Defers loading of a module until it's used

Creates compile-time constants

Checks and compares running times of code

Accesses Perl configuration information

Imports environment variables

Uses English or awk names for punctuation variables

Finds path of currently executing program

Provides extended processing of command-line options

Processes single-character switches with switch clustering

Manipulates @INC at compile time

Runs shell commands transparently within Perl

Restricts unsafe constructs

Generates anonymous globs; qualifies variable names

Predeclares subroutine names

Predeclares global variable names

Generates error messages

Forces verbose warning diagnostics

Enables stack backtrace on unexpected signals

Provides Perl interface to UNIX syslog (3) calls

Gets pathname of current working directory

Supplies object methods for directory handles

Loads the C Fcntl.h defines

Parses file specifications

Runs many tests on a collection of files

Copies files or filehandles

Traverses a file tree

Creates or removes a series of directories

Keeps more files open than the system permits

Supplies object methods for filehandles

Saves and restores selected filehandles

Top-level interface to IO::* classes

Object methods for filehandles

Object methods for I/O handles

Object methods for pipes

Seek-based methods for I/O objects

Object interface to select

Object interface to sockets

Uses POSIX locales for built-in operations

Converts POD data to HTML

Converts POD data to formatted ASCII text

Searches for key in dictionary file

Interfaces termcap

Word-completion module

Creates an abbreviation table from a list

Parses text into an array of tokens

Implements the Soundex Algorithm described by Knuth

Expands and unexpands tabs

Wraps text into a paragraph

Provides framework for multiple DBMs

Provides access to Berkeley DB

Provides tied access to GDBM library

Provides tied access to NDBM files

Provides tied access to ODBM files

Provides tied access to SDBM files

Does integer arithmetic instead of double precision

Provides arbitrary-length, floating-point math package

Provides arbitrary-length integer math package

Provides complex numbers package

Interfaces web server (Common Gateway Interface)

Supports Apache's Perl module

Details log server errors with helpful context

Supports FastCGI (persistent server process)

Supports server push

Provides simple interface for multiple server types

Opens a process for both reading and writing

Opens a process for reading, writing, and error handling

Checks whether a host is online

Loads the C socket.h defines and structure manipulators

Tries every conceivable way to get hostname

Provides simple interface to CPAN

Provides utility for creating CPAN configuration file

Runs CPAN while avoiding compiled extensions

Efficiently computes time from local and GMT time

Compares 8-bit scalar data according to the current locale

Declares struct-like datatypes as Perl classes

Provides object interface to stat function

Provides object interface to gethost* functions

Provides object interface to getnet* functions

Provides object interface to getproto* functions

Provides object interface to getserv* functions

Provides object interface to gmtime function

Provides object interface to localtime function

Provides internal object for Time::{gm,local}time

Provides object interface to getgr* functions

Provides object interface to getpw* functions

Loads functions only on demand

Splits a package for autoloading

Generates stubs for a SelfLoading module

Provides automatic dynamic loading of Perl modules

Loads functions only on demand

Finds blib directory structure during module builds

Provides utilities for embedding Perl in C programs

Installs files from here to there

Determines libraries to use and how to use them

Creates a Makefile for a Perl extension

Provides utilities to write and check a MANIFEST file

Writes the C code for perlmain.c

Makes a bootstrap file for use by DynaLoader

Writes linker-option files for dynamic extension

Provides methods to override UNIX behavior in ExtUtils::MakeMaker

Provides methods used by ExtUtils::MakeMaker

Provides methods to override UNIX behavior in ExtUtils::MakeMaker

Fixes @INC to use just-built extension

Disables opcodes when compiling Perl code

Provides pragma for use with Opcode module

Interfaces to IEEE Std 1003.1

Creates safe namespaces for evaluating Perl code

Runs Perl standard test scripts with statistics

Enables VMS-specific features

Provides default import method for modules

Overloads Perl's mathematical operations

Provides base-class definitions for tied hashes with references as keys

Provides base-class definitions for tied hashes

Provides base-class definitions for tied scalars

Provides base-class definitions for tied hashes

Provides base-class definitions for tied scalars

Provides fixed-table-size, fixed-key-length hashing

Provides base-class definitions for all classes