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

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

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

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]#

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.

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.