Shell Programming and Scripting

Hi Guys,
I am working on a shell script(main script) where in i have to call another script B and pass parameter to that script. I see that the shell script that is being called in the main script is throwing warnings/fatal errors. So i am just wondering how do i capture these and ask the script to exit when there are any warnings/fatal errors.
FYI...i am calling this script B three times in the main script...once for retrieving (parameter 1)the data, then for update(paramter 2) and then for storing(paramter 3) the data. If there are warnings/errors in any of these steps, they should be captured and the script should exit instead of going further.

Thanks in advance!!

The simplest way is to catch the exit code of script B.
Put this line in your 'main' script just after you call script B

Code:

#Main Script
./scriptB
EXIT_CODE=`echo $?`
if [ $EXIT_CODE -ne 0 ]
then
    echo "Script B did not execute successfully. Exiting..."
    exit 1
fi