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Executing multiple child scripts - failing

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# 1  
Old 12-08-2016
Executing multiple child scripts - failing
Hi Folks -

Happy Thursday!

I have a need where I have Parent/Control script that calls multiple child scripts. The problem is, after the first child script is executed, it fails to move to the next script. I assume it's due to my script exit?

For instance, in batch to return to the parent process, you exit with the following command:

Code:
exit /b <insertexitcodehere>

Is there something simlar in shell?

Here is my code:

Code:
source /u01/app/Hyperion_Batch/Scripts/Shell/_env.sh

#::-- Set Script Name --::
_SN=${0##*/}

echo "Script Name: $_SN"
echo "Script Name without EXT: ${_SN%%.sh*}"

#::-- Set Path Variables --::
_MAINPATH=/u01/app/Hyperion_Batch/
_LOGPATH=Logs/
_ERRORPATH=Errors/

#::-- Set Log & Error subdirectory pertaining to specific process --::

_PLOGPATH=LCM_Logs/
_PERRORPATH=LCM_Errors/

#::-- Set Date and Time Variable --::
_DAY=$(date +%d)
_MONTH=$(date +%m)
_YEAR=$(date +%Y)
_DATESTAMP=${_YEAR}${_MONTH}${_DAY}
_HOUR=$(date +%H)
_MINUTE=$(date +%M)
_SECOND=$(date +%S)
_TIME=${_HOUR}${_MINUTE}
_DATETIMESTAMP=${_DATESTAMP}_${_TIME}

#::-- Establish Log and Error File Directories --::
_ARC_LF=${_MAINPATH}${_LOGPATH}${_PLOGPATH}${_YEAR}_${_MONTH}${_DAY}
_ARC_EF=${_MAINPATH}${_ERRORPATH}${_PERRORPATH}${_YEAR}_${_MONTH}${_DAY}
    mkdir -p ${_ARC_LF}
    mkdir -p ${_ARC_EF}

#::-- Prepare File Name Format --::    
_FN=${_TIME}_${_SN%%.sh*}

#::-- Establish standard out and standard error --:: 
_LF=${_ARC_LF}/${_FN}.log
_EF=${_ARC_EF}/${_FN}.err

#::-- Establish LCM Specifics --::

_EPM_SYSTEM_BIN=/u01/app/Oracle/Middleware/user_projects/epmsystem1/bin/
_IMPORTEXPORT_DIR=/u01/app/Oracle/Middleware/user_projects/epmsystem1/import_export/TVeriRep_Automation_Base/
_LCM_DIR=ESB-TVerRep


exec 2>${_EF} > ${_LF}

#:: Begin Script Processing --::
echo ----------------------------------------------------------
echo "Add $LCM_USER & ${LCM_PSWD} to Export XML ..."
echo ----------------------------------------------------------

sed "s/name=\"\" password=\"\"/name=\"${LCM_USER}\" password=\"${LCM_PSWD}\"/" ${_IMPORTEXPORT_DIR}Export.xml > ${_IMPORTEXPORT_DIR}Export1.xml
rm ${_IMPORTEXPORT_DIR}Export.xml
mv ${_IMPORTEXPORT_DIR}Export1.xml ${_IMPORTEXPORT_DIR}Export.xml


echo ---------------------------------------------------------                                                                                                    
echo "Execute ${_LCM_DIR} Life Cycle Management Backup"                                         
echo ---------------------------------------------------------

sh ${_EPM_SYSTEM_BIN}Utility.sh ${_IMPORTEXPORT_DIR}Export.xml

if [ $? -eq 0 ]
then
  echo ---------------------------------------------------------
  echo "${_LCM_DIR} Life Cycle Management Backup Successful"                           
  echo ---------------------------------------------------------
  #::-- If empty, delete YYYY_MMDD error file subdirectory --::
  trap "[ -s ${_EF} ] || rm -f ${_EF} ] && rmdir ${_ARC_EF}" EXIT 0
  
else
  echo ---------------------------------------------------------
  echo "${_LCM_DIR} Life Cycle Management Backup Unsuccessful"                      
  echo ---------------------------------------------------------
  fi
  exit 1

Thanks!
# 2  
Old 12-08-2016
You lost me. I can't see your script running several other scripts - just the one
Code:
sh ${_EPM_SYSTEM_BIN}Utility.sh ${_IMPORTEXPORT_DIR}Export.xml

So - where is the problem?

Two comments on above script:
- putting a trap command AFTER all other commands doesn't guarantee it to be executed if need be.
- that exit 1 will be executed in each and every case independent of the script's result.
# 3  
Old 12-08-2016
Hi Rudi-

Thank you for the note. I'm sorry I wasn't clear.

I have a parent script that calls multiple child scripts and they are setup in the same format as above. The only difference is the directory variable.

My thoughts were my exits were messed up and thus not letting the scrip proceed to the next one.

I was under the impression if return code 0 it would execute the trap command and then exit with a 0 as indicated by EXIT 0 at the end of the trap line.

Thats wrong? Can you explain? Thank you!
# 4  
Old 12-08-2016
trap sets a trap for the entire script and is valid ONLY after it was set - so set it pretty soon. And, please adhere not only to its syntax but to its logics as well - EXIT 0 specifies the sigspec twice, c.f. man bash.
As already said, your script will exit 1 unconditionally - no further scripts will be executed.
# 5  
Old 12-08-2016
Interesting okay. So how would you change the exit portion of the script to exit with 0 unless an error?

looks like I've set all my scripts up this way, darnit.
# 6  
Old 12-08-2016
Put the exit 1 into the else branch. Note though, that no other scripts may be executed if one fails, then.
# 7  
Old 12-08-2016
+1 @RudiC!

When i write complex processing scripts where all sorts of things could go wrong i usually do it this way:

First, a list of commands that have to be executed (in case everything works perfectly). Let us say the list is:

Code:
cmd1 -a -b
cmd2 /bla/foo/bar
cmd3

Then i write the script like this:

Code:
if ! cmd1 -a -b ; then
     echo "Error executing cmd1 -a -b" >2&
     exit 3
fi

if ! cmd2 /bla/foo/bar ; then
     echo "Error executing cmd2 /bla/foo/bar" >2&
     exit 2
fi

if ! cmd3 ; then
     echo "Error executing cmd3"  >2&
     exit 1
fi

exit 0

Notice that the script will exit with a different error code depending on which command the script fails. Also notice that convention in UNIX is that a RC of 0 means "success" and everything else means varying reasons of failure. This is why the fi-construct (usually) works: a command succeeding in what it is suppsed to do will return 0 and therefore if ! cmd... will evaluate to false whereas a command not succeeding will return non-0 and if ! cmd... will return true triggering the then..fi.

I hope this helps.

bakunin
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