finish. From the docs:
timeout
Optional
0
Length of time, in seconds, that ColdFusion waits for output from the
spawned program.
* 0: equivalent to non-blocking mode.
* A very high value: equivalent to blocking mode
If the value is 0:
* ColdFusion starts a process and returns immediately. ColdFusion may
return control to the calling page before any program output displays. To
ensure that program output displays, set the value to 2 or higher.
* If the outputFile attribute is not specified, any program output is
discarded
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