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# Core modules (I)

Perl 5 version 18.2 documentation
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# Core modules (I)

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- I18N::Collate - compare 8-bit scalar data according to the current locale
- I18N::Langinfo - query locale information
- I18N::LangTags - functions for dealing with RFC3066-style language tags
- I18N::LangTags::Detect - detect the user's language preferences
- I18N::LangTags::List - tags and names for human languages
- IO - load various IO modules
- IO::Compress::Base - Base Class for IO::Compress modules
- IO::Compress::Bzip2 - Write bzip2 files/buffers
- IO::Compress::Deflate - Write RFC 1950 files/buffers
- IO::Compress::Gzip - Write RFC 1952 files/buffers
- IO::Compress::RawDeflate - Write RFC 1951 files/buffers
- IO::Compress::Zip - Write zip files/buffers
- IO::Dir - supply object methods for directory handles
- IO::File - supply object methods for filehandles
- IO::Handle - supply object methods for I/O handles
- IO::Pipe - supply object methods for pipes
- IO::Poll - Object interface to system poll call
- IO::Seekable - supply seek based methods for I/O objects
- IO::Select - OO interface to the select system call
- IO::Socket - Object interface to socket communications
- IO::Socket::INET - Object interface for AF_INET domain sockets
- IO::Socket::UNIX - Object interface for AF_UNIX domain sockets
- IO::Uncompress::AnyInflate - Uncompress zlib-based (zip, gzip) file/buffer
- IO::Uncompress::AnyUncompress - Uncompress gzip, zip, bzip2 or lzop file/buffer
- IO::Uncompress::Base - Base Class for IO::Uncompress modules
- IO::Uncompress::Bunzip2 - Read bzip2 files/buffers
- IO::Uncompress::Gunzip - Read RFC 1952 files/buffers
- IO::Uncompress::Inflate - Read RFC 1950 files/buffers
- IO::Uncompress::RawInflate - Read RFC 1951 files/buffers
- IO::Uncompress::Unzip - Read zip files/buffers
- IO::Zlib - IO:: style interface to Compress::Zlib
- IPC::Cmd - finding and running system commands made easy
- IPC::Msg - SysV Msg IPC object class
- IPC::Open2 - open a process for both reading and writing using open2()
- IPC::Open3 - open a process for reading, writing, and error handling using open3()
- IPC::Semaphore - SysV Semaphore IPC object class
- IPC::SharedMem - SysV Shared Memory IPC object class
- IPC::SysV - System V IPC constants and system calls