perl5262delta Perl changes in version 5.26.2
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perl5261delta Perl changes in version 5.26.1
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perl5260delta Perl changes in version 5.26.0
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perl5244delta Perl changes in version 5.24.4
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perl5243delta Perl changes in version 5.24.3
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perl5242delta Perl changes in version 5.24.2
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perl5241delta Perl changes in version 5.24.1
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perl5240delta Perl changes in version 5.24.0
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perl5224delta Perl changes in version 5.22.4
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perl5223delta Perl changes in version 5.22.3
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perl5222delta Perl changes in version 5.22.2
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perl5221delta Perl changes in version 5.22.1
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perl5220delta Perl changes in version 5.22.0
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perl5203delta Perl changes in version 5.20.3
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perl5202delta Perl changes in version 5.20.2
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perl5201delta Perl changes in version 5.20.1
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perl5200delta Perl changes in version 5.20.0
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perl5184delta Perl changes in version 5.18.4
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perl5182delta Perl changes in version 5.18.2
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perl5181delta Perl changes in version 5.18.1
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perl5180delta Perl changes in version 5.18.0
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perl5163delta Perl changes in version 5.16.3
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perl5162delta Perl changes in version 5.16.2
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perl5161delta Perl changes in version 5.16.1
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perl5160delta Perl changes in version 5.16.0
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perl5144delta Perl changes in version 5.14.4
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perl5143delta Perl changes in version 5.14.3
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perl5142delta Perl changes in version 5.14.2
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perl5141delta Perl changes in version 5.14.1
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perl5140delta Perl changes in version 5.14.0
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perl5125delta Perl changes in version 5.12.5
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perl5124delta Perl changes in version 5.12.4
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perl5123delta Perl changes in version 5.12.3
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perl5122delta Perl changes in version 5.12.2
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perl5121delta Perl changes in version 5.12.1
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perl5120delta Perl changes in version 5.12.0
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perl5101delta Perl changes in version 5.10.1
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perl5100delta Perl changes in version 5.10.0
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perl589delta Perl changes in version 5.8.9
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perl588delta Perl changes in version 5.8.8
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perl587delta Perl changes in version 5.8.7
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perl586delta Perl changes in version 5.8.6
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perl585delta Perl changes in version 5.8.5
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perl584delta Perl changes in version 5.8.4
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perl583delta Perl changes in version 5.8.3
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perl582delta Perl changes in version 5.8.2
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perl581delta Perl changes in version 5.8.1
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perl58delta Perl changes in version 5.8.0
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perl561delta Perl changes in version 5.6.1
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perl56delta Perl changes in version 5.6
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perl5005delta Perl changes in version 5.005
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perl5004delta Perl changes in version 5.004
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perlexperiment A listing of experimental features in Perl
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perlartistic Perl Artistic License
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perlgpl GNU General Public License
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=head2 Language-Specific
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=for buildtoc flag +r
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perlcn Perl for Simplified Chinese (in EUC-CN)
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perljp Perl for Japanese (in EUC-JP)
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perlko Perl for Korean (in EUC-KR)
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perltw Perl for Traditional Chinese (in Big5)
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=head2 Platform-Specific
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perlaix Perl notes for AIX
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perlamiga Perl notes for AmigaOS
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perlandroid Perl notes for Android
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perlbs2000 Perl notes for POSIX-BC BS2000
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perlcygwin Perl notes for Cygwin
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perldos Perl notes for DOS
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perlfreebsd Perl notes for FreeBSD
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perlhaiku Perl notes for Haiku
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perlhpux Perl notes for HP-UX
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perlhurd Perl notes for Hurd
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perlirix Perl notes for Irix
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perllinux Perl notes for Linux
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perlmacos Perl notes for Mac OS (Classic)
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perlmacosx Perl notes for Mac OS X
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perlnetware Perl notes for NetWare
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perlopenbsd Perl notes for OpenBSD
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perlos2 Perl notes for OS/2
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perlos390 Perl notes for OS/390
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perlos400 Perl notes for OS/400
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perlplan9 Perl notes for Plan 9
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perlqnx Perl notes for QNX
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perlriscos Perl notes for RISC OS
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perlsolaris Perl notes for Solaris
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perlsymbian Perl notes for Symbian
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perlsynology Perl notes for Synology
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perltru64 Perl notes for Tru64
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perlvms Perl notes for VMS
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perlvos Perl notes for Stratus VOS
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perlwin32 Perl notes for Windows
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=for buildtoc flag -r
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=head2 Stubs for Deleted Documents
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perlboot
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perlbot
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perlrepository
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perltodo
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perltooc
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perltoot
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=for buildtoc __END__
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On a Unix-like system, these documentation files will usually also be
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available as manpages for use with the F<man> program.
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Some documentation is not available as man pages, so if a
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cross-reference is not found by man, try it with L<perldoc>. Perldoc can
|
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also take you directly to documentation for functions (with the B<-f>
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switch). See C<perldoc --help> (or C<perldoc perldoc> or C<man perldoc>)
|
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for other helpful options L<perldoc> has to offer.
