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Old 10-16-2014, 05:28 AM   #1
anand1
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Registered: Oct 2014
Posts: 2

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Smile ambiguous redirect


Hi Friends,

I am a beginner to shell script.I have run the shell script in tcsh shell.

In my shell script code,I am trying to redirect output to a file.
But getting ambiguous redirect

Code:
su -c "exit" - prime310 > pnoutput.txt 2>&1
2>&1 redirect stdout and stderr to pnoutput.txt.(correct me if i am wrong)

I also tried in bash shell. but same ambiguous redirect error came.

I have searched in Google. but not able to
find clear solution.

Please help me to resolve this issue.


Regards,
Anand

Last edited by anand1; 10-16-2014 at 07:32 AM. Reason: explaining issue little bit more
 
Old 10-16-2014, 06:14 AM   #2
pan64
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Registered: Mar 2012
Location: Hungary
Distribution: debian/ubuntu/suse ...
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would be nice to see more, that looks not enough to find the reason.
please use [code]here comes your code[/code] to keep formatting.
You can put set -xv at the beginning of your script to see what's happening
 
Old 10-17-2014, 04:55 AM   #3
mithun119
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Registered: Aug 2014
Posts: 16

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Hi Anand,

TCSH stdout/stderr redirection happens in a different way.

BASH:
[root@vmtest02 lab]# su -c "date" kummit01 > /tmp/mitx 2>&1
[root@vmtest02 lab]# cat /tmp/mitx
Fri Oct 17 04:44:51 CDT 2014


TCSH:
STDOUT redirection:
[root@vmtest02 lab]# su -c "date" kummit01 >& /tmp/mitx
[root@vmtest02 lab]# cat /tmp/mitx
Fri Oct 17 04:52:12 CDT 2014

STDERR redirection:
[root@vmtest02 lab]# su -c "dat" kummit01 > & /tmp/mitx
[root@vmtest02 lab]# cat /tmp/mitx
bash: dat: command not found
[root@vmtest02 lab]#
 
Old 10-27-2014, 07:42 AM   #4
anand1
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Registered: Oct 2014
Posts: 2

Original Poster
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Hi Mithun,

Thanks for the reply.

After your suggestion, I have modified the code as below in the sh file.(I am using TCSH shell).

<code>
su -c "exit" - prime310 >& /export/home/prime310/pnoutput.txt
cat pnoutput.txt
</code>

and ran the sh file as
sh filename.sh
i.e
<code>
sh pn_failure_detection.sh
</code>

but sh file is not execute successfully and the shell got struck. I forcefully stop the shell buy pressing ctrl+x.
 
Old 10-27-2014, 07:58 AM   #5
mithun119
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Registered: Aug 2014
Posts: 16

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This part of your command is perfectly fine. It works as desired on bash or tcsh.
su -c "exit" - prime310 >& /export/home/prime310/pnoutput.txt && cat pnoutput.txt --> in ideal case is not expected to give any output if the id exists

See eg. below for stdout and stderr redirected to the output file.
[root@vmtest02 lab]# su -c "exit" - test1 >& /tmp/test.^Ct
[root@vmtest02 lab]# cat /tmp/test.out
[root@vmtest02 lab]# su -c "exit" - test123 >& /tmp/test.out
[root@vmtest02 lab]# cat /tmp/test.out
su: user test123 does not exist


What else is going into your <code> sections needs to be scrutinized. What exactly are you trying to achieve. We require more info to tell you why your script slipped into loops.
 
  


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