Issue with "rsh" on RedHat Post: 303028612

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Top Forums UNIX for Advanced & Expert Users Issue with "rsh" on RedHat Post 303028612 by bakunin on Friday 11th of January 2019 05:21:39 AM

01-11-2019

Registered User

Quote:

Originally Posted by gull04

It all hangs and you have to "ctrl C" to break out, but by doing;

Code:

[root@fbakirmsir1 autodoc]#  rsh -l autoupd 10.3.100.95
Last login: Thu Jan 10 14:20:32 from fbakirmsir1
$ uname -s
SunOS
$ uname -a
SunOS isd250 5.10 Generic_150400-46 sun4v sparc sun4v
$ exit
rlogin: connection closed.
[root@fbakirmsir1 autodoc]#

So, if i get that right: rsh hangs until you press CTRL-C when called from a script (?) but works when issued manually, from the commandline.

First suspicion is that there is a difference in the environment of the script and your interactive enivronment, so how about dumping the respective environments (via an inserted set > /some/file) and cast a diff on them? Also - as this will not be shown by this method - check for eventual aliases and the like. This is basically the same idea as Don Cragun had, but generalised to other settings than PATH.

Or - you will have to test that - does it always not work for the first time and work for the second (and subsequent) time(s)? Such behavior usually results from something being loaded/configured "on demand" but not completely being able to fulfill the current sessions request - the current session will fail but any subsequent session will work. (Sorry for being so vague but i don't know your system well enough to come up with any more concrete ideas).

I hope this helps.

bakunin

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LEARN ABOUT DEBIAN

netkit-rsh

RSH(1)							    BSD General Commands Manual 						    RSH(1)

NAME

     rsh -- remote shell

SYNOPSIS

     rsh [-Kdnx] [-k realm] [-l username] host [command]

DESCRIPTION

     Rsh executes command on host.

     Rsh copies its standard input to the remote command, the standard output of the remote command to its standard output, and the standard error
     of the remote command to its standard error.  Interrupt, quit and terminate signals are propagated to the remote command; rsh normally termi-
     nates when the remote command does.  The options are as follows:

     -K    The -K option turns off all Kerberos authentication.

     -d    The -d option turns on socket debugging (using setsockopt(2)) on the TCP sockets used for communication with the remote host.

     -l    By default, the remote username is the same as the local username.  The -l option allows the remote name to be specified.  Kerberos
	   authentication is used, and authorization is determined as in rlogin(1).

     -n    The -n option redirects input from the special device /dev/null (see the BUGS section of this manual page).

     If no command is specified, you will be logged in on the remote host using rlogin(1).

     Shell metacharacters which are not quoted are interpreted on local machine, while quoted metacharacters are interpreted on the remote
     machine.  For example, the command

	   rsh otherhost cat remotefile >> localfile

     appends the remote file remotefile to the local file localfile, while

	   rsh otherhost cat remotefile ">>" other_remotefile

     appends remotefile to other_remotefile.

FILES

     /etc/hosts

SEE ALSO

     rlogin(1), kerberos(3), krb_sendauth(3), krb_realmofhost(3)

HISTORY

     The rsh command appeared in 4.2BSD.

BUGS

     If you are using csh(1) and put a rsh in the background without redirecting its input away from the terminal, it will block even if no reads
     are posted by the remote command.	If no input is desired you should redirect the input of rsh to /dev/null using the -n option.

     You cannot run an interactive command (like rogue(6) or vi(1)) using rsh; use rlogin(1) instead.

     Stop signals stop the local rsh process only; this is arguably wrong, but currently hard to fix for reasons too complicated to explain here.

Linux NetKit (0.17)						  August 15, 1999					       Linux NetKit (0.17)