You are running in a pipe, it is not supposed to wait for the process to finish. The program runs in background, waiting for you to write something to the file handle $R. Use system if you want to wait for it to complete.

Or maybe I mis-read your question?

In reply to Re: Execution of external process does not wait in IIS7/Windows by cdarke
in thread Execution of external process does not wait in IIS7/Windows by lintunen

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