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* ruby [#bcbf3723]

- RubyからPDFを生成 - prawnを使って
-- http://qiita.com/sawamur@github/items/865ed68323b07061e4f5
 $ sudo apt-get install rubygems
 $ sudo apt-get install rubygems1.9
 yoya@sakura:~$ gem 'prawn'
 ERROR:  While executing gem ... (RuntimeError)
     Unknown command praw
 yoya@sakura:~$ gem1.9.1  'prawn'
 ERROR:  While executing gem ... (RuntimeError)
     Unknown command prawn
 yoya@sakura:~$ gem1.8  'prawn'
 ERROR:  While executing gem ... (RuntimeError)
     Unknown command prawn

 $ sudo apt-get install rails
 $ sudo apt-get install   libsinatra-ruby