how to create a lib file in rails that executes a script file?

Question

I want to create a file my_file.rb inside #{Rails.root}/lib/my_file.rb that executes a script my_script residing in #{Rails.root}/script/my_script. I intend to use it like so:

script/first_script # this first script will call a method in
# lib/my_file.rb that will run the script/my_script file.

How can i create such a lib file that can execute a script? and what is the command to execute a script from a lib file?

Isn't it easier to use script/runner any_file.rb? Why do you need so complex structure? — Victor Moroz
– Victor Moroz, Commented Jun 16, 2011 at 14:25
the script does some tasks, and we usually execute it like so: script/any_file > result.log 2> error.log, and then we manually parse the result.log. we need to rewrite the script so that it runs a lib file, which calls the second script using: script/second_script result.log 2> error.log, and then the lib file can access and parse the result.log and present results. — umar
– umar, Commented Jun 16, 2011 at 14:34
You might need the popen3 approach if you want to do that, as it bypasses the need for intermediate log-files. I've updated my answer. — tadman
– tadman, Commented Jun 16, 2011 at 15:10

tadman · Accepted Answer · 2011-06-16 15:10:04Z

2

If by "execute the script" you mean run it in a separate process, then what you need is the system call.

Update:

You can also use the popen3 method if you want to capture STDOUT and STDERR independently. From the example:

Open3.popen3("#{Rails.root}/script/my_script") do |in, out, err|
  # ...
end

edited Jun 16, 2011 at 15:10

answered Jun 16, 2011 at 14:24

tadman

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rogerdpack · Accepted Answer · 2011-06-16 15:17:20Z

1

here's the list of various options to run a process (in answer to your question, basically you define the method within that lib/xxx.rb, then call that method, and within that method, you run system or what not: http://en.wikibooks.org/wiki/Ruby_Programming/Running_Multiple_Processes

answered Jun 16, 2011 at 15:17

rogerdpack

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