From: Thomas Dutch <rubyforum@...>
Date: 2005-12-19T03:02:40+09:00
Subject: Re: Removing parts from a file

Harpo wrote:
> Thomas Dutch wrote:
> 
>> Hello,
>> 
>> I'm relatively new to Ruby and I have a question:
>> 
>> Is it possible to remove one or more lines from a file, without
>> reading the whole file and writing it away again? This because I'll
>> have to do this with files of 1 gigabyte and larger... Is there a high
>> performance solution for this?
>> 
>> Thank you!
> 
> Said like this, i don't think it is possible as it is not related to the
> language but to the file structure.
> It depends on the programs which read the file, can they be fixed to
> accept lines which begin with somethinq that says 'skip me', such as a
> '#' ?

No not really... It's a large amount of text, all under eachother. 
Another file contains an index where a part of the file starts and where 
it ends. The code should remove a part that starts at the position 
specified in the second file, and the ends at the other position 
specified.

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