ruby-on-rails - rails new 或rails -h都无法加载，无法加载此类文件-io/console

Question

[ec2-user@ip-XX-XXX-XXX-XXX rails]$ rails -h
/usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- io/console (LoadError)
    from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/local/share/ruby/gems/2.0/gems/thor-0.19.1/lib/thor/shell/basic.rb:2:in `<top (required)>'
    from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/local/share/ruby/gems/2.0/gems/thor-0.19.1/lib/thor/shell/color.rb:1:in `<top (required)>'
    from /usr/local/share/ruby/gems/2.0/gems/thor-0.19.1/lib/thor/shell.rb:17:in `shell'
    from /usr/local/share/ruby/gems/2.0/gems/thor-0.19.1/lib/thor/base.rb:439:in `start'
    from /usr/local/share/ruby/gems/2.0/gems/railties-4.1.0/lib/rails/commands/application.rb:17:in `<top (required)>'
    from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/local/share/ruby/gems/2.0/gems/railties-4.1.0/lib/rails/cli.rb:14:in `<top (required)>'
    from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/local/share/ruby/gems/2.0/gems/railties-4.1.0/bin/rails:9:in `<top (required)>'
    from /usr/local/bin/rails:23:in `load'
    from /usr/local/bin/rails:23:in `<main>'

我确实使用$ gem install rails安装了Ruby on Rails，它也完成得很好。我已经用$ echo $？检查了进程状态？它是0表示成功。

有趣的是，这两个命令可以正常工作:

$ which rails
/usr/local/bin/rails

$ rails -v
Rails 4.1.0

这是一个Amazon Web Services AMI镜像64位。请帮我解决这个问题。

我安装了 bundle 器:

$ gem install bundler
Fetching: bundler-1.6.2.gem (100%)
Successfully installed bundler-1.6.2
Parsing documentation for bundler-1.6.2
Installing ri documentation for bundler-1.6.2
Done installing documentation for bundler after 5 seconds
1 gem installed

我检查了重复的安装:

$ find / 2>/dev/null| grep bin/ruby
/usr/bin/ruby
/usr/bin/ruby2.0

$ find / 2>/dev/null| grep bin/rails
/usr/local/share/ruby/gems/2.0/gems/railties-4.1.0/bin/rails
/usr/local/share/ruby/gems/2.0/gems/railties-4.1.0/lib/rails/generators/rails/plugin/templates/bin/rails.tt
/usr/local/share/ruby/gems/2.0/gems/railties-4.1.0/lib/rails/generators/rails/app/templates/bin/rails
/usr/local/share/ruby/gems/2.0/gems/rails-4.1.0/guides/code/getting_started/bin/rails
/usr/local/bin/rails
/home/ec2-user/.gem/ruby/2.0/gems/rails-4.1.0/guides/code/getting_started/bin/rails

Answer 1

您将需要安装io-console gem。使用以下命令安装它:

gem install io-console

在此之后运行 rails -h
另外，运行 echo $PATH并确保路径中包含 /usr/local/bin。如果没有，那么您需要添加它。