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From: maart@cs.vu.nl (Maarten Litmaath)
Newsgroups: comp.unix.programmer,alt.sources
Subject: ersh - rsh frontend hack returning exit status of remote cmd
Keywords: improved version
Message-ID: <8877@star.cs.vu.nl>
Date: 30 Jan 91 00:26:48 GMT
Sender: news@cs.vu.nl
Reply-To: maart@cs.vu.nl (Maarten Litmaath)
Followup-To: comp.unix.programmer
Organization: VU Dept. of Computer Science, Amsterdam, The Netherlands
Lines: 70

#!/bin/sh
# @(#)ersh 2.4 91/01/30 Maarten Litmaath
# This rsh front-end returns the exit status of the remote command.
# It works OK with sh/csh-compatible shells on the remote (!) side.
# If there is no remote command present, /usr/ucb/rlogin is invoked.
# Usage: see rsh(1).

unset hostname lflag nflag user

case $1 in
-l)
	;;
*)
	hostname=$1
	shift
esac

case $1 in
-l)
	lflag=-l
	user=$2
	shift 2
esac

case $1 in
-n)
	nflag=-n
	shift
esac

case $hostname in
'')
	hostname=$1
	shift
esac

case $# in
0)
	exec /usr/ucb/rlogin $lflag ${user+"$user"} "$hostname"
esac

AWK='
	NR > 1 {
		print prev;
		prev = $0;
		prev1 = $1;
		prev2 = $2;
	}
	NR == 1 {
		prev = $0;
		prev1 = $1;
		prev2 = $2;
	}
	END {
		if (prev1 ~ /[0-9]*[0-9]0/)
			exit(prev1 / 10);
		if (prev1 == "0")
			exit(prev2);
		print prev;
		exit(1);
	}
'

exec 3>&1

/usr/ucb/rsh "$hostname" $lflag ${user+"$user"} $nflag \
	"(${*-:}); sh -c '"'echo "$0 $1" >&2'\'' $?0 "$status"' \
	2>&1 >&3 3>&- | awk "$AWK" >&2 3>&-
--
Temporary files like /tmp/sh$$ are an abomination.