From: Jean-Julien Fleck <jeanjulien.fleck@...>
Date: 2010-08-02T23:25:49+09:00
Subject: Re: IO.popen

Hello Roger,

> http://ruby-doc.org/core/classes/IO.html#M002242
>
>>> IO.popen("gocr", "rw")
> ArgumentError: invalid access mode rw

When I want to read and write from the IO.popen'ed command, I use

IO.popen(cmd, "r+")

but I do not remember from which source I found I had to use "r+"
rather than the more expected "rw"

Cheers,

-- 
JJ Fleck
PCSI1 Lycée Kléber