From: Daniel N <has.sox@...>
Date: 2006-10-13T15:42:04+09:00
Subject: Re: Large File Reading and Writing

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Thanx.  I'm not sure that my head is really around it though...

Pls see inline

On 10/13/06, Joel VanderWerf <vjoel@path.berkeley.edu> wrote:

>
> Something like this maybe...
>
> history = []
> ARGF.each do |line|
>    history << line
>    if enough_history_to_generate_some_output
>      write_output
>      history.clear
>    end
> end


Does the output file not stay in memory?  In my case the output file is
almost a concatenation of large files so once I've written a line I don't
really want to keep that line in memory.

The ARGF thingy is explained in 'ri IO':
>
>       The global constant ARGF (also accessible as $<) provides an
>       IO-like stream which allows access to all files mentioned on the
>       command line (or STDIN if no files are mentioned). ARGF provides
>       the methods #path and #filename to access the name of the file
>       currently being read.
>
> You can of course open a file by name from your code.



If I have a named file and I open it.  I think it will be easier if I open
specify the files from withing ruby by feeding it only a directory.  Once I
have my list of files if I open a file

File.open( "my_file", "r" )

Is there a way to buffer this input so that the entire file is not read?

Sorry if this is implicit in your last reply but I don't understand it if it
is.

Cheers

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