From: 7stud -- <bbxx789_05ss@...>
Date: 2007-11-10T09:54:18+09:00
Subject: Re: How to edit a file without loading it all into memory

Jonathan Dobbie wrote:
> 7stud -- wrote:
>> Jonathan Dobbie wrote:
>>> The lines are easy to
>>> find with grep, and I'm able to create the new line easily enough, but
>>> how can I do this without holding the entire file into memory?  The
>>> files can be hundreds of megabytes.
>>> 
>> 
>> File.foreach("data.txt") do |line|
>>   #look for something in line
>> end
> 
> Here is what I originally wrote, and what I just tried.  Am I missing 
> something obvious?  The first one duplicates the lines, and the second 
> one does nothing.  (doesn't save the changes)
> 

1) Are you under the impression that every method in ruby has the same 
parameters?

2) When you see an error message, do you just ignore it?

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