json - How do you use ruby gems after they have been installed on OS X -

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i able install json library using ruby gems. in case it's relevant, i'm using latest os x.

usr$ sudo gem install json password: building native extensions.  take while... installed json-1.6.5 1 gem installed installing ri documentation json-1.6.5... installing rdoc documentation json-1.6.5...

however, attempting require 'json' doesn't work. doing wrong?

touakas-macbook-pro:tmp jacob$ ruby x.rb x.rb:3:in `require': no such file load -- json (loaderror)     x.rb:2

the x.rb follows:

#!/usr/bin/env ruby require 'json'  x = { "a"=>"b" } print x.to_json

you need load rubygems first:

require 'rubygems' require 'json'

edit:

according comment below, you'd better use ruby -rubygems x.rb rather require rubygems directly (suppose you're writing module resue).

credit to: @injekt , @ingenu


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