# ERb on he command line re: Ruby For Rails book **URL:** \ **Category:** Rails\ **Created:** [April 27, 2006, 5:07am UTC](https://www.ruby-forum.com/t/erb-on-he-command-line-re-ruby-for-rails-book/58918 "2006-04-27T05:07:04Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![ptremblett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/dc4da7/32.png) [@ptremblett](https://www.ruby-forum.com/u/ptremblett)\ **Post date:** [April 27, 2006, 5:07am UTC](https://www.ruby-forum.com/t/erb-on-he-command-line-re-ruby-for-rails-book/58918/1 "2006-04-27T05:07:04Z")
Hi, I am working thru the Ruby for rails book. On page 30 David Black talks about running erb from the command line i.e. $ erb erbdemo.rb just as you would a normal ruby prog ($ ruby erbdemo.rb) but when I try to do this I get command not found. How do I make this work? I am running Linux (Ubuntu Breezy) Regards, Paul ---
**Author:** ![ptremblett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/dc4da7/32.png) [@ptremblett](https://www.ruby-forum.com/u/ptremblett)\ **Post date:** [April 27, 2006, 2:44pm UTC](https://www.ruby-forum.com/t/erb-on-he-command-line-re-ruby-for-rails-book/58918/2 "2006-04-27T14:44:08Z")
Hi – On Thu, 27 Apr 2006, Paul Jonathan T. wrote: > Hi, > > I am working thru the Ruby for rails book. On page 30 David Black > talks about running erb from the command line i.e. $ erb erbdemo.rb > just as you would a normal ruby prog ($ ruby erbdemo.rb) but when I > try to do this I get command not found. How do I make this work? I am > running Linux (Ubuntu Breezy) It might depend how you installed Ruby. Is it possible that Ubuntu bundles erb separately in a different package? David – David A. Black (removed\_email\_address@domain.invalid) Ruby Power and Light, LLC ([http://www.rubypowerandlight.com](http://www.rubypowerandlight.com)) “Ruby for Rails” PDF now on sale! [Ruby for Rails](http://www.manning.com/black) Paper version coming in early May! ---
**Author:** ![ptremblett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/dc4da7/32.png) [@ptremblett](https://www.ruby-forum.com/u/ptremblett)\ **Post date:** [April 27, 2006, 7:30pm UTC](https://www.ruby-forum.com/t/erb-on-he-command-line-re-ruby-for-rails-book/58918/3 "2006-04-27T19:30:07Z")
for what it’s worth, I think Ezra Zyg. (he who does not sleep) was building a Rails-specific Ubuntu called Rubuntu. – Giles B. [http://www.gilesgoatboy.org](http://www.gilesgoatboy.org) ---
**Author:** ![ptremblett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/dc4da7/32.png) [@ptremblett](https://www.ruby-forum.com/u/ptremblett)\ **Post date:** [April 28, 2006, 2:17am UTC](https://www.ruby-forum.com/t/erb-on-he-command-line-re-ruby-for-rails-book/58918/4 "2006-04-28T02:17:16Z")
David, I am getting this when I attempt to run the code from CH 2 of your book. Can you advise please? Loading development environment. > > class MainController \< ApplicationController ?\> def welcome > > @composers = Composer.find(:all).sort\_by {|c| [c.last\_name, > > c.first\_name] }\>\> end > > > end > > NameError: uninitialized constant ApplicationController > > from > > /usr/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active\_support/dependencies.rb:200:in > > `const\_missing’ > > from (irb):1 > > > Regards, Paul ---
**Author:** ![ptremblett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/dc4da7/32.png) [@ptremblett](https://www.ruby-forum.com/u/ptremblett)\ **Post date:** [April 28, 2006, 9:20pm UTC](https://www.ruby-forum.com/t/erb-on-he-command-line-re-ruby-for-rails-book/58918/5 "2006-04-28T21:20:07Z")
Hi – On Fri, 28 Apr 2006, Paul Jonathan T. wrote: > c.first\_name] }\>\> end > > > > end > > > NameError: uninitialized constant ApplicationController > > > from > > > /usr/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active\_support/dependencies.rb:200:in > > > `const\_missing’ > > > from (irb):1 I’m really not sure what could be behind that other than for some reason the application\_controller.rb file being missing on your system, or maybe some kind of very obscure version mismatch in the Rails setup. Is application\_controller.rb there? David P.S. I’m in London at the moment and not as constantly online as I usually am, but will be checking in at least periodically. > > Rails mailing list > > removed\_email\_address@domain.invalid > > [http://lists.rubyonrails.org/mailman/listinfo/rails](http://lists.rubyonrails.org/mailman/listinfo/rails) > > * * * > > Rails mailing list > removed\_email\_address@domain.invalid > [http://lists.rubyonrails.org/mailman/listinfo/rails](http://lists.rubyonrails.org/mailman/listinfo/rails) – David A. Black (removed\_email\_address@domain.invalid) Ruby Power and Light, LLC ([http://www.rubypowerandlight.com](http://www.rubypowerandlight.com)) “Ruby for Rails” PDF now on sale! [Ruby for Rails](http://www.manning.com/black) Paper version coming in early May! ---
**Author:** ![ptremblett](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/dc4da7/32.png) [@ptremblett](https://www.ruby-forum.com/u/ptremblett)\ **Post date:** [May 3, 2006, 7:10pm UTC](https://www.ruby-forum.com/t/erb-on-he-command-line-re-ruby-for-rails-book/58918/6 "2006-05-03T19:10:46Z")
Hi David, Thank you for your efforts. I am in Auckland, New Zealand so we are a 180 deg out of sinc. I sorted out the problem by starting the exercise again and things came right. So it was most likely finger problems. On a new context, if you can spare a moment I need to achieve the following and I do not have much time to do it in (Unfortunately I have only just discovered your book and I am working from the pdf while I await the hard copy which I ordered on Friday). I have two tables and they have a one to many relationship I want to display the contents in a browser. Parent with its children beneath it. How do I do this. I am a rails (and Ruby nuby, as you already know) so am pretty ignorant. Sorry to be making such a nuisance of my self. Regards, Paul