From: Ammar Ali <ammarabuali@...>
Date: 2010-01-20T18:38:37+09:00
Subject: Re: help on a script

Ruby Newbee wrote:
> Hi,
>
> I just wrote a small script to find the files in current directory and
> its child directories which include the word "ruby".
> But it can't work, please help point out my error, thanks.
>
>
> def myfind(path=".")
>     Dir.foreach(path) do |f|
>         if File.file? f
>             open(f) do |c|
>                 puts "#{path}/#{f}" if c.read.scan(/ruby/)
>             end
>         elsif File.directory? f
>             newpath = File.join path,f
>             myfind(newpath)
>         end
>     end
> end
>
> myfind
>
>
>   

Hi,

Walking the directory recursively can be done with 'glob', or it's 
equivalent method '[]'. The following will recursively find all files 
that have a '.rb' extension, starting from the current directory.

Dir['**/*.rb'].each { |path| puts path }

The scan method returns an array of matches, or takes a block which can 
act on that array. To check if any matches where found, one can check 
that the returned array is not empty, for example:

  puts path if c.read.scan(/ruby/).length > 0



ammar