Checking exit codes of export utility

Question

Hi all.
I have an Oracle 9.2 db in Solaris and want to do a script to control the status of the exports. I have in the script:
retcode=`echo $?`
case "$retcode" in
0) echo " execution successful" ;;
1) echo " execution exited with failure, see logfile" ;;
*) echo "unknown return code";;
esac
Export has three Exit codes:
A. Successful export/import.
Result : Export terminated successfully without warnings
Import terminated successfully without warnings
Exit Code : EX_SUCC
Exit Level: 0
B. Successful export/import with warnings.
Result : Export terminated successfully with warnings
Import terminated successfully with warnings
Exit Code : EX_OKWARN
Exit Level: 0 (for Unix platforms)
C. Unsuccessful export/import.
Result : Export terminated unsuccessfully
Import terminated unsuccessfully
Exit Code : EX_FAIL
Exit Level: 1 (for Unix platforms, and for Windows platforms with Oracle10g and higher)
I would like to know how to differentiate if the export ended with the EX_OKWARN or EX_SUCC. Because both return the same value.
Regards.

Answer 1

I got the info from Note:281725.1 of metalink. And I suposed that if there are three variables to differentiate the error level could be some way to control it without the need of grep. If the value of EX_OKWARN was different from EX_SUCC would be much easier.
So I'll use grep if there is no other way.