Perl core modules - Perldoc Browser

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Most of these are lexically scoped, so an inner BLOCK may countermand them by saying: <pre><code>no integer; no strict 'refs'; no warnings;</code></pre> which lasts until the end of that BLOCK. Some pragmas are lexically scoped--typically those that affect the <code>$^H</code> hints variable. Others affect the current package instead, like <code>use vars</code> and <code>use subs</code>, which allow you to predeclare a variables or subroutines within a particular file rather than just a block. Such declarations are effective for the entire file for which they were declared. You cannot rescind them with <code>no vars</code> or <code>no subs</code>. The following pragmas are defined (and have their own documentation). <ul> <li><a href="/5.6.0/attributes">attributes</a> - Get/set subroutine or variable attributes </li> <li><a href="/5.6.0/attrs">attrs</a> - Set/get attributes of a subroutine (deprecated) </li> <li><a href="/5.6.0/autouse">autouse</a> - Postpone load of modules until a function is used </li> <li><a href="/5.6.0/base">base</a> - Establish IS-A relationship with base class at compile time </li> <li><a href="/5.6.0/blib">blib</a> - Use MakeMaker's uninstalled version of a package </li> <li><a href="/5.6.0/caller">caller</a> - Inherit pragmatic attributes from caller's context </li> <li><a href="/5.6.0/charnames">charnames</a> - Define character names for <code>\N{named}</code> string literal escape. </li> <li><a href="/5.6.0/constant">constant</a> - Declare constants </li> <li><a href="/5.6.0/diagnostics">diagnostics</a> - Force verbose warning diagnostics </li> <li><a href="/5.6.0/fields">fields</a> - Declare a class's attribute fields at compile-time </li> <li><a href="/5.6.0/filetest">filetest</a> - Control the filetest operators like <code>-r</code>, <code>-w</code> for AFS, etc. </li> <li><a href="/5.6.0/integer">integer</a> - Compute arithmetic in integer instead of double </li> <li><a href="/5.6.0/less">less</a> - Request less of something from the compiler (unimplemented) </li> <li><a href="/5.6.0/lib">lib</a> - Manipulate @INC at compile time </li> <li><a href="/5.6.0/locale">locale</a> - Use or avoid POSIX locales for built-in operations </li> <li><a href="/5.6.0/ops">ops</a> - Restrict unsafe operations when compiling </li> <li><a href="/5.6.0/overload">overload</a> - Overload Perl operations </li> <li><a href="/5.6.0/re">re</a> - Alter regular expression behavior </li> <li><a href="/5.6.0/sigtrap">sigtrap</a> - Enable simple signal handling </li> <li><a href="/5.6.0/strict">strict</a> - Restrict unsafe constructs </li> <li><a href="/5.6.0/subs">subs</a> - Predeclare subroutine names </li> <li><a href="/5.6.0/utf8">utf8</a> - Turn on UTF-8 and Unicode support </li> <li><a href="/5.6.0/vars">vars</a> - Predeclare global variable names (obsoleted by our()) </li> <li><a href="/5.6.0/warnings">warnings</a> - Control optional warnings </li> </ul> <h2 id="Standard-Modules"><a class="permalink" href="#Standard-Modules">#</a><a id="Standard"></a>Standard Modules</h2> 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. <ul> <li><a href="/5.6.0/AnyDBM_File">AnyDBM_File</a> - Provide framework for multiple DBM libraries </li> <li><a href="/5.6.0/AutoLoader">AutoLoader</a> - Load subroutines only on demand </li> <li><a href="/5.6.0/AutoSplit">AutoSplit</a> - Split a package for autoloading </li> <li><a href="/5.6.0/B">B</a> - Guts of the Perl code generator (aka compiler) </li> <li><a href="/5.6.0/B::Asmdata">B::Asmdata</a> - Autogenerated data about Perl ops, used to generate bytecode </li> <li><a href="/5.6.0/B::Assembler">B::Assembler</a> - Assemble Perl bytecode </li> <li><a href="/5.6.0/B::Bblock">B::Bblock</a> - Walk basic blocks </li> <li><a