gistfile1.rb

# source: http://www.enriquedelgado.com/articles/2007/04/25/interactive-ruby-console-tip-remember-the-last-x-commands-even-after-logging-out
# file: .irbrc

IRB.conf[:PROMPT_MODE] = :SIMPLE

require 'irb/completion'

IRB.conf[:AUTO_INDENT] = true

# Session History

HISTFILE = "~/.irb.hist" unless defined? HISTFILE
MAXHISTSIZE = 100 unless defined? MAXHISTSIZE

begin
  if defined? Readline::HISTORY
    histfile = File::expand_path(HISTFILE)

    if File::exists?(histfile)
      lines = IO::readlines(histfile).collect { |line| line.chomp }
      Readline::HISTORY.push(*lines)
    end

    Kernel::at_exit {
      lines = Readline::HISTORY.to_a.reverse.uniq.reverse
      lines = lines[-MAXHISTSIZE, MAXHISTSIZE] if lines.nitems > MAXHISTSIZE

      File::open(histfile, File::WRONLY | File::CREAT | File::TRUNC) {|f| lines.each {|line| f.puts line }}
    }
  end
end