perlmodlib.pod

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=for maintainers
Generated by perlmodlib.PL -- DO NOT EDIT!

=head1 NAME

perlmodlib - constructing new Perl modules and finding existing ones

=head1 THE PERL MODULE LIBRARY

Many modules are included in the Perl distribution.  These are described
below, and all end in F<.pm>.  You may discover compiled library
files (usually ending in F<.so>) or small pieces of modules to be
autoloaded (ending in F<.al>); these were automatically generated
by the installation process.  You may also discover files in the
library directory that end in either F<.pl> or F<.ph>.  These are
old libraries supplied so that old programs that use them still
run.  The F<.pl> files will all eventually be converted into standard
modules, and the F<.ph> files made by B<h2ph> will probably end up
as extension modules made by B<h2xs>.  (Some F<.ph> values may
already be available through the POSIX, Errno, or Fcntl modules.)
The B<pl2pm> file in the distribution may help in your conversion,
but it's just a mechanical process and therefore far from bulletproof.

=head2 Pragmatic Modules

They work somewhat like compiler directives (pragmata) in that they
tend to affect the compilation of your program, and thus will usually
work well only when used within a C<use>, or C<no>.  Most of these
are lexically scoped, so an inner BLOCK may countermand them
by saying:

    no integer;
    no strict 'refs';
    no warnings;

which lasts until the end of that BLOCK.

Some pragmas are lexically scoped--typically those that affect the
C<$^H> hints variable.  Others affect the current package instead,
like C<use vars> and C<use subs>, which allow you to predeclare a
variables or subroutines within a particular I<file> rather than
just a block.  Such declarations are effective for the entire file
for which they were declared.  You cannot rescind them with C<no
vars> or C<no subs>.

The following pragmas are defined (and have their own documentation).

=over 12

=item attributes

Get/set subroutine or variable attributes

=item attrs

Set/get attributes of a subroutine (deprecated)

=item autouse

Postpone load of modules until a function is used

=item base

Establish an ISA relationship with base classes at compile time

=item bigint

Transparent BigInteger support for Perl

=item bignum

Transparent BigNumber support for Perl

=item bigrat

Transparent BigNumber/BigRational support for Perl

=item blib

Use MakeMaker's uninstalled version of a package

=item bytes

Force byte semantics rather than character semantics

=item charnames

Define character names for C<\N{named}> string literal escapes

=item constant

Declare constants

=item diagnostics

Produce verbose warning diagnostics

=item encoding

Allows you to write your script in non-ascii or non-utf8

=item encoding::warnings

Warn on implicit encoding conversions

=item feature

Enable new syntactic features

=item fields

Compile-time class fields

=item filetest

Control the filetest permission operators

=item if

C<use> a Perl module if a condition holds

=item integer

Use integer arithmetic instead of floating point

=item less

Request less of something

=item lib

Manipulate @INC at compile time

=item locale

Use and avoid POSIX locales for built-in operations

=item mro

Method Resolution Order

=item open

Set default PerlIO layers for input and output

=item ops

Restrict unsafe operations when compiling

=item overload

Package for overloading Perl operations

=item re

Alter regular expression behaviour

=item sigtrap

Enable simple signal handling

=item sort

Control sort() behaviour

=item strict

Restrict unsafe constructs

=item subs

Predeclare sub names

=item threads

Perl interpreter-based threads

=item threads::shared

Perl extension for sharing data structures between threads

=item utf8

Enable/disable UTF-8 (or UTF-EBCDIC) in source code

=item vars

Predeclare global variable names (obsolete)

=item version

Perl extension for Version Objects

=item vmsish

Control VMS-specific language features

=item warnings

Control optional warnings

=item warnings::register

Warnings import function

=back

=head2 Standard Modules

Standard, bundled modules are all expected to behave in a well-defined
manner with respect to namespace pollution because they use the
Exporter module.  See their own documentation for details.

It's possible that not all modules listed below are installed on your
system. For example, the GDBM_File module will not be installed if you
don't have the gdbm library.

