From: Max Muermann <ruby@...>
Date: 2006-08-23T07:03:47+09:00
Subject: Re: file compare and remove lines

bad = []
File.read("small.txt").each { |line| bad << line.to_i }
good = File.new("good.txt","w");
File.read("big.txt").each do |line|
      id = line.split('\t')[0].to_i
      good << line unless bad.delete(id)
end
good.close

I'm sure there's a better way, but this took only two minutes to write.
Max

On 8/23/06, Matt Coffman <matt@binarybrain.net> wrote:
> Here is my issue:
>
> I have two files - call them big.txt and small.txt.  My goal is to have
> a list file and remove any lines in the big file that exist.
>
> Big.txt is a tab del file with the following info
>
> 11     Fred Flinestone     Bedrock,Il
> 12     Wilma Flinestone    Bedroc, Il
>
>
> small.txt is a tab del file  - following information
> 12
> 23
> 32
> 23
>
>
> I would like to scan big.txt against small.txt to get a final file
> good.txt - with the following
>
> 11     Fred Flinestone     Bedrock,Il
>
>
>
> regards,
>
> matt
>
> --
> Posted via http://www.ruby-forum.com/.
>
>