Yes, the parent will wait in both cases. Unless you do execute something like command & (unix) or start command (Windows).

fork+exec doesn't wait.
IPC::Open3 doesn't wait.
IPC::Run can do both.
The special syntax system 1, ... in Windows doesn't wait.

In reply to Re^3: help needede in backticks(``) and system function by ikegami
in thread help needede in backticks(``) and system function by uva

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