NO way to know without the code, but since you say 'fork' in the title, my guess is that you are failing to
exit; in the child processes. Without this, all the proccess complete from where the fork happened executing all the rest of the porgram, hence 'command 5' happens more than you expect.
The fact that I've made that mistake, oh, 10 or 15 times, also leads me to that suspicion.
--Bob Niederman, http://bob-n.com
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