From: Brian Candler <b.candler@...>
Date: 2010-09-20T21:40:27+09:00
Subject: Re: File.open(path, "wb")

Abder-Rahman Ali wrote:
> At: http://www.tutorialspoint.com/ruby-on-rails/rails-file-uploading.htm
> 
> And, in:
> 
> File.open(path, "wb")
> 
> What is meant by "wb"?

Your first port of call should be the documentation. Go to:

http://ruby-doc.org/core/

and in the top right pane select open(IO). This is because File is a 
subclass of IO and inherits the open method - admittedly this is not 
clear to a newcomer. Then scroll to the top of the page to see a list of 
all the mode strings.

Or, at the command prompt, just type "ri IO"
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