From: Adam Bender <abender@...>
Date: 2009-05-02T08:49:02+09:00
Subject: Re: Read and re-write file with one open?

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On Fri, May 1, 2009 at 4:33 PM, James Dinkel <jdinkel@gmail.com> wrote:

> That's pretty close to how I've been modifying files:
>
>  File.open(filename, 'r+') do |file|
>    lines = file.readlines
>
>    # modify data in the lines array
>
>    file.pos = 0
>    file.print lines # will not put \$ between array elements
>    file.truncate(file.pos)
>  end
>
> This opens a file for reading and writing, reads the file into an array,
> then you modify the array how you need to.  Then the block returns to
> the beginning of the file, writes out your changes over the existing
> file, then chops off what's left.  Then, of course, the file is closed
> when the block exits.
>

This is exactly what I wanted.  Thanks everyone.

Adam

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