Catch exit code in bash shell script

The key variable is $?

Example code :

#!/bin/bash

./execute_some_script.sh

if (( $? == 0 ))

then

    echo "the script in script was executed successfully."

else

    echo "the script in script was failed !"

fi

Also a tip for comparing variable as numeric is " if (( $var op $another_var_or_number )) "