irb历史记录不起作用

我不知道为什么上面的方法不起作用,但我找到了一个文件, /etc/irbrc

# Some default enhancements/settings for IRB, based on
# http://wiki.rubygarden.org/Ruby/page/show/Irb/TipsAndTricks

unless defined? ETC_IRBRC_LOADED

  # Require RubyGems by default.
  require 'rubygems'

  # Activate auto-completion.
  require 'irb/completion'

  # Use the simple prompt if possible.
  IRB.conf[:PROMPT_MODE] = :SIMPLE if IRB.conf[:PROMPT_MODE] == :DEFAULT

  # Setup permanent history.
  HISTFILE = "~/.irb_history"
  MAXHISTSIZE = 100
  begin
    histfile = File::expand_path(HISTFILE)
    if File::exists?(histfile)
      lines = IO::readlines(histfile).collect { |line| line.chomp }
      puts "Read #{lines.nitems} saved history commands from '#{histfile}'." if $VERBOSE
      Readline::HISTORY.push(*lines)
    else
      puts "History file '#{histfile}' was empty or non-existant." if $VERBOSE
    end
    Kernel::at_exit do
      lines = Readline::HISTORY.to_a.reverse.uniq.reverse
      lines = lines[-MAXHISTSIZE, MAXHISTSIZE] if lines.nitems > MAXHISTSIZE
      puts "Saving #{lines.length} history lines to '#{histfile}'." if $VERBOSE
      File::open(histfile, File::WRONLY|File::CREAT|File::TRUNC) { |io| io.puts lines.join("\n") }
    end
  rescue => e
    puts "Error when configuring permanent history: #{e}" if $VERBOSE
  end

  ETC_IRBRC_LOADED=true
end

This person

require 'irb/completion'
require 'irb/ext/save-history'
ARGV.concat [ "--readline", "--prompt-mode", "simple" ]
IRB.conf[:SAVE_HISTORY] = 100
IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb-save-history" 

这是一个已知的bug,有可用的补丁。最简单的解决方案是覆盖save-history.rb:

/usr/lib/ruby/1.8/irb/ext/save-history.rb

对于固定版本:

http://pastie.org/513500

或者一次性完成:

wget -O /usr/lib/ruby/1.8/irb/ext/save-history.rb http://pastie.org/pastes/513500/download

检查以确保您使用libreadline构建了ruby,因为没有它,irb历史记录似乎无法工作。

~/.irbrc . 如果是这种情况,将liwp的答案中的内容复制到额外的配置中,它应该可以工作。

我在Ubuntu20.04上遇到了同样的问题,并通过运行以下命令进行了修复:

gem install irb