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From: brandon@tdi2.UUCP (Brandon Allbery)
Newsgroups: net.sources
Subject: Re: Prompt Wars
Message-ID: <338@tdi2.UUCP>
Date: Mon, 13-Apr-87 14:07:18 EST
Article-I.D.: tdi2.338
Posted: Mon Apr 13 14:07:18 1987
Date-Received: Tue, 21-Apr-87 03:47:05 EST
References: <5983@dartvax.UUCP>
Reply-To: brandon@tdi2.UUCP (Brandon Allbery)
Followup-To: net.sources
Distribution: world
Organization: Tridelta Industries, Inc., Mentor, Ohio
Lines: 117

Don't you think this is getting a bit ridiculous?  BTW, here's mine, for a
csh such as Xenix and System III/V resellers like to include:  (change paths
as necessary)

-------------------------------------------------------------------------------
if ("`/usr/plx/printenv CSHLEVEL`" == "") then
	setenv CSHLEVEL 1
	setenv CSHTYPE ""
	set cwd=(`/bin/pwd`)
else if ($?prompt) then
	@ level=$CSHLEVEL + 1
	setenv CSHLEVEL $level
	set uid=`/appl/u32/bin/uid`		# well, it's easiest
	if ($uid == 0) then
		set w=\#
	else
		set w=\%
	endif
	if ( "$CSHTYPE" == "" ) then
		set prompt="${level}${w} "
	else
		set prompt="$CSHTYPE@${level}${w} "
	endif
	unset level w
	set cwd=(`/bin/pwd`)
endif
-------------------------------------------------------------------------------

Change the reference to the "uid" program; I used to use "id" through a sed
command, but I have to admit that the above is faster...  (u32 == UNIFY 3.2)

This works with the following, which is VERY useful (dunno how useful if you
have sxt's or job control; we have neither) for preserving environments:

-------------------------------------------------------------------------------
#! /bin/sh
#
# Generate a new environment and run a subshell with it.  $1 names the
# environment file to be used.
#

[ $# -gt 1 ] && {
	echo "usage: $0 [environment]" >&2
	exit 1
}
[ $# -eq 0 ] && exec ${SHELL:-/bin/sh}
envspec="$HOME/.pushenv/$1"
[ -f "$envspec" ] || {
	echo "$0: Unknown environment." >&2
	exit 1
}
env | fgrep "PATH
HOME
TERM
TZ
CSHLEVEL
CSHTYPE
EDITOR
LOGNAME
MAIL
SHELL" | fgrep -v "`sed -n '/^!/s///p' < $envspec`" > /tmp/env.$$
env | fgrep "`sed -n '/^=/s///p' < $envspec`" >> /tmp/env.$$
ed - /tmp/env.$$ << eof
g/=/s/=\(.*\)$/='\1'/
w
q
eof
sed -f /u/brandon/.pushenv/.push.sed < $envspec >> /tmp/env.$$
# cat /tmp/env.$$
env="`sed -n '/^cd/!s/=.*//p' < /tmp/env.$$`"
unset `env | sed -n '/^PATH=/!s/=.*//p'`
. /tmp/en[vw].$$
export $env
/bin/rm -f /tmp/env.$$
# echo '---'
# exec env
exec ${SHELL:-/bin/sh}
-------------------------------------------------------------------------------

This is used with files in ~/.pushenv containing lines of the following form:

-------------------------------------------------------------------------------
#
# Environment for UNICOE
#

@UNICOE				# ID to put in prompt

$UNIFY = /appl/u32/lib		# set some useful environment variables
$BUDEV = /dev/rrm/0m
$DBPATH = /coesys/bin
$UUID = 0
$UUACL = 15
$DATETP = US
$PATH = $DBPATH:$UNIFY/../bin:$PATH
$EDIT = $EDITOR

>$DBPATH			# and change directory
-------------------------------------------------------------------------------

By default a small set of environment variables is retained and the rest are
junked, so you can start out "clean" on each "push".  (I also alias "pop" to
"exit".)

RV and the like in the prompt?  Well, there's always "tput" under System V.

Hopefully this article has a little more useful "meat" than the previous ones.
(Of course, ``meat'' is relative; we don't use hostnames (1 machine), I don't
want the current directory in my prompt and dislike flashing lights except to
flag disasters.)

++Brando
-- 
Brandon S. Allbery	           UUCP: cbatt!cwruecmp!ncoast!tdi2!brandon
Tridelta Industries, Inc.         CSNET: ncoast!allbery@Case
7350 Corporate Blvd.	       INTERNET: ncoast!allbery%Case.CSNET@relay.CS.NET
Mentor, Ohio 44060		  PHONE: +1 216 255 1080 (home +1 216 974 9210)