From: timr <timrandg@...>
Date: 2009-05-02T04:00:12+09:00
Subject: Re: Read and re-write file with one open?

On Apr 29, 9:27 pm, Adam Bender <aben...@gmail.com> wrote:
> [Note:  parts of this message were removed to make it a legal post.]
>
> I would like to write a Ruby script that opens a text file, performs a gsub
> on each line, and then overwrites the file with the updated contents.  Right
> now I open the file twice: once to read and once to write.  The reason for
> this is that if I try to perform both operations on the same IO object by
> calling io.rewind and writing from the beginning, and the substituted word
> is shorter than what it is replacing, some portion of the end of the
> original file remains.  Is there an idiom for "clearing" the contents of the
> file before writing?
>
> Thanks,
>
> Adam