After forking, we still have to wait/waitpid for the child process to end in order to avoid zombies, unless we employ the double-fork technique.

Instead, try this: system "perl B.pl &"; system "perl C.pl &"

Reference: How do I start a process in the background?

In reply to Re^2: How to call two programs simultaneously from a running program by repellent
in thread How to call two programs simultaneously from a running program by ccmbvipin

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