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ri

 More than one method matched your request. You can refine
 your search by asking for information on one of:
 
      Continuation#, Dir::, StringScanner#, Matrix::, Matrix#[],
      Array::, Array#, Array#=, Struct#, Struct#=, Set::,
      Bignum#, Proc#, Hash::, Hash#, Hash#=, MatchData#,
      Vector::, Vector#, Fixnum#, CGI::Session#,
      CGI::Session#=, CGI::QueryExtension#, PStore#, PStore#=,
      String#, String#=, Method#, Thread#, Thread#[]=

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 Array# Array#= Array. DBM# DBM#= Dir. ENV#[]
 ENV#= GDBM# GDBM#= Hash# Hash#= Hash.
 Included. Integer# Mail# MatchData# Matrix#[]
 Matrix#= Matrix. Method# Net::HTTPRequest#
 Net::HTTPResponse# PStore# PStore#= Proc# String#[]
 String#= StringScanner# Struct# Struct#=
 Struct::XXX. TMail::Mail# Thread# UnboundMethod#
 Vector# Vector#= Vector. Win32::Registry#