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def rsed_do(fn,s1,s2)
   size = s1.bytesize
   if File.exist?(fn)
      print "exist: #{fn}\n"
      #读写方式打开文件
      f=File.new(fn,'rb+')
      loop do
         c=f.read(size*2)
         #p c
         #搜索s1字符串
         if c.include? s1
            #p c.index s1
            #定位s1
            f.seek(f.pos-size*2+c.index(s1))
            #写入s2
            f.write s2
            #print "#{c}\n write s2 ok.\n"
         end
         f.seek (f.pos - size)
         if File.size(f) <= f.pos + size
            break 
         end
      end
      f.close
   end
end

#s1: 原字符串
#s2: 新字符串
def rsed(s1 = ':DoNotReverseLookup => nil,', s2 = ':DoNotReverseLookup =>true,')
   all = ENV['PATH'].split(/;/) | $:
      #p all
   all.each{|x| 
      x.gsub!(/\//,'\\')
      if x
         x.gsub!(/(.+)\\.+/){$1}
      end
      return unless x
      #p x
      #搜索webrick config.rb
      fn=File.join(x,'/webrick/config.rb')
      rsed_do(fn,s1,s2)
      #fn=File.join(x,'/lib/ruby/1.9.1/webrick/config.rb')
      #rsed_do(fn,s1,s2)
      fn=File.join(x,'/lib/ruby/1.8/webrick/config.rb')
      rsed_do(fn,s1,s2)
   }
end

rsed
sleep 1