[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>'
我使用$ gem install rails安装了Ruby on Rails,它也完成了.我用$ echo $检查过程状态？它意味着成功.
有趣的是,这两个命令工作正常:
$ which rails
/usr/local/bin/rails
$ …