./simpleif [ $? -eq 1 ] ; then 	echo "ERROR" 	exit 1 fi./simple_threadsif [ $? -eq 1 ] ; then        echo "ERROR"        exit 1fi./simple_processesif [ $? -eq 1 ] ; then        echo "ERROR"        exit 1fi./simple_mutexif [ $? -eq 1 ] ; then        echo "ERROR"        exit 1fi