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Full Discussion: Remote commands fail for tcsh user
Top Forums UNIX for Advanced & Expert Users Remote commands fail for tcsh user Post 302459349 by sszd on Monday 4th of October 2010 12:24:16 PM
Old 10-04-2010
Remote commands fail for tcsh user
I'm more familiar with bash/ksh that csh/tcsh. With that said, I recently ran across a problem with tcsh.

Our system admin recently installed purify on our solaris 8 system. In order to use purify you have to execute a Rational script in order to setup the paths and some environment variables correctly. Since we only have a single license for purify, our admin setup the license for a single "common" user account that the developers could use. This common user account happens to be defined to use tcsh as its default login shell.

Our system admin went on to add a 'source' command to the .tcshrc login file for this common user so the Rational script would automatically get executed upon logging in.

At this point everything seems to work just fine. However, it was later discovered that commands from a remote host to the user of the host upon which purify was installed no longer work. Commands like ssh, scp, and rsync.

After a bunch of experimenting, I was able to track this problem down to some output statements (in particular, 'echo') within the Rational script. An example would be... let's say you execute an scp command on a remote host to copy some files from the user on the system for which purify was setup. You actually see the output from the echo commands within the Rational script, but then scp will finish without performing the copy.

Instead of modifying the third party Rational script, I decided to mess around with the .tcshrc login file. Since I'm not that familiar with the tcsh shell, the first thing I tried was to simply redirect the output of the sourced Rational script a multitude of different ways, none of which worked. Here's an example of one attempt.

source /Rational/purifyplus_setup.csh > /dev/null

Eventually I stumbled across a solution by checking the TERM environment variable prior to executing the Rational script. The script will only execute if TERM exists.

This brings me to my questions...

1. Why would output statements cause remote commands to fail?

2. Why does redirecting the output not work? In fact, redirecting the output did absolutely nothing. You still see the output.

3. Is there a better solution than checking the TERM environment variable? I don't know if doing such a check will cause some other login or remote login senario to fail.
 

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LEARN ABOUT SUNOS

setusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

       /bin/bash		  /bin/csh
       /bin/jsh 		  /bin/ksh
       /bin/pfcsh		  /bin/pfksh
       /bin/pfsh		  /bin/sh
       /bin/tcsh		  /bin/zsh
       /sbin/jsh		  /sbin/pfsh
       /sbin/sh 		  /usr/bin/bash
       /usr/bin/csh		  /usr/bin/jsh
       /usr/bin/ksh		  /usr/bin/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/bin/zsh		  /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)
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