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Date: Sun, 31 May 2009 21:40:13 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Kelly Jones <kelly.terry.jones@gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Waiting for a process to die
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> How do I wait for a specific process to die? I want to do something like:
>
> waitpid 1234&&(echo "done!" | Mail -s "PROC DONE" kelly.terry.jones@gmail.com)

if i understand you correctly:

your_program parameters &
bg_process_number=$!

...something else...

wait $bg_process_number
echo "done!"