With exec, the new non-perl program simply takes over the calling process and runs under its pid. If the new program forks again, you could get trouble, but that's the new program's responsibility. You need to know its behavior to use it effectively.

After Compline,
Zaxo

In reply to Re^3: Executing a process in the background AND getting its pid by Zaxo
in thread Executing a process in the background AND getting its pid by henrikbe

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