href="/5.6.0/B::Bytecode">B::Bytecode</a> - Perl compiler's bytecode backend </li> <li><a href="/5.6.0/B::C">B::C</a> - Perl compiler's C backend </li> <li><a href="/5.6.0/B::CC">B::CC</a> - Perl compiler's optimized C translation backend </li> <li><a href="/5.6.0/B::Debug">B::Debug</a> - Walk Perl syntax tree, printing debug info about ops </li> <li><a href="/5.6.0/B::Deparse">B::Deparse</a> - Perl compiler backend to produce Perl code </li> <li><a href="/5.6.0/B::Disassembler">B::Disassembler</a> - Disassemble Perl bytecode </li> <li><a href="/5.6.0/B::Lint">B::Lint</a> - Module to catch dubious constructs </li> <li><a href="/5.6.0/B::Showlex">B::Showlex</a> - Show lexical variables used in functions or files </li> <li><a href="/5.6.0/B::Stackobj">B::Stackobj</a> - Helper module for CC backend B::Stash -- XXX NFI XXX </li> <li><a href="/5.6.0/B::Terse">B::Terse</a> - Walk Perl syntax tree, printing terse info about ops </li> <li><a href="/5.6.0/B::Xref">B::Xref</a> - Generates cross reference reports for Perl programs </li> <li><a href="/5.6.0/Benchmark">Benchmark</a> - Benchmark running times of code </li> <li><a href="/5.6.0/ByteLoader">ByteLoader</a> - Load byte-compiled Perl code </li> <li><a href="/5.6.0/CGI">CGI</a> - Simple Common Gateway Interface class </li> <li><a href="/5.6.0/CGI::Apache">CGI::Apache</a> - Make things work with CGI.pm against Perl-Apache API </li> <li><a href="/5.6.0/CGI::Carp">CGI::Carp</a> - CGI routines for writing to the HTTPD (or other) error log </li> <li><a href="/5.6.0/CGI::Cookie">CGI::Cookie</a> - Interface to Netscape Cookies </li> <li><a href="/5.6.0/CGI::Fast">CGI::Fast</a> - CGI Interface for Fast CGI </li> <li><a href="/5.6.0/CGI::Pretty">CGI::Pretty</a> - Module to produce nicely formatted HTML code </li> <li><a href="/5.6.0/CGI::Push">CGI::Push</a> - Simple Interface to Server Push </li> <li><a href="/5.6.0/CGI::Switch">CGI::Switch</a> - Try more than one constructors and return the first object available </li> <li><a href="/5.6.0/CPAN">CPAN</a> - Query, download, and build Perl modules from CPAN sites </li> <li><a href="/5.6.0/CPAN::FirstTime">CPAN::FirstTime</a> - Utility for CPAN::Config file initialization </li> <li><a href="/5.6.0/CPAN::Nox">CPAN::Nox</a> - Wrapper around CPAN.pm without using any XS module </li> <li><a href="/5.6.0/Carp">Carp</a> - Act like warn/die from perspective of caller </li> <li><a href="/5.6.0/Carp::Heavy">Carp::Heavy</a> - Carp guts </li> <li><a href="/5.6.0/Class::Struct">Class::Struct</a> - Declare struct-like datatypes as Perl classes </li> <li><a href="/5.6.0/Config">Config</a> - Access Perl configuration information </li> <li><a href="/5.6.0/Cwd">Cwd</a> - Get pathname of current working directory </li> <li><a href="/5.6.0/DB">DB</a> - Programmatic interface to the Perl debugging API (experimental) </li> <li><a href="/5.6.0/DB_File">DB_File</a> - Perl5 access to Berkeley DB version 1.x </li> <li><a href="/5.6.0/Data::Dumper">Data::Dumper</a> - Serialize Perl data structures </li> <li><a href="/5.6.0/Devel::DProf">Devel::DProf</a> - A Perl execution profiler </li> <li><a href="/5.6.0/Devel::Peek">Devel::Peek</a> - A data debugging tool for the XS programmer </li> <li><a href="/5.6.0/Devel::SelfStubber">Devel::SelfStubber</a> - Generate stubs for a SelfLoading module </li> <li><a href="/5.6.0/DirHandle">DirHandle</a> - Supply object methods for directory handles </li> <li><a href="/5.6.0/Dumpvalue">Dumpvalue</a> - Provide screen dump of Perl data </li> <li><a href="/5.6.0/DynaLoader">DynaLoader</a> - Dynamically load C libraries into Perl code </li> <li><a href="/5.6.0/English">English</a> - Use English (or awk) names for ugly punctuation variables </li> <li><a href="/5.6.0/Env">Env</a> - Access environment variables as regular ones </li> <li><a href="/5.6.0/Errno">Errno</a> - Load the libc errno.h