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If you don't find an entry in the standard library that fits your needs, someone still may have written code that will be useful to you. Many superb library modules exist that are not included in the standard distribution, for various practical, political, and pathetic reasons. To find out what is available, you can look at the Comprehensive Perl Archive Network (CPAN). See the discussion of CPAN in Chapter 1, Introduction. Here are the major categories of modules available from CPAN: Module listing format Perl core modules, Perl language extensions, and documentation tools Development support Operating system interfaces Networking, device control (modems), and interprocess communication Data types and data type utilities Database interfaces User interfaces Interfaces to or emulations of other programming languages Filenames, filesystems, and file locking (see also filehandles) String processing, language text processing, parsing, and searching Option, argument, parameter, and configuration-file processing Internationalization and locale Authentication, security, and encryption World Wide Web, HTML, HTTP, CGI, and MIME Server and daemon utilities Archiving, compression, and conversion Images, pixmap and bitmap manipulation, drawing and graphing Mail and Usenet news Control-flow utilities (callbacks and exceptions) Filehandle, directory handle, and input/output stream utilities Microsoft Windows modules Miscellaneous modules
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