gistfile1.txt

$ ruby -v
ruby 2.0.0p598 (2014-11-13) [x86_64-linux]
$ irb
irb(main):001:0> require 'json'
=> true
irb(main):002:0> quit

$ bundle exec irb
rirb(main):001:0> require 'json'
LoadError: cannot load such file -- json
	from (irb):1:in `require'
	from (irb):1
	from /usr/bin/irb:12:in `<main>'
irb(main):002:0> RUBY_DESCRIPTION
=> "ruby 2.0.0p598 (2014-11-13) [x86_64-linux]"
irb(main):003:0> require 'rubygems'
=> false
irb(main):004:0> require 'json'
LoadError: cannot load such file -- json
	from (irb):4:in `require'
	from (irb):4
	from /usr/bin/irb:12:in `<main>'
irb(main):005:0> 

gistfile2.txt

$ bundle exec irb
irb(main):001:0> $LOAD_PATH
=> ["/opt/pro/lib", "/opt/sidekiq/lib", "/home/mike/.gem/ruby/gems/redis-3.2.2/lib", "/home/mike/.gem/ruby/gems/connection_pool-2.2.0/lib", "/home/mike/.gem/ruby/gems/concurrent-ruby-1.0.1/lib", "/home/mike/.gem/ruby/gems/algorithms-0.6.1/lib", "/home/mike/.gem/ruby/gems/algorithms-0.6.1/ext", "/opt/ent/lib", "/usr/local/share/gems/gems/bundler-1.10.6/lib", 
"/usr/local/share/ruby/site_ruby", "/usr/local/lib64/ruby/site_ruby", "/usr/share/ruby/vendor_ruby", "/usr/lib64/ruby/vendor_ruby", "/usr/share/rubygems", "/usr/share/ruby", "/usr/lib64/ruby/"]
irb(main):002:0> quit

$ irb
irb(main):001:0> $LOAD_PATH
=> ["/usr/local/share/ruby/site_ruby", "/usr/local/lib64/ruby/site_ruby", "/usr/share/ruby/vendor_ruby", "/usr/lib64/ruby/vendor_ruby", "/usr/share/rubygems", "/usr/share/ruby", "/usr/lib64/ruby/"]
irb(main):002:0> require 'json'
=> true
irb(main):003:0> quit

$ bundle exec irb
irb(main):001:0> require 'json'
LoadError: cannot load such file -- json
	from (irb):1:in `require'
	from (irb):1
	from /usr/bin/irb:12:in `<main>'
irb(main):002:0>