defines </li> <li><a href="/5.6.0/Exporter">Exporter</a> - Implement default import method for modules </li> <li><a href="/5.6.0/Exporter::Heavy">Exporter::Heavy</a> - Exporter guts </li> <li><a href="/5.6.0/ExtUtils::Command">ExtUtils::Command</a> - Utilities to replace common Unix commands in Makefiles etc. </li> <li><a href="/5.6.0/ExtUtils::Embed">ExtUtils::Embed</a> - Utilities for embedding Perl in C/C++ programs </li> <li><a href="/5.6.0/ExtUtils::Install">ExtUtils::Install</a> - Install files from here to there </li> <li><a href="/5.6.0/ExtUtils::Installed">ExtUtils::Installed</a> - Inventory management of installed modules </li> <li><a href="/5.6.0/ExtUtils::Liblist">ExtUtils::Liblist</a> - Determine libraries to use and how to use them </li> <li><a href="/5.6.0/ExtUtils::MM_Cygwin">ExtUtils::MM_Cygwin</a> - Methods to override Unix behavior in ExtUtils::MakeMaker </li> <li><a href="/5.6.0/ExtUtils::MM_OS2">ExtUtils::MM_OS2</a> - Methods to override Unix behavior in ExtUtils::MakeMaker </li> <li><a href="/5.6.0/ExtUtils::MM_Unix">ExtUtils::MM_Unix</a> - Methods used by ExtUtils::MakeMaker </li> <li><a href="/5.6.0/ExtUtils::MM_VMS">ExtUtils::MM_VMS</a> - Methods to override Unix behavior in ExtUtils::MakeMaker </li> <li><a href="/5.6.0/ExtUtils::MM_Win32">ExtUtils::MM_Win32</a> - Methods to override Unix behavior in ExtUtils::MakeMaker </li> <li><a href="/5.6.0/ExtUtils::MakeMaker">ExtUtils::MakeMaker</a> - Create an extension Makefile </li> <li><a href="/5.6.0/ExtUtils::Manifest">ExtUtils::Manifest</a> - Utilities to write and check a MANIFEST file ExtUtils::Miniperl, writemain - Write the C code for perlmain.c </li> <li><a href="/5.6.0/ExtUtils::Mkbootstrap">ExtUtils::Mkbootstrap</a> - Make a bootstrap file for use by DynaLoader </li> <li><a href="/5.6.0/ExtUtils::Mksymlists">ExtUtils::Mksymlists</a> - Write linker options files for dynamic extension </li> <li><a href="/5.6.0/ExtUtils::Packlist">ExtUtils::Packlist</a> - Manage .packlist files </li> <li><a href="/5.6.0/ExtUtils::testlib">ExtUtils::testlib</a> - Add blib/* directories to @INC </li> <li><a href="/5.6.0/Fatal">Fatal</a> - Replace functions with equivalents which succeed or die </li> <li><a href="/5.6.0/Fcntl">Fcntl</a> - Load the libc fcntl.h defines </li> <li><a href="/5.6.0/File::Basename">File::Basename</a> - Split a pathname into pieces </li> <li><a href="/5.6.0/File::CheckTree">File::CheckTree</a> - Run many filetest checks on a tree </li> <li><a href="/5.6.0/File::Compare">File::Compare</a> - Compare files or filehandles </li> <li><a href="/5.6.0/File::Copy">File::Copy</a> - Copy files or filehandles </li> <li><a href="/5.6.0/File::DosGlob">File::DosGlob</a> - DOS-like globbing and then some </li> <li><a href="/5.6.0/File::Find">File::Find</a> - Traverse a file tree </li> <li><a href="/5.6.0/File::Glob">File::Glob</a> - Perl extension for BSD filename globbing </li> <li><a href="/5.6.0/File::Path">File::Path</a> - Create or remove a series of directories </li> <li><a href="/5.6.0/File::Spec">File::Spec</a> - Portably perform operations on file names </li> <li><a href="/5.6.0/File::Spec::Functions">File::Spec::Functions</a> - Portably perform operations on file names </li> <li><a href="/5.6.0/File::Spec::Mac">File::Spec::Mac</a> - File::Spec for MacOS </li> <li><a href="/5.6.0/File::Spec::OS2">File::Spec::OS2</a> - Methods for OS/2 file specs </li> <li><a href="/5.6.0/File::Spec::Unix">File::Spec::Unix</a> - Methods used by File::Spec </li> <li><a href="/5.6.0/File::Spec::VMS">File::Spec::VMS</a> - Methods for VMS file specs </li> <li><a href="/5.6.0/File::Spec::Win32">File::Spec::Win32</a> - Methods for Win32 file specs </li> <li><a href="/5.6.0/File::stat">File::stat</a> - By-name interface to Perl's built-in stat() functions </li> <li><a href="/5.6.0/FileCache">FileCache</a> - Keep