From: Konrad Meyer <konrad@...>
Date: 2007-08-10T18:14:18+09:00
Subject: Re: newbie question: how to seek in a file

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On Friday 10 August 2007 02:06:53 am Lutz Horn wrote:
> Hi,
>=20
> Ak 756 wrote:
> > I want to find a string in a text file, then read some bytes data after
> > the position of this string. Would anybody kindly help to tell me how to
> > do?
>=20
> You could do something like this:
>=20
> File.open("my-file.txt") do |f|
>   i =3D f.read.index(/search/)
>   f.seek(i)
>   puts f.read(10)
> end

At that point though, you've already read the entire contents of the file
into memory (f.read()) so there's no point going back and seeking in the
file when:
  * Seeking from memory should always be faster than from disk
  * You're already ignoring the memory issues for large files
=2D-=20
Konrad Meyer <konrad@tylerc.org> http://konrad.sobertillnoon.com/

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