Perl module thorough explanation

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A description of Perl modules. A module in Perl is a mechanism for using frequently used functions and convenient functions in a program.

Once you've learned the basic Perl grammar, try using different modules. By combining modules, you can easily solve complex problems and help automate operations.

Also, on the module distribution site called CPAN, many useful modules are registered by volunteers and can be used free of charge. See CPAN Module Description for how to use the cpan command.

How to create a module

If you want to know the basic knowledge for creating modules such as "packages", please refer to "Module basics". If you want to actually create a module yourself, it is a quick way to create a module template using Module::Starter module.

Module existence check

If you want to know if a particular module exists, the quickest way is to check for documentation with the perldoc command.

# perldoc command
perldoc Mojolicious

If you want to know where the module is installed, use the "-l" option. The path is displayed.

perldoc -l Mojolicious

If you want to know the module version, it is best to actually look at the module file using the "-m" option.

perldoc -m Mojolicious

Look for the package variable for which the version is specified.

our $VERSION = '7.25';

Module loading path

Please refer to the following for how to add the module loading path.

Standard module

A "standard module" is a module that is available from the beginning when you install Perl. There are quite a lot of things that can be done with just the "standard module".

Module name	Explanation
strict	Make grammar strict
warnings	Output a warning
Getopt::Long	Handle command line argument options
Archive::Tar	Extract and create tar file (v5.10 or later)
Cwd	Get the path of the current directory
File::Basename	Get the base name and directory name of the file
File::Copy	Move and copy files
File::Path	Creating and deleting multi-level directories
File::Spec	Portable processing for filenames
File::Temp	Creating a temporary file
File::Find	File search
FindBin	Get the path of the directory where the script resides
Encode	Properly handle multi-byte strings such as Japanese
utf8	Convert strings in source code to decoded strings
Carp	Raise an exception from the perspective of the module caller
lib	Add module search path
Time::Piece	Standard module for handling date/time(core module from v5.10)
Time::Local	Reverse return of localtime and gmtime
base	Class inheritance
Data::Dumper	Output the contents of the variable
Benchmark	Benchmark (performance comparison)
JSON	Parsing JSON data
MIME::Base64	Encoding to Base64 format
MIME::QuotedPrint	Encoding to quoted-printable format
Digest::MD5	Find the MD5 value
Digest::SHA	Find various SHA values (v5.10 or later)
Storable	Data serialization
Scalar::Util	Utility for scalar values
List::Util	Various operations on arrays
Hash::Uti	Hash key restrictions
Sys::Hostname	Get host name
Net::FTP	FTP client
Net::Ping	Confirmation of the existence of the remote host
Exporter	Function export
CPAN	Install modules from CPAN
Pod::Usage	Output of POD document
Errno	A constant that represents the system error number
POSIX	Functions defined in POSIX
Math::BigInt Math::BigFloat	Calculation of large numbers
Class::Struct	Core module that provides object orientation

CPAN module commentary

Perl makes it easy to install and use free modules from CPAN.

Web development

Mojolicious	Web framework
Mojolicious::Plugin::AutoRoute	Automatically generate troublesome routes
Amazon::S3::Thin	Thin, lightweight, low-level Amazon S3 client

Send email

MIME::Lite

Send email easily

Development environment

perlbrew	Install Perl in your environment
cpanm	CPAN installation

Object-oriented

Class::Accessor::Fast	Creating accessors
Object::Simple	Creating accessors with default values (Japanese translation)

Utility

DDP	Output data in an easy-to-understand way
D	Encode data and dump to standard error

Database

DBIx::Custom	Easy database operation
MySQL::Diff	View MySQL diffs

date

DateTime

General-purpose processing of dates

Statistical analysis

PDL	Statistical analysis

Image editing

Imager

edit a picture

CSV

Text::CSV::Encoded

Handles CSV files containing Japanese

Text diff

Text::Diff

Check text differences

XML

XML::Simple

Simple XML parser

HTML validation

Validator::Custom

HTML form validation

Paging

Data::Page	Support for paging processing
Data::Page::Navigation	Creating page navigation

Module creation

Module::Starter

Create a module template

Performance analysis

Devel::NYTProf

Easy-to-use profiler

Source code formatting

perltidy

Source code formatting

ping

Net::Ping::External

Executing the ping command

Exam

IO::ScalarArray	Automatic test of standard input
IO::Capture	Automatic test of standard output and standard error output

FFI

FFI::Raw

Call a function in a dynamic library

Trigonometric functions

Math::Trig

Various trigonometric functions

Web scraping

Selenium::Remote::Driver	JavaScript-enabled web scraping
Selenium::Chrome	JavaScript-enabled web scraping using Chome

Perl module introduction

Please see below for the modules that could not be explained in detail here.

Perl module introduction

Deprecated modules

Deprecated module.

Module name	Explanation
cgi-lib.pl	It's very old. Use CGI.pm instead
Devel::DProf	It is a simple profiler (performance analysis tool), but it has many bugs, so it will be removed from the core module.
encoding	Officially deprecated. Save the source code in UTF-8 and use the utf8 pragma
jcode.pl	It's very old. Use the Encode module to work with strings
Jcode	Officially deprecated. Use the Encode module to work with strings
bytes	Officially deprecated. Actually encode with the encode function of the Encode module and then check the length
vars	old. It has the same effect as declaring a package variable in our. Now let's declare the package variable using our
Class::ISA	Officially deprecated. Removed from core module

Perl ABC