=over 12

=item AnyDBM_File

Provide framework for multiple DBMs

=item Archive::Extract

A generic archive extracting mechanism

=item Archive::Tar

Module for manipulations of tar archives

=item Archive::Tar::File

A subclass for in-memory extracted file from Archive::Tar

=item Attribute::Handlers

Simpler definition of attribute handlers

=item AutoLoader

Load subroutines only on demand

=item AutoSplit

Split a package for autoloading

=item B

The Perl Compiler

=item B::Concise

Walk Perl syntax tree, printing concise info about ops

=item B::Debug

Walk Perl syntax tree, printing debug info about ops

=item B::Deparse

Perl compiler backend to produce perl code

=item B::Lint

Perl lint

=item B::Showlex

Show lexical variables used in functions or files

=item B::Terse

Walk Perl syntax tree, printing terse info about ops

=item B::Xref

Generates cross reference reports for Perl programs

=item Benchmark

Benchmark running times of Perl code

=item CGI

Simple Common Gateway Interface Class

=item CGI::Apache

Backward compatibility module for CGI.pm

=item CGI::Carp

CGI routines for writing to the HTTPD (or other) error log

=item CGI::Cookie

Interface to Netscape Cookies

=item CGI::Fast

CGI Interface for Fast CGI

=item CGI::Pretty

Module to produce nicely formatted HTML code

=item CGI::Push

Simple Interface to Server Push

=item CGI::Switch

Backward compatibility module for defunct CGI::Switch

=item CGI::Util

Internal utilities used by CGI module

=item CORE

Pseudo-namespace for Perl's core routines

=item CPAN

Query, download and build perl modules from CPAN sites

=item CPAN::API::HOWTO

A recipe book for programming with CPAN.pm

=item CPAN::FirstTime

Utility for CPAN::Config file Initialization

=item CPAN::Kwalify

Interface between CPAN.pm and Kwalify.pm

=item CPAN::Nox

Wrapper around CPAN.pm without using any XS module

=item CPAN::Version

Utility functions to compare CPAN versions

=item CPANPLUS

API & CLI access to the CPAN mirrors

=item CPANPLUS::Dist::Base

Base class for custom distribution classes

=item CPANPLUS::Dist::Sample

Sample code to create your own Dist::* plugin

=item CPANPLUS::Shell::Classic

CPAN.pm emulation for CPANPLUS

=item CPANPLUS::Shell::Default::Plugins::HOWTO

Documentation on how to write your own plugins

=item Carp

Warn of errors (from perspective of caller)

=item Carp::Heavy

Heavy machinery, no user serviceable parts inside

=item Class::ISA

Report the search path for a class's ISA tree

=item Class::Struct

Declare struct-like datatypes as Perl classes

=item Compress::Raw::Zlib

Low-Level Interface to zlib compression library

=item Compress::Zlib

Interface to zlib compression library

=item Config

Access Perl configuration information

=item Cwd

Get pathname of current working directory

=item DB

Programmatic interface to the Perl debugging API

=item DBM_Filter

Filter DBM keys/values 

=item DBM_Filter::compress

Filter for DBM_Filter

=item DBM_Filter::encode

Filter for DBM_Filter

=item DBM_Filter::int32

Filter for DBM_Filter

=item DBM_Filter::null

Filter for DBM_Filter

=item DBM_Filter::utf8

Filter for DBM_Filter

=item DB_File

Perl5 access to Berkeley DB version 1.x

=item Data::Dumper

Stringified perl data structures, suitable for both printing and C<eval>

=item Devel::DProf

A Perl code profiler

=item Devel::InnerPackage

Find all the inner packages of a package

=item Devel::Peek

A data debugging tool for the XS programmer

=item Devel::SelfStubber

Generate stubs for a SelfLoading module

=item Digest

Modules that calculate message digests

=item Digest::MD5

Perl interface to the MD5 Algorithm

=item Digest::SHA

Perl extension for SHA-1/224/256/384/512

=item Digest::base

Digest base class

=item Digest::file

Calculate digests of files

=item DirHandle

Supply object methods for directory handles

=item Dumpvalue

Provides screen dump of Perl data.

=item DynaLoader

Dynamically load C libraries into Perl code

=item Encode

Character encodings

=item Encode::Alias

Alias definitions to encodings

=item Encode::Byte

Single Byte Encodings

=item Encode::CJKConstants

Internally used by Encode::??::ISO_2022_*

=item Encode::CN

China-based Chinese Encodings

=item Encode::CN::HZ

Internally used by Encode::CN

=item Encode::Config

Internally used by Encode

=item Encode::EBCDIC

EBCDIC Encodings

=item Encode::Encoder

Object Oriented Encoder

=item Encode::Encoding

Encode Implementation Base Class

=item Encode::GSM0338

ESTI GSM 03.38 Encoding

=item Encode::Guess

Guesses encoding from data

=item Encode::JP

Japanese Encodings

=item Encode::JP::H2Z

Internally used by Encode::JP::2022_JP*

=item Encode::JP::JIS7

Internally used by Encode::JP

=item Encode::KR

Korean Encodings

=item Encode::KR::2022_KR

Internally used by Encode::KR

=item Encode::MIME::Header

MIME 'B' and 'Q' header encoding

=item Encode::MIME::Name

Internally used by Encode

=item Encode::PerlIO

A detailed document on Encode and PerlIO

=item Encode::Supported

Encodings supported by Encode

=item Encode::Symbol

Symbol Encodings

=item Encode::TW

Taiwan-based Chinese Encodings

=item Encode::Unicode

Various Unicode Transformation Formats

=item Encode::Unicode::UTF7

UTF-7 encoding

=item English

Use nice English (or awk) names for ugly punctuation variables