From: El Gato <wmwilson01@...>
Date: 2006-11-23T13:20:48+09:00
Subject: Re: invoke system command from within a method

Moritz Reiter wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi all,
> 
> I am new to Ruby and want to make a Ruby script for the network
> configuration of my notebook as an exercise. Now I encountered a problem
> which is pretty strange to me:
> 
> I want to invoke '/etc/init.d/networking restart' from within my Ruby
> program. If I create a file with the line
> 
> %x{ /etc/init.d/networking restart }
> 
> it works like I would expect. The networking init script gets invoked
> and correctly processed.
> 
> But if I do something like this:
> 
> - -->8--
> class Netconf
> 	def restart
> 		puts %x{ /etc/init.d/networking restart }
> 	end
> end
> 
> netconf = Netconf.new
> netconf.restart
> - --8<--
> 
> I get some output from the init script but it doesn't seem to actually
> do anything. It does not reconfigure my eth's in oppostion to the
> behaviour described above if don't make the system call from within a
> method.
> 
> I would be very glad if anyone could give me a hint or point me to some
> documentation to enlighten me.
> 


Well, 2 things that I'd try, though I have no idea if either will 
actually help.

1) $stdout.sync = true
2) %x{/etc/init.d/networking restart </dev/tty}

Both long-shots, but I can't think of another reason why you'd be having 
a problem.

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