Kevin Jackson wrote:
>> Actually, I am not sure how this would work.  If I do this, I get no 
>> output from the file:
>>
>> `tail -f sim.out`
>>
>> So there is something basic I am missing here.  Any help?
> 
> it shells out to the process and waits for it to return - with -f does
> tail ever return? if not you may not be able to use it - AFAIK ` and
> exec are the same - someone with better ruby knowledge may be able to
> offer a solution - perhaps using threads or something
Use IO.popen:

IO.popen('tail -f sim.out'){|f|
	while line = f.gets
		p line
	end
}

-- 
Alex