off topic: combined output of concurrent processes

[Ed Greshko]

On 04/14/2012 10:09 PM, Dave Ihnat wrote:
> On Sat, Apr 14, 2012 at 09:49:00PM +0800, Ed Greshko wrote:
>> The one problem would be if, as the OP's script is written,
>> backgrounding of processes is done there is no way to control the
>> order of data being written to the pipe.  And, as you pointed out,
>> you may want to write out sequence numbers if that is important.
> Well, it's guaranteed it will be in the order written by each process,
> since the write to the pipe is queued in request order.  I'm
> anal-retentive; the more useful data, the better.  The identifier &
> sequence number gives me more data I can mung, and strip if I don't
> need it.

What I was referring to was the script as written by the OP and which may he executed as

./io.sh > pipe

The script contains multiple "echo &" commands which are not guaranteed to be
executed in order, especially on a multi-CPU system.

-- 
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