From: Emmanuel Oga <eoga@...>
Date: 2008-07-23T10:55:48+09:00
Subject: Re: Trying to search/replace in a text file.

Documentation : http://www.ruby-doc.org/core-1.8.6/classes/IO.html

contents = File.read("filename") #read
contents.gsub!("what you look for", "the substitutive") # modify
File.open("filename", "rw") { |file| file << contents } #write

Warning: File.read will bring the whole file to memory.
-- 
Emmanuel Oga
ELC Technologies (TM)
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