--- loncom/homework/lonmaxima.pm	2007/08/03 20:55:10	1.18
+++ loncom/homework/lonmaxima.pm	2007/08/13 10:21:46	1.20
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Interface routines to MAXIMA CAS
 #
-# $Id: lonmaxima.pm,v 1.18 2007/08/03 20:55:10 riegler Exp $
+# $Id: lonmaxima.pm,v 1.20 2007/08/13 10:21:46 riegler Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -60,9 +60,10 @@ sub maximareply {
 
 sub blacklisted {
     my ($cmd)=@_;
-    foreach my $forbidden ('save','plot','lisp','includ','compil',
+    foreach my $forbidden ('save','load','plot','lisp','includ','compil',
 			   'file','batch','stringout','translat','stout',
-			   'stin','block','system','concat') {
+			   'stin','block','system','concat','read','inchar',
+			   'outchar','ttyoff','with_stdout','writefile') {
 	if ($cmd=~/$forbidden/s) { return 1; }
     } 
     return 0;