rodgers@maxwell.mmwb.ucsf.edu (R. P. C. Rodgers, M.D.) (06/03/91)
Dear Fellow Netlanders, Reading the manual pages concerned with rsh and experimentation thus far fail to show how rsh can be made to exit with the status of the command it is executing on a remote host (if indeed this is possible...). The rsh always seems to exit with a status of 0, even if the command on the remote hosts fails. Thanks in advance for any pointers/solutions. Cheerio, Rick Rodgers R. P. C. Rodgers, M.D. (415)476-2957 (work) 664-0560 (home) UCSF Laurel Heights Campus UUCP: ...ucbvax.berkeley.edu!cca.ucsf.edu!rodgers 3333 California St., Suite 102 Internet: rodgers@maxwell.mmwb.ucsf.edu San Francisco CA 94118 USA BITNET: rodgers@ucsfcca
Tom Christiansen <tchrist@convex.COM> (06/03/91)
From the keyboard of rodgers@maxwell.mmwb.ucsf.edu (R. P. C. Rodgers, M.D.):
:Reading the manual pages concerned with rsh and experimentation thus
:far fail to show how rsh can be made to exit with the status of the command
:it is executing on a remote host (if indeed this is possible...).
:The rsh always seems to exit with a status of 0, even if the command on the
:remote hosts fails.
rsh will exit !0 if it fails to make the connection, or loses it,
or whatnot. I use maarten Litmaath's "ersh" front end [enclosed]
when I want an rsh that gives me the remote status.
--tom
#!/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>&-
--
Tom Christiansen tchrist@convex.com convex!tchrist
"Perl is to sed as C is to assembly language." -memjm@eleazar.dartmouth.edu (Andy Behrens) (06/04/91)
rodgers@maxwell.mmwb.ucsf.edu (R. P. C. Rodgers, M.D.) writes: >The rsh always seems to exit with a status of 0, even if the command > on the remote hosts fails. This question gets asked fairly often. Here's a replacement for rsh that you should install on the local machine. The remote machine doesn't need to be changed provided you are running a fairly "normal" shell. Thanks to Maarten Litmaath for this little gem. ------------------------------ CUT HERE ------------------------------ #!/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). RSH=/usr/ucb/rsh RLOGIN=/usr/ucb/rlogin 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 $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 $RSH "$hostname" $lflag ${user+"$user"} $nflag \ "(${*-:}); sh -c '"'echo "$0 $1" >&2'\'' $?0 "$status"' \ 2>&1 >&3 3>&- | awk "$AWK" >&2 3>&- --------------------------- END OF SCRIPT ---------------------------