more files open than the system permits </li> <li><a href="/5.6.0/FileHandle">FileHandle</a> - Supply object methods for filehandles </li> <li><a href="/5.6.0/FindBin">FindBin</a> - Locate installation directory of running Perl program </li> <li><a href="/5.6.0/GDBM_File">GDBM_File</a> - Access to the gdbm library </li> <li><a href="/5.6.0/Getopt::Long">Getopt::Long</a> - Extended processing of command line options </li> <li><a href="/5.6.0/Getopt::Std">Getopt::Std</a> - Process single-character switches with switch clustering </li> <li><a href="/5.6.0/I18N::Collate">I18N::Collate</a> - Compare 8-bit scalar data according to current locale </li> <li><a href="/5.6.0/IO">IO</a> - Front-end to load various IO modules </li> <li><a href="/5.6.0/IO::Dir">IO::Dir</a> - Supply object methods for directory handles </li> <li><a href="/5.6.0/IO::File">IO::File</a> - Supply object methods for filehandles </li> <li><a href="/5.6.0/IO::Handle">IO::Handle</a> - Supply object methods for I/O handles </li> <li><a href="/5.6.0/IO::Pipe">IO::Pipe</a> - Supply object methods for pipes </li> <li><a href="/5.6.0/IO::Poll">IO::Poll</a> - Object interface to system poll call </li> <li><a href="/5.6.0/IO::Seekable">IO::Seekable</a> - Supply seek based methods for I/O objects </li> <li><a href="/5.6.0/IO::Select">IO::Select</a> - OO interface to the select system call </li> <li><a href="/5.6.0/IO::Socket">IO::Socket</a> - Object interface to socket communications </li> <li><a href="/5.6.0/IO::Socket::INET">IO::Socket::INET</a> - Object interface for AF_INET domain sockets </li> <li><a href="/5.6.0/IO::Socket::UNIX">IO::Socket::UNIX</a> - Object interface for AF_UNIX domain sockets </li> <li><a href="/5.6.0/IPC::Msg">IPC::Msg</a> - SysV Msg IPC object class </li> <li><a href="/5.6.0/IPC::Open2">IPC::Open2</a> - Open a process for both reading and writing </li> <li><a href="/5.6.0/IPC::Open3">IPC::Open3</a> - Open a process for reading, writing, and error handling </li> <li><a href="/5.6.0/IPC::Semaphore">IPC::Semaphore</a> - SysV Semaphore IPC object class </li> <li><a href="/5.6.0/IPC::SysV">IPC::SysV</a> - SysV IPC constants </li> <li><a href="/5.6.0/Math::BigFloat">Math::BigFloat</a> - Arbitrary length float math package </li> <li><a href="/5.6.0/Math::BigInt">Math::BigInt</a> - Arbitrary size integer math package </li> <li><a href="/5.6.0/Math::Complex">Math::Complex</a> - Complex numbers and associated mathematical functions </li> <li><a href="/5.6.0/Math::Trig">Math::Trig</a> - Trigonometric functions </li> <li><a href="/5.6.0/Net::Ping">Net::Ping</a> - Check a remote host for reachability </li> <li><a href="/5.6.0/Net::hostent">Net::hostent</a> - By-name interface to Perl's built-in gethost*() functions </li> <li><a href="/5.6.0/Net::netent">Net::netent</a> - By-name interface to Perl's built-in getnet*() functions </li> <li><a href="/5.6.0/Net::protoent">Net::protoent</a> - By-name interface to Perl's built-in getproto*() functions </li> <li><a href="/5.6.0/Net::servent">Net::servent</a> - By-name interface to Perl's built-in getserv*() functions </li> <li><a href="/5.6.0/O">O</a> - Generic interface to Perl Compiler backends </li> <li><a href="/5.6.0/Opcode">Opcode</a> - Disable named opcodes when compiling Perl code </li> <li><a href="/5.6.0/POSIX">POSIX</a> - Perl interface to IEEE Std 1003.1 </li> <li><a href="/5.6.0/Pod::Checker">Pod::Checker</a> - Check pod documents for syntax errors </li> <li><a href="/5.6.0/Pod::Html">Pod::Html</a> - Module to convert pod files to HTML </li> <li><a href="/5.6.0/Pod::InputObjects">Pod::InputObjects</a> - Manage POD objects </li> <li><a href="/5.6.0/Pod::Man">Pod::Man</a> - Convert POD data to formatted *roff input </li> <li><a href="/5.6.0/Pod::Parser">Pod::Parser</a> - Base class for creating POD filters and translators </li> <li><a