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In general, if something strange has gone wrong with your program and you're
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not sure where you should look for help, try making your code comply with
|
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B<use strict> and B<use warnings>. These will often point out exactly
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where the trouble is.
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=head1 DESCRIPTION
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Perl officially stands for Practical Extraction and Report Language,
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except when it doesn't.
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Perl was originally a language optimized for scanning arbitrary
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text files, extracting information from those text files, and printing
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reports based on that information. It quickly became a good language
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for many system management tasks. Over the years, Perl has grown into
|
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a general-purpose programming language. It's widely used for everything
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from quick "one-liners" to full-scale application development.
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The language is intended to be practical (easy to use, efficient,
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complete) rather than beautiful (tiny, elegant, minimal). It combines
|
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(in the author's opinion, anyway) some of the best features of B<sed>,
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B<awk>, and B<sh>, making it familiar and easy to use for Unix users to
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whip up quick solutions to annoying problems. Its general-purpose
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programming facilities support procedural, functional, and
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object-oriented programming paradigms, making Perl a comfortable
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language for the long haul on major projects, whatever your bent.
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Perl's roots in text processing haven't been forgotten over the years.
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It still boasts some of the most powerful regular expressions to be
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found anywhere, and its support for Unicode text is world-class. It
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handles all kinds of structured text, too, through an extensive
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collection of extensions. Those libraries, collected in the CPAN,
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provide ready-made solutions to an astounding array of problems. When
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they haven't set the standard themselves, they steal from the best
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-- just like Perl itself.
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=head1 AVAILABILITY
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Perl is available for most operating systems, including virtually
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all Unix-like platforms. See L<perlport/"Supported Platforms">
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for a listing.
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=head1 ENVIRONMENT
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See L<perlrun/ENVIRONMENT>.
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=head1 AUTHOR
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Larry Wall <larry@wall.org>, with the help of oodles of other folks.
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If your Perl success stories and testimonials may be of help to others
|
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who wish to advocate the use of Perl in their applications,
|
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or if you wish to simply express your gratitude to Larry and the
|
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Perl developers, please write to perl-thanks@perl.org .
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=head1 FILES
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"@INC" locations of perl libraries
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"@INC" above is a reference to the built-in variable of the same name;
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see L<perlvar> for more information.
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=head1 SEE ALSO
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https://www.perl.org/ the Perl homepage
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https://www.perl.com/ Perl articles
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https://www.cpan.org/ the Comprehensive Perl Archive
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https://www.pm.org/ the Perl Mongers
|
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=head1 DIAGNOSTICS
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Using the C<use strict> pragma ensures that all variables are properly
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declared and prevents other misuses of legacy Perl features.
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||||
The C<use warnings> pragma produces some lovely diagnostics. One can
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||||
also use the B<-w> flag, but its use is normally discouraged, because
|
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it gets applied to all executed Perl code, including that not under
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your control.
|
||||
|
||||
See L<perldiag> for explanations of all Perl's diagnostics. The C<use
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diagnostics> pragma automatically turns Perl's normally terse warnings
|
||||
and errors into these longer forms.
|
||||
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||||
Compilation errors will tell you the line number of the error, with an
|
||||
indication of the next token or token type that was to be examined.
|
||||
(In a script passed to Perl via B<-e> switches, each
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B<-e> is counted as one line.)
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||||
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||||
Setuid scripts have additional constraints that can produce error
|
||||
messages such as "Insecure dependency". See L<perlsec>.
|
||||
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||||
Did we mention that you should definitely consider using the B<use warnings>
|
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pragma?
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=head1 BUGS
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||||
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The behavior implied by the B<use warnings> pragma is not mandatory.
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||||
|
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Perl is at the mercy of your machine's definitions of various
|
||||
operations such as type casting, atof(), and floating-point
|
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output with sprintf().
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||||
|
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If your stdio requires a seek or eof between reads and writes on a
|
||||
particular stream, so does Perl. (This doesn't apply to sysread()
|
||||
and syswrite().)
|
||||
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||||
While none of the built-in data types have any arbitrary size limits
|
||||
(apart from memory size), there are still a few arbitrary limits: a
|
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given variable name may not be longer than 251 characters. Line numbers
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displayed by diagnostics are internally stored as short integers,
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so they are limited to a maximum of 65535 (higher numbers usually being
|
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affected by wraparound).
|
||||
|
||||
You may submit your bug reports (be sure to include full configuration
|
||||
information as output by the myconfig program in the perl source
|
||||
tree, or by C<perl -V>) to L<https://github.com/Perl/perl5/issues>.
|
||||
|
||||
Perl actually stands for Pathologically Eclectic Rubbish Lister, but
|
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don't tell anyone I said that.
|
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|
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=head1 NOTES
|
||||
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||||
The Perl motto is "There's more than one way to do it." Divining
|
||||
how many more is left as an exercise to the reader.
|
||||
|
||||
The three principal virtues of a programmer are Laziness,
|
||||
Impatience, and Hubris. See the Camel Book for why.
|
||||
|
||||
Reference in New Issue
Block a user