1 SIGNAL 2 labelname 2? VALUE 2.1 expression 2 OFF 2.1 ERROR 2.1 FAILURE 2.1 HALT 2.1 NOVALUE 2.1 SYNTAX 2 ON 2.1 ERROR 2.1 FAILURE 2.1 HALT 2.1 NOVALUE 2.1 SYNTAX 2.2? NAME trapname 3 ;