= Ruby Standard Library The Ruby Standard Library is a vast collection of classes and modules that you can require in your code for additional features. Below is an overview of libraries and extensions followed by a brief description. == Libraries Abbrev:: Calculates a set of unique abbreviations for a given set of strings Base64:: Support for encoding and decoding binary data using a Base64 representation Benchmark:: Provides methods to measure and report the time used to execute code CGI:: Support for the Common Gateway Interface protocol DEBUGGER__:: Debugging functionality for Ruby Delegator:: Provides three abilities to delegate method calls to an object DRb:: Distributed object system for Ruby English.rb:: Require 'English.rb' to reference global variables with less cryptic names ERB:: An easy to use but powerful templating system for Ruby Find:: This module supports top-down traversal of a set of file paths GetoptLong:: Parse command line options similar to the GNU C getopt_long() MakeMakefile:: Module used to generate a Makefile for C extensions Monitor:: Provides an object or module to use safely by more than one thread Net::FTP:: Support for the File Transfer Protocol Net::HTTP:: HTTP client api for Ruby Net::IMAP:: Ruby client api for Internet Message Access Protocol Net::POP3:: Ruby client library for POP3 Net::SMTP:: Simple Mail Transfer Protocol client library for Ruby Observable:: Provides a mechanism for publish/subscribe pattern in Ruby OpenURI:: An easy-to-use wrapper for Net::HTTP, Net::HTTPS and Net::FTP Open3:: Provides access to stdin, stdout and stderr when running other programs OptionParser:: Ruby-oriented class for command-line option analysis PP:: Provides a PrettyPrinter for Ruby objects PrettyPrinter:: Implements a pretty printing algorithm for readable structure PStore:: Implements a file based persistence mechanism based on a Hash RbConfig:: Information of your configure and build of Ruby resolv-replace.rb:: Replace Socket DNS with Resolv Resolv:: Thread-aware DNS resolver library in Ruby Rinda:: The Linda distributed computing paradigm in Ruby Gem:: Package management framework for Ruby SecureRandom:: Interface for secure random number generator Set:: Provides a class to deal with collections of unordered, unique values Shellwords:: Manipulates strings with word parsing rules of UNIX Bourne shell Singleton:: Implementation of the Singleton pattern for Ruby Tempfile:: A utility class for managing temporary files Time:: Extends the Time class with methods for parsing and conversion Timeout:: Auto-terminate potentially long-running operations in Ruby tmpdir.rb:: Extends the Dir class to manage the OS temporary file path TSort:: Topological sorting using Tarjan's algorithm un.rb:: Utilities to replace common UNIX commands URI:: A Ruby module providing support for Uniform Resource Identifiers WeakRef:: Allows a referenced object to be garbage-collected YAML:: Ruby client library for the Psych YAML implementation == Extensions Coverage:: Provides coverage measurement for Ruby Digest:: Provides a framework for message digest libraries IO:: Extensions for Ruby IO class, including #wait and ::console NKF:: Ruby extension for Network Kanji Filter objspace:: Extends ObjectSpace module to add methods for internal statistics Pathname:: Representation of the name of a file or directory on the filesystem PTY:: Creates and manages pseudo terminals Readline:: Provides an interface for GNU Readline and Edit Line (libedit) Ripper:: Provides an interface for parsing Ruby programs into S-expressions Socket:: Access underlying OS socket implementations Syslog:: Ruby interface for the POSIX system logging facility WIN32OLE:: Provides an interface for OLE Automation in Ruby = Default gems == Libraries Bundler:: Manage your Ruby application's gem dependencies CMath:: Provides Trigonometric and Transcendental functions for complex numbers CSV:: Provides an interface to read and write CSV files and data E2MM:: Module for defining custom exceptions with specific messages FileUtils:: Several file utility methods for copying, moving, removing, etc Forwardable:: Provides delegation of specified methods to a designated object IPAddr:: Provides methods to manipulate IPv4 and IPv6 IP addresses IRB:: Interactive Ruby command-line tool for REPL (Read Eval Print Loop) Logger:: Provides a simple logging utility for outputting messages Matrix:: Represents a mathematical matrix. Mutex_m:: Mixin to extend objects to be handled like a Mutex OpenStruct:: Class to build custom data structures, similar to a Hash Prime:: Prime numbers and factorization library Racc:: A LALR(1) parser generator written in Ruby. RDoc:: Produces HTML and command-line documentation for Ruby REXML:: An XML toolkit for Ruby RSS:: Family of libraries that support various formats of XML "feeds" Scanf:: A Ruby implementation of the C function scanf(3) Shell:: An idiomatic Ruby interface for common UNIX shell commands Synchronizer:: A module that provides a two-phase lock with a counter ThreadsWait:: Watches for termination of multiple threads Tracer:: Outputs a source level execution trace of a Ruby program WEBrick:: An HTTP server toolkit for Ruby == Extensions BigDecimal:: Provides arbitrary-precision floating point decimal arithmetic Date:: A subclass of Object includes Comparable module for handling dates DateTime:: Subclass of Date to handling dates, hours, minutes, seconds, offsets DBM:: Provides a wrapper for the UNIX-style Database Manager Library Etc:: Provides access to information typically stored in UNIX /etc directory Fcntl:: Loads constants defined in the OS fcntl.h C header file Fiddle:: A libffi wrapper for Ruby GDBM:: Ruby extension for the GNU dbm (gdbm) library IO::console:: Console interface JSON:: Implements Javascript Object Notation for Ruby OpenSSL:: Provides SSL, TLS and general purpose cryptography for Ruby Psych:: A YAML parser and emitter for Ruby SDBM:: Provides a simple file-based key-value store with String keys and values StringIO:: Pseudo I/O on String objects StringScanner:: Provides lexical scanning operations on a String Zlib:: Ruby interface for the zlib compression/decompression library = Bundled gems == Libraries DidYouMean:: "Did you mean?" experience in Ruby MiniTest:: A test suite with TDD, BDD, mocking and benchmarking Net::Telnet:: Telnet client library for Ruby PowerAssert:: Power Assert for Ruby. Rake:: Ruby build program with capabilities similar to make Test::Unit:: A compatibility layer for MiniTest XMLRPC:: Remote Procedure Call over HTTP support for Ruby