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wait: mention PID must be a child of this shell

From: Dan Jacobson
Subject: wait: mention PID must be a child of this shell
Date: Wed, 22 Jun 2005 02:57:52 +0800 
$ help wait
doesn't mention that PID must be a child of this shell.
Nor does it advise how to wait if PID is not a child of this shell.

User wanted to do
   noffle --f &
   (wait $!; noffle -f) &
for better or worse.

User forced to use
   (noffle -f; noffle -f)&
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