From: Adam Gardner <adam.oddfellow@...>
Date: 2009-02-26T02:46:28+09:00
Subject: Re: Can Ruby interact with the shell sh ?

Raimon Fs wrote:
> Thanks to all,
> 
> It's working now ...
> 
> I'm aware of the dead-lock or unknow things, I'm experimenting with it.
> 
> This is because I have to upload some files to an ftp server, but I must 
> do it trgough a VPN connection.
> 
> I want to start this VPN connection manually, and once connected, fire 
> all the file upload.
> 
> Thanks, I'm sure I'll have lots of new questions, but now I can go 
> further ...
> 
> thanks again!
> 
> regards,
> 
> r.
> 
> 
> IO.popen("/bin/sh","r+") do |s|
> 
>   s.puts "/usr/local/bin/vpnclient connect xxxxxx user xxxxxx pwd 
> xxxxxxxx\n"
> 
>   while line = s.gets do
>       puts " ** #{line}"
>       if line =~ %r{y/n}
>           s.puts 'y'
>       end
>   end
> 
> end

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|

  while line = s.gets do
      puts " ** #{line}"
      if line =~ %r{y/n}
          s.puts 'y'
      end
  end

end


I don't have the vpnclient program on my machine, so I can't test it, 
but it should work exactly the same. Or, if my code is not exactly 
correct, I hope at least I've conveyed the idea clearly.

Incidentally, there is a command line tool called 'yes' that will help 
you accomplish what you want as well.

system("yes | /usr/local/bin/vpnclient connect xxxxx user xxxxxxx pwd 
xxxxxxxxxx")

Of course, that only helps with the immediate situation where the only 
interactivity is answering y/n questions and you want to answer all of 
them 'y', but it where you can use it, it's a lot simpler.
-- 
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