To add to ikegami's reply, the parent could exit before the child gets a look-in, and that would (probably) send a SIGHUP to the child and kill it. You should consider a wait or waitpid in the parent before it exits (or maybe IGNORE SIGHUP).

In reply to Re^2: using system and exec in same script using child by cdarke
in thread using system and exec in same script using child by convenientstore

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