From: brabuhr@...
Date: 2010-07-10T04:19:45+09:00
Subject: Re: FIRST PROGRAMMING PROBLEM Array

On Fri, Jul 9, 2010 at 1:44 PM, Francisco Martinez <calabazag@hotmail.es> wrote:
> f=File.open(txtFile)
> f.each do |line|
>  if(line=~/\t(.+)/)
>   puts("token= #{$1}")
> end
> f.close

Instead of opening and closing a file, you can pass a block to open
and the file will automatically be closed:

File.open(file) do |f|
  #...
end

http://blog.rubybestpractices.com/posts/rklemme/001-Using_blocks_for_Robustness.html

You might also want to look into methods like 'foreach' and 'readlines'.