From: benjohn@...
Date: 2007-02-22T19:05:06+09:00
Subject: Re: ruby tail

> 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
> }

Out of interest, the blocking call is "gets" here, right? Can you use
Kernel.select on a bunch of those handles?

Cheers,
  Benj


>
> --
> Alex
>
>