topic Re: script problem in Operating System - HP-UX

script problem

Mark Cater_2 — Mon, 08 Nov 2004 06:24:25 GMT

I have the following script:
#!/bin/ksh
while read UNIX_Q NT_server NT_Q
do
for hostbox in $(cat /.netrc|grep root |awk '{print $2}')
do echo $hostbox
rexec $hostbox "usr/cbin/lpshut"
rexec $hostbox "/usr/sbin/lpadmin -p$UNIX_Q -v/dev/null -mrmodel -orm$NT_server -o
rp$NT_Q -ocmrcmodel -osmrsmodel -ob3"
rexec $hostbox "/usr/sbin/lpsched"
rexec $hostbox "/usr/bin/enable $UNIX_Q"
rexec $hostbox "/usr/sbin/accept $UNIX_Q"
done
done < printers.txt

It only runs once. If i comment out the rexec and add some echo's it works ok. The rexec is the problem.
Does anyone have any ideas how to resolve this?

Re: script problem

Bharat Katkar — Mon, 08 Nov 2004 06:33:04 GMT

Hi,
Check the follwoing entry in inetd.conf. If it is commented then uncomment it and rerun the inetd daemon.

exec stream tcp6 nowait root /usr/lbin/rexecd rexecd

Use "# /usr/sbin/inetd -c" to make inetd daemon reread the configuration file.

Hope that helps.
Regards,

Re: script problem

Mark Cater_2 — Mon, 08 Nov 2004 06:39:46 GMT

thanks for reply but its already uncommented.

Re: script problem

Bharat Katkar — Mon, 08 Nov 2004 06:53:23 GMT

HI,
Did u configured .rhosts or /etc/hosts.equiv file properly.
See Man .rhosts and hosts.equiv.
Regards,

Re: script problem

RAC_1 — Mon, 08 Nov 2004 07:08:28 GMT

rexec does not use .rhosts or /etc/hosts.equiv files. It uses .netrc file in user's home directory.

man netrc for details. set it up and it should work. Also use you rexec as follows for clarity and ease of management.

rexec "host" -l "user_name" -n "command" Also your second rexec will not work, because, there is no way on lpadmin on remote host to know what is UNIX_Q. What you will have to do is somehow put details about UNIX_Q into a file on remote hots and use it from there.

Anil

Re: script problem

Bharat Katkar — Mon, 08 Nov 2004 07:15:38 GMT

sorry mark..
RAC is right, rexec uses .netrc for user authentication and remsh uses rhosts or host.equiv file....

Re: script problem

Mark Cater_2 — Mon, 08 Nov 2004 07:23:09 GMT

thansk for replies. I might have made an error with copy and paste.
The script works - lp, etc all works. the problem is that rexec will only run the for loop once.
comment the rexec and it all works fine.
So rexec must send an exit signal for the for loop???

Re: script problem

Bharat Katkar — Mon, 08 Nov 2004 07:27:44 GMT

I think using remsh instead of rexec will solve your problem.
Regards,

Re: script problem (rexec/remsh in loop)

Dennis Handly — Mon, 16 Jan 2012 03:29:23 GMT

>the problem is that rexec will only run the for loop once.

As mentioned in the fine print of RAC's reply, you need to use -n, otherwise rexec/remsh/ssh, will eat up the stdin that is driving the for-loop or while loop.

Re: script problem

Bill Hassell — Mon, 16 Jan 2012 15:22:03 GMT

You need to trace the script's actions since you didn't supply any messages that come from the script. After the the first line, add the line:

set -x

Now each step of the script will be shown and you can see what each step is doing.

Re: script problem

Riccardo_Marini — Wed, 18 Jan 2012 16:03:42 GMT

Your problem seems an "exit" gived by "rexec" directly on the ksh process

You should try to replace every line of rexec with this:

rc=`rexec etc etc.. `

In this way "rexec" will be executed by another process

Best Regards

Re: script problem (rexec/remsh in loop)

Dennis Handly — Thu, 19 Jan 2012 01:54:02 GMT

>You need to trace the script's actions since you didn't supply any messages that come from the script. ...

>Your problem seems an "exit" given by "rexec" directly on the ksh process ...

You guys didn't believe me when I said the problem was with missing -n? ;-)

That's the whole reason I replied to this old thread, nobody explicitly mention why -n would fix it.