From: Xavier Noria <fxn@...>
Date: 2007-11-06T10:08:19+09:00
Subject: Re: Line ending problem.

On Nov 6, 2007, at 1:42 AM, Cong Chan wrote:

> I am writing a ruby script to insert some content into the beginning  
> of
> some files.
>
> The files would be used in Windows or Mac, when I use File.puts method
> to write the file, it changes the line ending of the file.
>
> Any way to let ruby keep the previous line-ending of the file?

Not automatically.

If you know before hand that the line-ending convention is uniform you  
can open the file in binary mode, pick a few bytes, and look for the  
first line separator (=~ /\015?\012/).

Then write in binary mode and set $\ to that capture, aka the ouput  
record separator. Use print instead of puts, since puts does not check  
$\ but prints "\n" unconditionally.

-- fxn