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Path: utzoo!hcrvax!ecrhub!ecr2!peterc
From: peterc@ecr2.UUCP (Peter Curran)
Newsgroups: net.unix
Subject: Re: Setting variables for a running process
Message-ID: <129@ecr2.UUCP>
Date: Mon, 27-May-85 05:16:52 EDT
Article-I.D.: ecr2.129
Posted: Mon May 27 05:16:52 1985
Date-Received: Wed, 29-May-85 07:25:46 EDT
References: <10893@brl-tgr.ARPA>
Organization: Emerald City Research Inc., Toronto
Lines: 22

Here is a scheme for getting environment changes back to your "main"
shell (this works for /bin/sh.  I presume masochists could find
something similar in csh):

Add the following three lines to your .profile file:

trap '. $SHCMDS; rm -f $SHCMDS' 8
SHCMDS=$HOME/shcmds  SHPID=$$
export SHCMDS SHPID

Then, in suprocess, write shell commands into the file named in $SHCMDS,
and send signal 8 to the process identified by $SHPID.  For example,
in a shell script

echo "TERM=$TERM; export TERM" >$SHCMDS
signal -8 $SHPID

It is probably preferably that the '>' be '>>' to allow several
commands to be written out at once.  This will fail if you push
it too hard - the shell has to get time to execute the commands
before another command is issued.  However, it can be used for
all sorts of tricks.