# Running ruby app with instant rails

**URL:** <https://www.ruby-forum.com/t/running-ruby-app-with-instant-rails/133589>\
**Category:** Rails\
**Created:** [April 1, 2008, 10:50pm UTC](https://www.ruby-forum.com/t/running-ruby-app-with-instant-rails/133589 "2008-04-01T22:50:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![spiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/f07891/32.png) [@spiz](https://www.ruby-forum.com/u/spiz)\
**Post date:** [April 1, 2008, 10:50pm UTC](https://www.ruby-forum.com/t/running-ruby-app-with-instant-rails/133589/1 "2008-04-01T22:50:14Z")

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Hi, I am new to ruby and using instant rails to run a simple app I  
wrote. The application is not recognized as a ruby app. Even when I  
open it up with the rails console, it asks what program to open it with.  
How do I associate .rb files with ruby?

Thanks…

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<div class="post-metadata">

**Author:** ![spiz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/f07891/32.png) [@spiz](https://www.ruby-forum.com/u/spiz)\
**Post date:** [April 2, 2008, 1:02am UTC](https://www.ruby-forum.com/t/running-ruby-app-with-instant-rails/133589/2 "2008-04-02T01:02:58Z")

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Steve Layman wrote:

> Hi, I am new to ruby and using instant rails to run a simple app I  
> wrote. The application is not recognized as a ruby app. Even when I  
> open it up with the rails console, it asks what program to open it with.  
> How do I associate .rb files with ruby?
> 
> Thanks…

You need to type “ruby filename.rb” to run your ruby scripts. Also,  
when you double-click a .rb file, it should ask you to choose a program.  
Browse for the Ruby interpreter and check “always use this”.