1# $FreeBSD$ 2 3case ! in 4[\!!]) ;; 5*) echo Failed at $LINENO ;; 6esac 7 8case ! in 9['!'!]) ;; 10*) echo Failed at $LINENO ;; 11esac 12 13case ! in 14["!"!]) ;; 15*) echo Failed at $LINENO ;; 16esac 17