From: Brian Candler <b.candler@...>
Date: 2009-02-26T03:01:59+09:00
Subject: Re: Can Ruby interact with the shell sh ?

Adam Gardner wrote:
> See, this is what I was referring to when I said a program other than 
> the shell. You're using the shell here, but you almost certainly don't 
> need to be. The program whose output you actually care about if not 
> /bin/sh, but /usr/local/bin/vpnclient
> 
> So, you could change your code in this way:
> 
> IO.popen("/usr/local/bin/vpnclient connect xxxxx user xxxxxxx pwd 
> xxxxxxxxxx","r+") do |s|

Aside: as far as a I remember, IO.popen invokes a shell anyway and 
passes that command to it.

With Kernel#system there is a multi-arg version which bypasses the 
shell:

  system("/usr/local/bin/vpnclient","connect",xxxx, ... etc)

I don't think you can do this with IO.open - but you can with open3 (see 
open3.rb in the standard library)
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