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KSH problem - how do i redirect three times?

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# 1  
Old 09-30-2008
KSH problem - how do i redirect three times?
i need to output an ls command to a file but also capture any errors from that command and output them to a log file and the screen.

if it's only possible to output them to a log file and not the screen then that's fine.

this is what i've tried so far, but it won't populate log.txt. i've purposefully added a directory (scripts) that doesn't exist to force the ls command to fail.

Code:
ls -lR  > scripts/release_file.txt 2>&1 | tee -a log.txt

i suspect it's the first redirection that's causing the problem as the command usually works if i'm not outputting the ls results to another file.
# 2  
Old 09-30-2008
how about
Code:
cat /dev/null >log.txt; ls -lR scripts/release_file.txt >log.txt 2>&1 ; cat log.txt

the cat /dev/null >log.txt will empty the log file, then the ls is run, and the results (including any errors) are sent to log.txt, then the results are output to the screen.
# 3  
Old 09-30-2008
Code:
cat /dev/null >log.txt; ls -lR scripts/release_file.txt >log.txt 2>&1 ; cat log.txt

the problem is, the command is part of a much larger script that outputs lots of info to the log file.

therefore, we can't empty the log file at the start...

Code:
cat /dev/null >log.txt;

or cat the log file at the end...

Code:
cat log.txt

...because of all the stuff that is already in the log file from previous commands executed in the script.
# 4  
Old 09-30-2008
Quote:
Originally Posted by mjays
i need to output an ls command to a file but also capture any errors from that command and output them to a log file and the screen.

if it's only possible to output them to a log file and not the screen then that's fine.

this is what i've tried so far, but it won't populate log.txt. i've purposefully added a directory (scripts) that doesn't exist to force the ls command to fail.

Code:
ls -lR  > scripts/release_file.txt 2>&1 | tee -a log.txt

i suspect it's the first redirection that's causing the problem as the command usually works if i'm not outputting the ls results to another file.

You were close...
Code:
$ ls data notthere
ls: notthere: No such file or directory
data
$ ls data not_there 2>&1 >stdout | tee stderr
ls: not_there: No such file or directory
$ cat stdout
data
$ cat stderr
ls: not_there: No such file or directory
$

# 5  
Old 09-30-2008
Hi

If your question is to redirect the output/err to file/errr-file

This will serve the purpose

Code:
cat local.csh 1>errt.txt 2>err.txt; cat err.txt

Hope i got your question right.

Regards,
Harsha
# 6  
Old 09-30-2008
Quote:
Originally Posted by Perderabo
You were close...
Code:
$ ls data notthere
ls: notthere: No such file or directory
data
$ ls data not_there 2>&1 >stdout | tee stderr
ls: not_there: No such file or directory
$ cat stdout
data
$ cat stderr
ls: not_there: No such file or directory
$

that's it, you've cracked it.

thanks for your help, and thank you everyone else.

p.s harshakirans - your solution didn't work, i kept getting - cat: cannot open err.txt. thanks though.
# 7  
Old 09-30-2008
sorry but i was a little premature.

things still aren't right.

the problem is, i need the script to exit if the ls command fails, but all it does is display the error and then write to the log file.

this is the ls command and the code after it

Code:
ls -lR ${BUILD_CODE} 2>&1 >${REL_FILES}/${RELNO}.txt | tee -a ${LOGFILE}
if [ $? -ne 0 ]
   then
       exit
fi

so you see, the tee command is probably successful which gives me a $status of 0.

how do i interogate the error from the ls command when it's tucked in way back there?
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