Forking child process, only to run a brief
system command seems pointless, because
system already does a
fork.
To answer your question, simultanious writing to the same file handle by so many child processes probably gets them to clobber each other occasionally.
I would recommend getting rid of the fork entirely - simply put 24 system calls in a loop.
"An undefined problem has an infinite number of solutions." - Robert A. Humphrey
"If you're not part of the solution, you're part of the precipitate." - Henry J. Tillman
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