script/about
打印出来：
About your application's environment
Ruby version 1.8.5 (i486-linux)
RubyGems version 0.9.4
Rails version 1.2.5
Active Record version 1.15.5
Action Pack version 1.13.5
Action Web Service version 1.2.5
Action Mailer version 1.3.5
Active Support version 1.4.4
Edge Rails revision 547
Application root /home/xxx/project/
Environment development
Database adapter mysql
Database schema version 3
或者：
ruby vendor\rails\railties\bin\rails -v
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