Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!uunet!auspex!guy
From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.questions
Subject: Re: How does a shell know if it's in the foreground or the background?
Message-ID: <7454@auspex.auspex.com>
Date: 26 Apr 91 18:28:26 GMT
References: <1991Apr24.232959.6247@elroy.jpl.nasa.gov> <aza3YoWOdiVTo@idunno.Princeton.EDU>
Organization: Auspex Systems, Santa Clara
Lines: 7

>In shells that support job control (like csh), jobs are put into different 
>process group than the parent shell to facilitate job control.

Note also that, in shells that support job control, "foreground" and
"background" are temporary conditions, not ways of life; a job could be
in the foreground one minute, and in the background a bit later, and
then back in the foreground again a bit later....