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Need output of script on screen and file with correct return status of the called script.

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Top Forums Shell Programming and Scripting Need output of script on screen and file with correct return status of the called script.
# 8  
Old 11-13-2014
Quote:
Originally Posted by RudiC
man bash
Thanks.
My bash version is:
Code:
$ echo $BASH_VERSION
3.00.15(1)-release

---------- Post updated at 07:06 PM ---------- Previous update was at 06:58 PM ----------

Quote:
Originally Posted by sea
You can set the return code to a variable so you can reuse it at any later time again.

Example - 1.sh
Code:
#!/bin/bash
echo "I'm script: $0" | tee -a ./1.log
[[ $UID -eq 34567 ]]
RET=$?
echo "The exit code was $RET, and now it can be re-used"
echo "Returned: $RET" | tee -a ./1.log

echo "Cat'ing:"
cat 1.log

Output:
Code:
sh 1.sh 
I'm script: 1.sh
The exit code was 1, and now it can be re-used
Returned: 1
Cat'ing:
I'm script: 1.sh
Returned: 1

Hope this helps
Thanks for your reply.
I am calling child script from parent script and I want to capture the exit status of the child script into main script. Can I store exit status of child script in variable and use it in parent script?

I know that, we can export variable from parent script and use its value in child script but does it work other way?
# 9  
Old 11-13-2014
That case is about the same:
Code:
sh 2.sh
RET=$?

Or likewise:
Code:
sh 2.sh
RET2=$?

sh 3.sh
RET3=$?

or even:
Code:
for script in 2.sh 3.sh;do
    sh $script
    RET=$?
    echo "$script returned: $RET" | tee -a $script.log
    echo "$script returned: $RET" | tee -a allscripts.log
done

Quote:
Can I store exit status of child script in variable and use it in parent script?
Not unless you export the variable, in which case, they must not have the same name, or you can just fetch the latest 'output/export'.
However, you could read the logfile for sure.

hth
Last edited by sea; 11-13-2014 at 09:57 AM..
# 10  
Old 11-13-2014
Quote:
Originally Posted by sea
That case is about the same:
Code:
sh 2.sh
RET=$?

Or likewise:
Code:
sh 2.sh
RET2=$?

sh 3.sh
RET3=$?

or even:
Code:
for script in 2.sh 3.sh;do
    sh $script
    RET=$?
    echo "$script returned: $RET" | tee -a $script.log
    echo "$script returned: $RET" | tee -a allscripts.log
done


Not unless you export the variable, in which case, they must not have the same name, or you can just fetch the latest 'output/export'.
However, you could read the logfile for sure.

hth
I want to catch the output of the $script in log file (both stdout and stderr). How can I do that?

If I use tee command to capture both stdout and stderr like below, I loose the exit status.
Code:
sh $script 2>&1 | tee -a $script.log

Last edited by Prathmesh; 11-13-2014 at 10:12 AM.. Reason: included code to explain myself better
# 11  
Old 11-13-2014
I wrote a database backup script where I have exec in the script redirecting stdout and stderr in the script to a log file. Hence, when I run the script I don't see any output. But I can run the script as "nohup ./myscript.sh &" then I just tail -f on the log file to see exactly what it is doing. I tried using tee in the past to split the output, but could not get it working either. Maybe a newer bash version would work fine...
# 12  
Old 11-13-2014
What i ment was:
Code:
...
    sh $script
    RET=$?
    echo "$script returned $RET just fined... regular output to terminal"
    echo "$script returned $RET" >> common.log
    ....
    echo "$script returned: $RET" | tee -a $script.log
    echo "$script returned: $RET" | tee -a allscripts.log
...

Last edited by sea; 11-13-2014 at 11:28 AM..
This User Gave Thanks to sea For This Post:
Prathmesh
# 13  
Old 11-13-2014
Quote:
Originally Posted by sea
What i ment was:
Code:
...
    sh $script
    RET=$?
    echo "$script returned $RET just fined... regular output to terminal"
    echo "$script returned $RET" >> common.log
    ....
    echo "$script returned: $RET" | tee -a $script.log
    echo "$script returned: $RET" | tee -a allscripts.log
...


Thanks.

Suppose we do not have control over the script which we are calling $script in this case. And it has only echo commands and it is not saving output to any file, only displaying output on terminal. But, we need to capture whatever output of echo command it is displaying in the main script (from where we are calling $script ) on screen terminal as well as in the file. Then how can we do it?
# 14  
Old 11-13-2014
Quote:
Originally Posted by gandolf989
I wrote a database backup script where I have exec in the script redirecting stdout and stderr in the script to a log file. Hence, when I run the script I don't see any output. But I can run the script as "nohup ./myscript.sh &" then I just tail -f on the log file to see exactly what it is doing.
This is really the preferred way to do it -- from the outside. Complicated schemes with pipes, tees, and fifos are liable to break down, subject to deadlocks, and can make your script dependent on a terminal: Untrustworthy and not worth the trouble. Even 99% success is not good enough. Putting in pipes also messes up the ordering, increases overhead manyfold, and can screw up your terminal prompt afterwards.

When redirecting it from the outside through tee, since you are using BASH, just check the script's return status in PIPESTATUS:

Code:
$ true | false | true | false
$ echo "${PIPESTATUS[0]} ${PIPESTATUS[1]} ${PIPESTATUS[2]} ${PIPESTATUS[3]}"
0 1 0 1

$

Code:
command 2>&1 | tee -a logfile
if [[ "${PIPESTATUS[0]}" -ne 0 ]]
then
        echo "command had an error"
fi

PIPESTATUS is even updated for a single command, so ${PIPESTATUS[0]} remains safe either way, as long as you're using BASH.
Last edited by Corona688; 11-13-2014 at 12:03 PM..
This User Gave Thanks to Corona688 For This Post:
Prathmesh
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