Issue with "rsh" on RedHat Post: 303028618

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Top Forums UNIX for Advanced & Expert Users Issue with "rsh" on RedHat Post 303028618 by Don Cragun on Friday 11th of January 2019 08:52:35 AM

01-11-2019

Registered User

Quote:

Originally Posted by gull04

Hi Don,

The problem isn't on the Solaris (Whole Root Zone) server, all the other Unix servers can execute the command without issue.

This Redhat 7.4 server is the only one on the estate exibiting a problem, the rsh action fails only when a parameter like uname is passed. A simple rsh to the box works fine - I know that this uses rlogin and have been investigating further this morning.

I will spend more time on this today and will go through the earlier posts to check what people have suggested, here's your request;

Code:

isd250# su - autoupd
$
$ printf 'PATH="%s"\npath="%s"\n' "$PATH" "$path"
PATH="/usr/bin::/usr/bin:/usr/ucb:/etc:/usr/sbin:."
path=""
$ grep autoupd /etc/passwd
autoupd:x:26488:1:Autoupdate user:/export/home/autoupd:/usr/bin/rksh
$

Regards

Gull04

Hi Gull04,
I'm glad to hear that you found the problem and got it fixed.

However, note the part of your $PATH setting marked in red above...
First, you don't need /usr/bin in $PATH twice. Having it there twice will only serve to slow down starting up any utility that is not found in /usr/bin or whatever directory you shell assumes is specified by have two <colon>s together in $PATH.

And, maybe more importantly, the standards don't say what happens when you have two <colon>s together in $PATH. The unspecified directory denoted by the two adjacent <colon>s between the first two instances of /usr/bin in your path could be treated as an error (silently ignored but slowing down starting up any utility that is not found in /usr/bin), could be treated as a request to use the current working directory (effectively moving . from the end of your $PATH setting to instead be in second position), or as a request to use / at that position (with the effect varying greatly depending on what is being executed and what utility is being invoked). My (unsupported by any experimentation) guess would be that using / might be the most likely action a shell might take and the most likely to cause hard to track down intermittent anomalies at some point in your future. Any or all of the effects listed above could also vary from shell to shell.

I strongly suggest that you find out what is setting $PATH this way and fix it. I wish you good luck in finding the cause.

Cheers,
Don

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