href="/5.6.0/Pod::Select">Pod::Select</a> - Extract selected sections of POD from input </li> <li><a href="/5.6.0/Pod::Text">Pod::Text</a> - Convert POD data to formatted ASCII text </li> <li><a href="/5.6.0/Pod::Text::Color">Pod::Text::Color</a> - Convert POD data to formatted color ASCII text </li> <li><a href="/5.6.0/Pod::Usage">Pod::Usage</a> - Print a usage message from embedded pod documentation </li> <li><a href="/5.6.0/SDBM_File">SDBM_File</a> - Tied access to sdbm files </li> <li><a href="/5.6.0/Safe">Safe</a> - Compile and execute code in restricted compartments </li> <li><a href="/5.6.0/Search::Dict">Search::Dict</a> - Search for key in dictionary file </li> <li><a href="/5.6.0/SelectSaver">SelectSaver</a> - Save and restore selected file handle </li> <li><a href="/5.6.0/SelfLoader">SelfLoader</a> - Load functions only on demand </li> <li><a href="/5.6.0/Shell">Shell</a> - Run shell commands transparently within Perl </li> <li><a href="/5.6.0/Socket">Socket</a> - Load the libc socket.h defines and structure manipulators </li> <li><a href="/5.6.0/Symbol">Symbol</a> - Manipulate Perl symbols and their names </li> <li><a href="/5.6.0/Sys::Hostname">Sys::Hostname</a> - Try every conceivable way to get hostname </li> <li><a href="/5.6.0/Sys::Syslog">Sys::Syslog</a> - Interface to the libc syslog(3) calls </li> <li><a href="/5.6.0/Term::Cap">Term::Cap</a> - Termcap interface </li> <li><a href="/5.6.0/Term::Complete">Term::Complete</a> - Word completion module </li> <li><a href="/5.6.0/Term::ReadLine">Term::ReadLine</a> - Interface to various `readline' packages. </li> <li><a href="/5.6.0/Test">Test</a> - Provides a simple framework for writing test scripts </li> <li><a href="/5.6.0/Test::Harness">Test::Harness</a> - Run Perl standard test scripts with statistics </li> <li><a href="/5.6.0/Text::Abbrev">Text::Abbrev</a> - Create an abbreviation table from a list </li> <li><a href="/5.6.0/Text::ParseWords">Text::ParseWords</a> - Parse text into a list of tokens or array of arrays </li> <li><a href="/5.6.0/Text::Soundex">Text::Soundex</a> - Implementation of the Soundex Algorithm as described by Knuth Text::Tabs -- expand and unexpand tabs per expand(1) and unexpand(1) </li> <li><a href="/5.6.0/Text::Wrap">Text::Wrap</a> - Line wrapping to form simple paragraphs </li> <li><a href="/5.6.0/Tie::Array">Tie::Array</a> - Base class for tied arrays </li> <li><a href="/5.6.0/Tie::Handle">Tie::Handle</a> - Base class definitions for tied handles </li> <li><a href="/5.6.0/Tie::Hash">Tie::Hash</a> - Base class definitions for tied hashes </li> <li><a href="/5.6.0/Tie::RefHash">Tie::RefHash</a> - Use references as hash keys </li> <li><a href="/5.6.0/Tie::Scalar">Tie::Scalar</a> - Base class definitions for tied scalars </li> <li><a href="/5.6.0/Tie::SubstrHash">Tie::SubstrHash</a> - Fixed-table-size, fixed-key-length hashing </li> <li><a href="/5.6.0/Time::Local">Time::Local</a> - Efficiently compute time from local and GMT time </li> <li><a href="/5.6.0/Time::gmtime">Time::gmtime</a> - By-name interface to Perl's built-in gmtime() function </li> <li><a href="/5.6.0/Time::localtime">Time::localtime</a> - By-name interface to Perl's built-in localtime() function </li> <li><a href="/5.6.0/Time::tm">Time::tm</a> - Internal object used by Time::gmtime and Time::localtime </li> <li><a href="/5.6.0/UNIVERSAL">UNIVERSAL</a> - Base class for ALL classes (blessed references) </li> <li><a href="/5.6.0/User::grent">User::grent</a> - By-name interface to Perl's built-in getgr*() functions </li> <li><a href="/5.6.0/User::pwent">User::pwent</a> - By-name interface to Perl's built-in getpw*() functions </li> </ul> </div> <div id="footer"> Perldoc Browser is maintained by Dan Book (<a href="https://metacpan.org/author/DBOOK">DBOOK</a>). 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