From: shasckaw <shasckaw@...>
Date: 2004-01-28T08:14:54+09:00
Subject: Re: checksum with ruby, how?

Mike Stok wrote:

> In article <40168bd4$0$322$ba620e4c@news.skynet.be>,
> shasckaw  <shasckaw@skynet.be> wrote:
> 
>>Hello there, I need help.
>>I'm searching for checksum funtionality to use with ruby,
>>it seems that I have all I need with digest/md5 but I can't find any 
>>documentation about how to use it (searched on ruby-doc and RAA)
>>
>>Can someone help me?
> 
> To set a baseline, I used md5sum to checksum "hello there\n"
> 
> [mike@won mike]$ echo "hello there" > test.txt
> [mike@won mike]$ md5sum test.txt
> 2d01d5d9c24034d54fe4fba0ede5182d  test.txt
> 
> I used irb and some guesswork to figure out its methods, the guess being
> that Digest::MD5 was the right package:
Your guesswork has really been instructive in itself. Thanks a lot.

> [snip]
> It seems that you can initialise it with any String, so
>>>File.open('/etc/passwd') do |f|
>?>    puts Digest::MD5.new(f.read).hexdigest
>>>end
> f087dea38c54a8b40d3dbc8b0becfb4c
> => nil
This is exactly what I needed.

>or
>>>d3 = Digest::MD5.new
> => d41d8cd98f00b204e9800998ecf8427e
>>>File.new('/etc/passwd').each_line { |l| d3 << l }
> => #<File:/etc/passwd>
>>>d3.hexdigest
> => "f087dea38c54a8b40d3dbc8b0becfb4c"
> 
> are reasonable ways to checksum a file (at least on linux where I don't
> care about binary mkode...)
I'm using ruby on winNT. I've tested the code above and it gives exactly 
the same result, work fine then! :)

> Hope this helps,
This helped me a lot, thanks. And thanks to all other too.

> Mike
Lio