On 04/14/2012 11:20 PM, Amadeus W.M. wrote:
> For the sake of the argument, assume I echo 500 As, 500 Bs and 500 Cs.
>
> I don't care which process the output is coming from. It doesn't matter
> which order the As, Bs and Cs are output. All I care about is that I
> don't get 349As followed by 245Bs, etc. I want to see blocks of 500 each.
>
> I don't see how echoing into a pipe would change the problem.
> Theoretically, if several processes (e.g. echo) are running in the
> background, e.g. on a round robin basis, then potentially I could see
> random sequences of As, Bs and Cs. It doesn't seem to be the case in
> practice though. So which is it?
>
> This has to do with the operating system internals, it's not a trivial
> question.
Why don't you test it and see that it does make a difference?
[egreshko@meimei test]$ ./io.sh > out
[egreshko@meimei test]$ grep ^A out | wc
98 98 588
[egreshko@meimei test]$ mkfifo pipe
[egreshko@meimei test]$ ./io.sh > pipe
[egreshko@meimei test]$ cat pipe | grep ^A | wc
100 100 600
--
Never be afraid to laugh at yourself, after all, you could be missing out on the joke
of the century. -- Dame Edna Everage
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