function error_check
{
#       ----------------------------------------------------------------
#       Function for exit due to fatal program error
#               Accepts 1 argument:
#                       string containing descriptive error message
#               If notify is set to true, it sends an email alert
#               If the second argument is "exit", the function exits on an error
#
#       Use the following after each command you want to check for errors:
#               error_check "$LINENO: <message>" <exit>
#
#       ----------------------------------------------------------------
        if [ $? = "0" ]; then   #There was no error
                echo "`date +%F_%H-%M-%S`: ${SCRIPT} line $1 succeeded" >> $logfile 2>&1
        else    #there was an error
                        message="`date +%F_%H-%M-%S`: ${SCRIPT} line ${1:-"Unknown Error"} failed"
                        echo $message >> $logfile 2>&1

                        if [ "$2" = "exit" ]; then
                                emailSubject="`hostname` FATAL ERROR: DO NOT connect and start Hybris until this problem is corrected"
                        else
                                emailSubject="`hostname` non-fatal error: refresh continued. Please investigate ASAP"
                        fi

                        if [ "$notify" = "true" ]; then
                                echo "$message on `hostname`" | mail -s "$emailSubject" $email
                        fi
                        if [ "$2" = "exit" ]; then     #if the second argument is "exit", then stop execution
                                exit 1
                        fi
        fi
}