A simple script to remove specified text from all files in a directory tree

remove_offending.rb

#!/usr/bin/env ruby
#
# A simple script to remove specified text from all files in a directory tree
# remove_offending.rb <target_dir>
# bad string - <iframe src="http://odmarco.com/arwe/?736361acd09ca9717c9462514beb5205" width=0 height=0 style="hidden" frameborder=0 marginheight=0 marginwidth=0 scrolling=no></iframe>

require 'fileutils'
include FileUtils::Verbose


@offending_line = /<iframe.+http:\/\/odmarco.com.+\/iframe>/
@@count = 0

root_dir = ARGV[0]
  
def clean(file_name)
  return if File.directory?(file_name)
  
  replica = file_name + ".cleaning"

  FileUtils.mv(file_name, replica)
  puts "cleaning #{file_name}..."
  
  File.open(file_name, "w") do |out|
    IO.foreach(replica) do |line|
    
      if line =~ @offending_line
        puts "FOUND - #{line}"
        line.gsub!(@offending_line, "")
        puts "CLEAN - #{line}"  
        @@count = @@count + 1
      end
  
      out << line    
    end
    
  end

  FileUtils.rm(replica, :force => true)
end
  
def traverse(dir)
  puts "Looking in #{dir}"
  entries = Dir.entries(dir)
  puts "#{entries.size} files or directories ..."

  for entry in entries
    rel_path = File.join(dir, entry)
    if entry == "." or entry == ".."
      next
    elsif File.directory?(rel_path)
      traverse(rel_path)
    else
      begin
        clean(rel_path)      
      rescue StandardError => boom
        puts "couldn't open #{entry}, #{boom.to_s}"
      end
    end
  end
end


traverse(root_dir)
FileUtils.rm_rf("*.cleaning")

puts "Finished. Cleaned #{@@count} occurrences."