| Module name | Description | In core since |
|---|
| base | Specifies the base classes of the current package at compile time (see Chapter 16) | 5.005 |
| Benchmark | Provides utilities to time fragments of Perl code (see Chapter 19) | 5.003 |
| Carp | Provides subroutines that warn or throw exceptions, reporting the problem from the caller's location (see Chapter 13) | 5.6 |
| charnames | Enables the use of character names via \N{CHARNAME} string literal escapes (see Chapter 4) | 5.6 |
| CPAN | Simplifies the downloading and installation of CPAN modules | 5.004 |
| Data::Dumper | Converts data structures into string representations of Perl code (see Chapters 15, 17, and 18) | 5.005 |
| Devel::DProf | Profiles Perl code (see Chapter 19) | 5.6 |
| English | Defines readable English names for special variables (see Chapter 5) | 5.003 |
| Fatal | Replaces functions and subroutines with equivalents that either succeed or throw an exception (see Chapter 13) | 5.005 |
| File::Glob | Implements command-line filename globbing (see Chapter 8) | 5.6 |
| File::Temp | Provides a safe and efficient way to create temporary files (see Chapter 17) | 5.6 |
| Getopt::Long | Parses command-line options (see Chapter 14) | 5.003 |
| IO::File | Creates I/O objects connected to files (see Chapter 10) | 5.004 |
| IO::Handle | Acts as the base class for filehandles and objects (see Chapter 5) | 5.004 |
| List::Util | Provides additional list-processing utilities missing from the core language (see Chapters 2 and 8) | 5.8 |
| Memoize | Optimizes subroutines by caching their return values and reusing them (see Chapters 8 and 19) | 5.003 |
| overload | Allows existing Perl operators to be redefined for objects of the current class (see Chapter 15) | 5.003 |
| Scalar::Util | Provides additional scalar-processing utilities missing from the core language (see Chapters 8, 10, and 15) | 5.8 |
| strict | Prohibits unsafe uses of package variables, symbolic references, and barewords (see Chapters 4 and 18) | 5.8 |
| Test::Harness | Executes and summarizes Perl test suites (see Chapter 18) | 5.8 |
| Test::More | Provides more sophisticated utilities for writing tests (see Chapter 18) | 5.8 |
| Test::Simple | Provides basic utilities for writing tests (see Chapter 18) | 5.8 |
| Time::HiRes | Installs high-resolution versions of Perl's built-in time-keeping functions (see Chapter 8) | 5.8 |
| version | Allows multipart versions to be specified as objects (see Chapter 17) | 5.10 |
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