Shell Programming and Scripting

Main.ksh
dbscript.ksh
echo $?  #it is returning zero even though error is there in dbscript.ksh

echo "Start Timestamp is : "$datevar1 > log.out;
db2 "export to $exportfilepath/abc.ixf of IXF
select * from table with UR" #Here I am selecting from various tables and conditions
datevar=`date +'%F-%H.%M.%S'`
echo "Current Timestamp is : "$datevar >>  log.out;
echo "The value of $?" # Here also it is returning 0
if [[ $? -ne 0 && $? -ne 2 ]]; then
        echo "Run Status is : Fail"
else
        echo "Run Status is : Success" 
fi

db2 . . .
EXIT_DB2=$?
select . . .
EXIT_SEL=$?

db2 "export to $exportfilepath/abc.ixf of IXF select * from table with UR" #Here I am selecting from various tables and conditions.There is an error and it is working fine
if [[ $? -ne 0 ]]; then
        echo "Run Status is : Fail"
else
        echo "Run Status is : Success" 
fi

dbscript.ksh
if [ $? -ne 0 ];
then 
echo "dbscript.ksh got failed` 
else 
echo "dbscript.ksh got succeed"
fi