You use Tie::Cycle to go through a list over and over again. Once you get to the end of the list, you go back to the beginning.

Crypt::MySQL emulates the MySQL PASSWORD() function. The module does not depend on an interface to the MySQL database server. This enables the comparison of encrypted passwords without the need for a real MySQL environment.

Sys::Hostname::Long tries very hard to get the full hostname of a system.

Devel::CheckBin is a perl module that checks whether a particular command is available.

File locking in Perl is usually done using the flock function. Unfortunately, this only allows locks on whole files and is often implemented in terms of the flock(2) system function which has some shortcomings (especially concerning locks on remotely mounted file systems) and slightly different behaviour than fcntl(2).

Config::INI is a module that facilates the reading and writing of .ini-style configuration files.

This module attempts to emulate the behavior of Class::Accessor::Fast as accurately as possible using the Moose attribute system. The public API of Class::Accessor::Fast is wholly supported, but the private methods are not.

The File::List module crawls the directory tree starting at the provided base directory and can return files (and/or directories if desired) matching a regular expression.

This module provides a Perl interface to the iconv() codeset conversion function, as defined by the Single UNIX Specification. For more details see the POD documentation embedded in the file Iconv.pm, which will also be installed as Text::Iconv(3) man page.

Carp::Assert::More is a set of handy assertion functions for Perl.

IO::String is an IO::File (and IO::Handle) compatible class that reads or writes data from in-core strings.

This module is an implementation of the BGP-4 inter-domain routing protocol. It encapsulates all of the functionality needed to establish and maintain a BGP peering session and exchange routing update information with the peer. It aims to provide a simple API to the BGP protocol for the purposes of automation, logging, monitoring, testing, and similar tasks using the power and flexibility of perl. The module does not implement the functionality of a RIB (Routing Information Base) nor does it modify the kernel routing table of the host system. However, such operations could be implemented using the API provided by the module.

Text::CSV provides facilities for the composition and decomposition of comma-separated values. An instance of the Text::CSV class can combine fields into a CSV string and parse a CSV string into fields.

A CPAN::Meta::Requirements object models a set of version constraints like those specified in the META.yml or META.json files in CPAN distributions, and as defined by CPAN::Meta::Spec. It can be built up by adding more and more constraints, and will reduce them to the simplest representation.

This toolkit primarily provides modules for performing both traditional and object-oriented i/o) on things *other* than normal filehandles; in particular, IO::Scalar, IO::ScalarArray, and IO::Lines.

This is a module for computing the difference between two files, two strings, or any other two lists of things. It uses an intelligent algorithm similar to (or identical to) the one used by the Unix "diff" program. It is guaranteed to find the *smallest possible* set of differences.

This module provides tools to deal with International Standard Music Numbers.

Role::Tiny is a minimalist role composition tool.

This module exposes interpreter threads to the Perl level.

This package contains SGMLS.pm, a perl5 class library for parsing the output from an SGML parser such as OpenSP. It also includes the sgmlspl command, an Perl script showcasing how the library can be used.

This module provides functions for fast reading and writing of files.

This is yet another implementation of Term::Size. Now in pure Perl, with the exception of a C probe run at build time.

This module converts Perl data structures to JSON and vice versa.

This module first checks to see if either Cpanel::JSON::XS or JSON::XS is already loaded, in which case it uses that module. Otherwise it tries to load Cpanel::JSON::XS, then JSON::XS, then JSON::PP in order, and either uses the first module it finds or throws an error.