off topic: combined output of concurrent processes

"Amadeus W.M." <amadeus84@xxxxxxxxxxx> · Sat, 14 Apr 2012 01:35:38 +0000 (UTC)

This is not Fedora specific, so apologies for posting it here. I used to 
post this kind of questions in comp.linux.misc or the like but I don't 
have access to usenet groups anymore.

So here is the question. Suppose I have several processes that run 
concurrently and each outputs stuff to stdout. Can the combined output be 
intermingled? 

Example: script ioTest.sh:

#!/bin/bash

i=0
while [ $i -lt 100 ];
do
    echo "AAAAA" &    # e.g. 500 As
    echo "BBBBB" & 
    echo "CCCCC" & 

    i=$(($i+1))
done

Then 

./ioTest.sh > out

The A's and B's and C's always seem to be in contiguous blocks of 500 in 
the output file, but is that guaranteed? 

Thanks!

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